UNITASK_WEBREQUEST_SUPPORT

Fix using AsyncUnityEventHandler with a already canceled token

.github/workflows/build-debug.yml

@@ -3,16 +3,16 @@ name: Build-Debug
 on:
   push:
     branches:
-      - "**"
+      - "master"
     tags:
       - "!*" # not a tag push
   pull_request:
-    types:
+    branches:
-      - opened
+      - "master"
-      - synchronize
 
 jobs:
   build-dotnet:
+    if: "!(contains(github.event.head_commit.message, '[skip ci]') || contains(github.event.head_commit.message, '[ci skip]'))"
     runs-on: ubuntu-latest
     env:
       DOTNET_CLI_TELEMETRY_OPTOUT: 1
@@ -22,13 +22,14 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-dotnet@v1
         with:
-          dotnet-version: 3.1.101
+          dotnet-version: 3.1.x
       - run: dotnet test -c Debug ./src/UniTask.NetCoreTests/UniTask.NetCoreTests.csproj
 
   build-unity:
+    if: "!(contains(github.event.head_commit.message, '[skip ci]') || contains(github.event.head_commit.message, '[ci skip]')) && ((github.event_name == 'push' && github.repository_owner == 'Cysharp') || startsWith(github.event.pull_request.head.label, 'Cysharp:'))"
     strategy:
       matrix:
-        unity: ['2019.3.9f1', '2020.1.0b5']
+        unity: ["2019.3.9f1", "2020.1.0b5"]
         include:
           - unity: 2019.3.9f1
             license: UNITY_2019_3
@@ -39,15 +40,11 @@ jobs:
       # with linux-il2cpp. image from https://hub.docker.com/r/gableroux/unity3d/tags
       image: gableroux/unity3d:${{ matrix.unity }}-linux-il2cpp
     steps:
-      - run: apt update && apt install git -y
+      # Ubuntu 18.04 git is too old, use ppa latest git.
+      - run: |
+          apt-get update && apt-get install --no-install-recommends -y software-properties-common && add-apt-repository -y ppa:git-core/ppa
+          apt-get update && apt-get install --no-install-recommends -y git
       - uses: actions/checkout@v2
-      # create unity activation file and store to artifacts.
-      - run: /opt/Unity/Editor/Unity -quit -batchmode -nographics -logFile -createManualActivationFile || exit 0
-      - uses: actions/upload-artifact@v1
-        with:
-          name: Unity_v${{ matrix.unity }}.alf
-          path: ./Unity_v${{ matrix.unity }}.alf
-      # activate Unity from manual license file(ulf)
       - run: echo -n "$UNITY_LICENSE" >> .Unity.ulf
         env:
           UNITY_LICENSE: ${{ secrets[matrix.license] }}
@@ -66,8 +63,18 @@ jobs:
         run: /opt/Unity/Editor/Unity -quit -batchmode -nographics -silent-crashes -logFile -projectPath . -executeMethod PackageExporter.Export
         working-directory: src/UniTask
 
-      # Store artifacts.      
+      - name: check all .meta is commited
+        run: |
+          if git ls-files --others --exclude-standard -t | grep --regexp='[.]meta$'; then
+            echo "Detected .meta file generated. Do you forgot commit a .meta file?"
+            exit 1
+          else
+            echo "Great, all .meta files are commited."
+          fi
+        working-directory: src/UniTask
+
+      # Store artifacts.
       - uses: actions/upload-artifact@v2
         with:
           name: UniTask.unitypackage.zip
-          path: ./src/UniTask/*.unitypackage
+          path: ./src/UniTask/*.unitypackage

.github/workflows/build-docs.yml

@@ -0,0 +1,31 @@
+name: build-docs
+
+on:
+  push:
+    branches:
+      - master
+      - feature/docs
+
+jobs:
+  run-docfx:
+    if: "!(contains(github.event.head_commit.message, '[skip ci]') || contains(github.event.head_commit.message, '[ci skip]'))"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2
+        with:
+          repository: Cysharp/DocfxTemplate
+          path: docs/_DocfxTemplate
+      - uses: Kirbyrawr/docfx-action@master
+        name: Docfx metadata
+        with:
+          args: metadata docs/docfx.json
+      - uses: Kirbyrawr/docfx-action@master
+        name: Docfx build
+        with:
+          args: build docs/docfx.json
+      - name: Publish to GitHub Pages
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: docs/_site

.github/workflows/build-release.yml

@@ -1,108 +1,185 @@
-name: Build-Release
+name: build-release
 
 on:
-  push:
+  workflow_dispatch:
-    tags:
+    inputs:
-      - "[0-9]+.[0-9]+.[0-9]+*"
+      tag:
+        description: "tag: git tag you want create. (sample 1.0.0)"
+        required: true
+      dry_run:
+        description: "dry_run: true will never create relase/nuget."
+        required: true
+        default: "false"
+
+env:
+  GIT_TAG: ${{ github.event.inputs.tag }}
+  DRY_RUN: ${{ github.event.inputs.dry_run }}
+  DRY_RUN_BRANCH_PREFIX: "test_release"
+  DOTNET_SDK_VERISON_3: 3.1.x
 
 jobs:
-  build-dotnet:
+  update-packagejson:
     runs-on: ubuntu-latest
+    env:
+      TARGET_FILE: ./src/UniTask/Assets/Plugins/UniTask/package.json
+    outputs:
+      sha: ${{ steps.commit.outputs.sha }}
+    steps:
+      - uses: actions/checkout@v2
+      - name: before
+        run: cat ${{ env.TARGET_FILE}}
+      - name: update package.json to version ${{ env.GIT_TAG }}
+        run: sed -i -e "s/\(\"version\":\) \"\(.*\)\",/\1 \"${{ env.GIT_TAG }}\",/" ${{ env.TARGET_FILE }}
+      - name: after
+        run: cat ${{ env.TARGET_FILE}}
+      - name: Commit files
+        id: commit
+        run: |
+          git config --local user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          git config --local user.name "github-actions[bot]"
+          git commit -m "feat: Update package.json to ${{ env.GIT_TAG }}" -a
+          echo "::set-output name=sha::$(git rev-parse HEAD)"
+      - name: check sha
+        run: echo "SHA ${SHA}"
+        env:
+          SHA: ${{ steps.commit.outputs.sha }}
+      - name: tag
+        run: git tag ${{ env.GIT_TAG }}
+        if: env.DRY_RUN == 'false'
+      - name: Push changes
+        uses: ad-m/github-push-action@master
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          branch: ${{ github.ref }}
+          tags: true
+        if: env.DRY_RUN == 'false'
+      - name: Push changes (dry_run)
+        uses: ad-m/github-push-action@master
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          branch: ${{ env.DRY_RUN_BRANCH_PREFIX }}-${{ env.GIT_TAG }}
+          tags: false
+        if: env.DRY_RUN == 'true'
+
+  build-dotnet:
+    needs: [update-packagejson]
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
     env:
       DOTNET_CLI_TELEMETRY_OPTOUT: 1
       DOTNET_SKIP_FIRST_TIME_EXPERIENCE: 1
       NUGET_XMLDOC_MODE: skip
     steps:
+      - run: echo ${{ needs.update-packagejson.outputs.sha }}
       - uses: actions/checkout@v2
+        with:
+          ref: ${{ needs.update-packagejson.outputs.sha }}
       - uses: actions/setup-dotnet@v1
         with:
-          dotnet-version: 3.1.101
+          dotnet-version: "${{ env.DOTNET_SDK_VERSION_3 }}"
-      # set release tag(*.*.*) to env.GIT_TAG
+      # build and pack
-      - run: echo ::set-env name=GIT_TAG::${GITHUB_REF#refs/tags/}
-
-      # build CommandTools first (use dotnet run command in ZLogger.csproj)
-      - run: dotnet build -c Release ./tools/CommandTools/CommandTools.csproj
       - run: dotnet build -c Release -p:Version=${{ env.GIT_TAG }}
       - run: dotnet test -c Release --no-build
-      - run: dotnet pack ./src/ZLogger/ZLogger.csproj -c Release --no-build -p:Version=${{ env.GIT_TAG }}
+      - run: dotnet pack ./src/UniTask.NetCore/UniTask.NetCore.csproj -c Release --no-build -p:Version=${{ env.GIT_TAG }} -o ./publish
-
       # Store artifacts.
       - uses: actions/upload-artifact@v1
         with:
           name: nuget
-          path: ./src/ZLogger/bin/Release/ZLogger.${{ env.GIT_TAG }}.nupkg
+          path: ./publish/
-      
+
   build-unity:
+    needs: [update-packagejson]
     strategy:
       matrix:
-        unity: ['2019.3.9f1']
+        unity: ["2019.3.9f1"]
         include:
           - unity: 2019.3.9f1
             license: UNITY_2019_3
     runs-on: ubuntu-latest
+    timeout-minutes: 15
     container:
       # with linux-il2cpp. image from https://hub.docker.com/r/gableroux/unity3d/tags
       image: gableroux/unity3d:${{ matrix.unity }}-linux-il2cpp
     steps:
-      - run: apt update && apt install git -y
+      # Ubuntu 18.04 git is too old, use ppa latest git.
+      - run: |
+          apt-get update && apt-get install --no-install-recommends -y software-properties-common && add-apt-repository -y ppa:git-core/ppa
+          apt-get update && apt-get install --no-install-recommends -y git
       - uses: actions/checkout@v2
+        with:
+          ref: ${{ needs.update-packagejson.outputs.sha }}
+      # activate Unity from manual license file(ulf)
       - run: echo -n "$UNITY_LICENSE" >> .Unity.ulf
         env:
           UNITY_LICENSE: ${{ secrets[matrix.license] }}
       - run: /opt/Unity/Editor/Unity -quit -batchmode -nographics -silent-crashes -logFile -manualLicenseFile .Unity.ulf || exit 0
 
-      # set release tag(*.*.*) to env.GIT_TAG
-      - run: echo ::set-env name=GIT_TAG::${GITHUB_REF#refs/tags/}
-
       # Execute scripts: Export Package
       - name: Export unitypackage
         run: /opt/Unity/Editor/Unity -quit -batchmode -nographics -silent-crashes -logFile -projectPath . -executeMethod PackageExporter.Export
-        working-directory: src/ZLogger.Unity
+        working-directory: src/UniTask
-        env:
+
-          UNITY_PACKAGE_VERSION: ${{ env.GIT_TAG }}
+      - name: check all .meta is commited
+        run: |
+          if git ls-files --others --exclude-standard -t | grep --regexp='[.]meta$'; then
+            echo "Detected .meta file generated. Do you forgot commit a .meta file?"
+            exit 1
+          else
+            echo "Great, all .meta files are commited."
+          fi
+        working-directory: src/UniTask
 
       # Store artifacts.
-      - uses: actions/upload-artifact@v1
+      - uses: actions/upload-artifact@v2
         with:
-          name: ZLogger.Unity.${{ env.GIT_TAG }}.unitypackage
+          name: UniTask.${{ env.GIT_TAG }}.unitypackage
-          path: ./src/ZLogger.Unity/ZLogger.Unity.${{ env.GIT_TAG }}.unitypackage
+          path: ./src/UniTask/UniTask.${{ env.GIT_TAG }}.unitypackage
 
   create-release:
-    needs: [build-dotnet, build-unity]
+    if: github.event.inputs.dry_run == 'false'
+    needs: [update-packagejson, build-dotnet, build-unity]
     runs-on: ubuntu-latest
     env:
       DOTNET_CLI_TELEMETRY_OPTOUT: 1
       DOTNET_SKIP_FIRST_TIME_EXPERIENCE: 1
       NUGET_XMLDOC_MODE: skip
     steps:
-    # setup dotnet for nuget push
+      # setup dotnet for nuget push
-    - uses: actions/setup-dotnet@v1
+      - uses: actions/setup-dotnet@v1
-      with:
+        with:
-        dotnet-version: 3.1.101
+          dotnet-version: "${{ env.DOTNET_SDK_VERSION_3 }}"
-    # set release tag(*.*.*) to env.GIT_TAG
+      # Create Releases
-    - run: echo ::set-env name=GIT_TAG::${GITHUB_REF#refs/tags/}
+      - uses: actions/create-release@v1
+        id: create_release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ env.GIT_TAG }}
+          release_name: Ver.${{ env.GIT_TAG }}
+          commitish: ${{ needs.update-packagejson.outputs.sha }}
+          draft: true
+          prerelease: false
+      # Download(All) Artifacts to current directory
+      - uses: actions/download-artifact@v2
+      # Upload to NuGet
+      - run: dotnet nuget push "./nuget/*.nupkg" --skip-duplicate -s https://www.nuget.org/api/v2/package -k ${{ secrets.NUGET_KEY }}
+      # Upload to Releases(unitypackage)
+      - uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }}
+          asset_path: ./UniTask.${{ env.GIT_TAG }}.unitypackage/UniTask.${{ env.GIT_TAG }}.unitypackage
+          asset_name: UniTask.${{ env.GIT_TAG }}.unitypackage
+          asset_content_type: application/octet-stream
 
-    # Create Releases
+  cleanup:
-    - uses: actions/create-release@v1
+    if: github.event.inputs.dry_run == 'true'
-      id: create_release
+    needs: [build-dotnet, build-unity]
-      env:
+    runs-on: ubuntu-latest
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    steps:
-      with:
+      - name: Delete branch
-        tag_name: ${{ github.ref }}
+        uses: dawidd6/action-delete-branch@v3
-        release_name: Ver.${{ github.ref }}
+        with:
-
+          github_token: ${{ github.token }}
-    # Download (All) Artifacts to current directory
+          branches: ${{ env.DRY_RUN_BRANCH_PREFIX }}-${{ env.GIT_TAG }}
-    - uses: actions/download-artifact@v2-preview
-
-    # Upload to NuGet
-    - run: dotnet nuget push "./nuget/*.nupkg" -s https://www.nuget.org/api/v2/package -k ${{ secrets.NUGET_KEY }}
-
-    # Upload to Releases(unitypackage)
-    - uses: actions/upload-release-asset@v1
-      env:
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-      with:
-        upload_url: ${{ steps.create_release.outputs.upload_url }}
-        asset_path: ./ZLogger.Unity.${{ env.GIT_TAG }}.unitypackage/ZLogger.Unity.${{ env.GIT_TAG }}.unitypackage
-        asset_name: ZLogger.Unity.${{ env.GIT_TAG }}.unitypackage
-        asset_content_type: application/octet-stream

.github/workflows/stale.yml

@@ -0,0 +1,24 @@
+name: "Close stale issues"
+
+on:
+  schedule:
+    - cron: "0 0 * * *"
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v3
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          # enable issue
+          stale-issue-message: "This issue is stale because it has been open 90 days with no activity. Remove stale label or comment or this will be closed in 7 days."
+          stale-issue-label: "stale"
+          # enable pr
+          stale-pr-message: "This PR is stale because it has been open 90 days with no activity. Remove stale label or comment or this will be closed in 7 days."
+          stale-pr-label: "stale"
+          days-before-stale: 90
+          days-before-close: 7
+          exempt-issue-labels: "wip"
+          exempt-pr-labels: "wip"
+          remove-stale-when-updated: true

.gitignore

@@ -157,3 +157,105 @@ src/UniTask/UniTask.Tests.csproj
 src/UniTask/UniTask.Tests.Editor.csproj
 
 src/UniTask/UniTask.*.unitypackage
+
+src/UniTask/UniTask.Linq.csproj
+
+src/UniTask/DOTween.Modules.csproj
+
+src/UniTask/Unity.Addressables.csproj
+
+src/UniTask/Unity.Addressables.Editor.csproj
+
+src/UniTask/Unity.Analytics.DataPrivacy.csproj
+
+src/UniTask/Unity.Recorder.csproj
+
+src/UniTask/Unity.Recorder.Editor.csproj
+
+src/UniTask/Unity.ResourceManager.csproj
+
+src/UniTask/Unity.Rider.Editor.csproj
+
+src/UniTask/Unity.ScriptableBuildPipeline.csproj
+
+src/UniTask/Unity.ScriptableBuildPipeline.Editor.csproj
+
+src/UniTask/Unity.TextMeshPro.csproj
+
+src/UniTask/Unity.TextMeshPro.Editor.csproj
+
+src/UniTask/Unity.Timeline.csproj
+
+src/UniTask/Unity.Timeline.Editor.csproj
+
+src/UniTask/Unity.VisualStudio.Editor.csproj
+
+src/UniTask/Unity.VSCode.Editor.csproj
+
+src/UniTask/UnityEditor.CacheServer.csproj
+
+src/UniTask/UnityEditor.TestRunner.csproj
+
+src/UniTask/UnityEditor.UI.csproj
+
+src/UniTask/UnityEngine.Advertisements.csproj
+
+src/UniTask/UnityEngine.Monetization.csproj
+
+src/UniTask/UnityEngine.TestRunner.csproj
+
+src/UniTask/UnityEngine.UI.csproj
+
+src/UniTask/TempAsm.csproj
+
+src/UniTask/UniTask.Addressables.csproj
+
+src/UniTask/UniTask.DOTween.csproj
+
+src/UniTask/UniTask.TextMeshPro.csproj
+
+src/UniTask/RuntimeUnitTestToolkit.Player.csproj
+
+src/UniTask/TempAsm.Player.csproj
+
+src/UniTask/UniTask.Addressables.Player.csproj
+
+src/UniTask/UniTask.DOTween.Player.csproj
+
+src/UniTask/UniTask.Linq.Player.csproj
+
+src/UniTask/UniTask.Player.csproj
+
+src/UniTask/UniTask.Tests.Player.csproj
+
+src/UniTask/UniTask.TextMeshPro.Player.csproj
+
+src/UniTask/Unity.Addressables.Player.csproj
+
+src/UniTask/Unity.Analytics.DataPrivacy.Player.csproj
+
+src/UniTask/Unity.ResourceManager.Player.csproj
+
+src/UniTask/Unity.ScriptableBuildPipeline.Player.csproj
+
+src/UniTask/Unity.TextMeshPro.Player.csproj
+
+src/UniTask/Unity.Timeline.Player.csproj
+
+src/UniTask/UnityEngine.Advertisements.Player.csproj
+
+src/UniTask/UnityEngine.Monetization.Player.csproj
+
+src/UniTask/UnityEngine.TestRunner.Player.csproj
+
+src/UniTask/UnityEngine.UI.Player.csproj
+
+src/UniTask/DOTween.Modules.Player.csproj
+
+src/UniTask/Assembly-CSharp.Player.csproj
+
+src/UniTask/Unity.EditorCoroutines.Editor.csproj
+
+src/UniTask/.vsconfig
+
+src/UniTask/Logs/ApiUpdaterCheck.txt

docs/.gitignore

@@ -0,0 +1,10 @@
+###############
+#    folder   #
+###############
+/**/DROP/
+/**/TEMP/
+/**/packages/
+/**/bin/
+/**/obj/
+_site
+_DocfxTemplate

docs/api/.gitignore

@@ -0,0 +1,5 @@
+###############
+#  temp file  #
+###############
+*.yml
+.manifest

docs/docfx.json

@@ -0,0 +1,70 @@
+{
+  "metadata": [
+    {
+      "src": [
+        {
+          "files": [
+            "UniTask/Assets/Plugins/UniTask/Runtime/**/*.cs"
+          ],
+          "src": "../src"
+        }
+      ],
+      "dest": "api",
+      "disableGitFeatures": false,
+      "disableDefaultFilter": false
+    }
+  ],
+  "build": {
+    "globalMetadata": {
+      "_disableContribution": true,
+      "_appTitle": "UniTask"
+    },
+    "content": [
+      {
+        "files": [
+          "api/**.yml",
+          "api/index.md"
+        ]
+      },
+      {
+        "files": [
+          "articles/**.md",
+          "articles/**/toc.yml",
+          "toc.yml",
+          "*.md"
+        ]
+      }
+    ],
+    "resource": [
+      {
+        "files": [
+          "images/**"
+        ]
+      }
+    ],
+    "overwrite": [
+      {
+        "files": [
+          "apidoc/**.md"
+        ],
+        "exclude": [
+          "obj/**",
+          "_site/**"
+        ]
+      }
+    ],
+    "dest": "_site",
+
+    "globalMetadataFiles": [],
+    "fileMetadataFiles": [],
+    "template": [
+      "_DocfxTemplate/templates/default-v2.5.2",
+      "_DocfxTemplate/templates/cysharp"
+    ],
+    "postProcessors": [],
+    "markdownEngineName": "markdig",
+    "noLangKeyword": false,
+    "keepFileLink": false,
+    "cleanupCacheHistory": false
+  }
+}

docs/index.md

@@ -0,0 +1,8 @@
+---
+title: Home
+---
+# UniTask
+
+Provides an efficient async/await integration to Unity.
+
+https://github.com/Cysharp/UniTask

docs/toc.yml

@@ -0,0 +1,11 @@
+- name: API Documentation
+  href: api/
+  homepage: api/Cysharp.Threading.Tasks.html
+
+- name: Repository
+  href: https://github.com/Cysharp/UniTask
+  homepage: https://github.com/Cysharp/UniTask
+
+- name: Releases
+  href: https://github.com/Cysharp/UniTask/releases
+  homepage: https://github.com/Cysharp/UniTask/releases

src/UniTask.NetCore/NetCore/AsyncEnumerableExtensions.cs

@@ -0,0 +1,101 @@
+#if !NETSTANDARD2_0
+
+#pragma warning disable 0649
+
+using System;
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+using System.Threading.Tasks.Sources;
+
+namespace Cysharp.Threading.Tasks
+{
+    public static class AsyncEnumerableExtensions
+    {
+        public static IUniTaskAsyncEnumerable<T> AsUniTaskAsyncEnumerable<T>(this IAsyncEnumerable<T> source)
+        {
+            return new AsyncEnumerableToUniTaskAsyncEnumerable<T>(source);
+        }
+
+        public static IAsyncEnumerable<T> AsAsyncEnumerable<T>(this IUniTaskAsyncEnumerable<T> source)
+        {
+            return new UniTaskAsyncEnumerableToAsyncEnumerable<T>(source);
+        }
+
+        sealed class AsyncEnumerableToUniTaskAsyncEnumerable<T> : IUniTaskAsyncEnumerable<T>
+        {
+            readonly IAsyncEnumerable<T> source;
+
+            public AsyncEnumerableToUniTaskAsyncEnumerable(IAsyncEnumerable<T> source)
+            {
+                this.source = source;
+            }
+
+            public IUniTaskAsyncEnumerator<T> GetAsyncEnumerator(CancellationToken cancellationToken = default)
+            {
+                return new Enumerator(source.GetAsyncEnumerator(cancellationToken));
+            }
+
+            sealed class Enumerator : IUniTaskAsyncEnumerator<T>
+            {
+                readonly IAsyncEnumerator<T> enumerator;
+
+                public Enumerator(IAsyncEnumerator<T> enumerator)
+                {
+                    this.enumerator = enumerator;
+                }
+
+                public T Current => enumerator.Current;
+
+                public async UniTask DisposeAsync()
+                {
+                    await enumerator.DisposeAsync();
+                }
+
+                public async UniTask<bool> MoveNextAsync()
+                {
+                    return await enumerator.MoveNextAsync();
+                }
+            }
+        }
+
+        sealed class UniTaskAsyncEnumerableToAsyncEnumerable<T> : IAsyncEnumerable<T>
+        {
+            readonly IUniTaskAsyncEnumerable<T> source;
+
+            public UniTaskAsyncEnumerableToAsyncEnumerable(IUniTaskAsyncEnumerable<T> source)
+            {
+                this.source = source;
+            }
+
+            public IAsyncEnumerator<T> GetAsyncEnumerator(CancellationToken cancellationToken = default)
+            {
+                return new Enumerator(source.GetAsyncEnumerator(cancellationToken));
+            }
+
+            sealed class Enumerator : IAsyncEnumerator<T>
+            {
+                readonly IUniTaskAsyncEnumerator<T> enumerator;
+
+                public Enumerator(IUniTaskAsyncEnumerator<T> enumerator)
+                {
+                    this.enumerator = enumerator;
+                }
+
+                public T Current => enumerator.Current;
+
+                public ValueTask DisposeAsync()
+                {
+                    return enumerator.DisposeAsync();
+                }
+
+                public ValueTask<bool> MoveNextAsync()
+                {
+                    return enumerator.MoveNextAsync();
+                }
+            }
+        }
+    }
+}
+
+#endif

src/UniTask.NetCore/NetCore/UniTask.AsValueTask.cs

@@ -1,6 +1,8 @@
 #pragma warning disable 0649
 
+using System;
 using System.Threading.Tasks;
+using System.Threading.Tasks.Sources;
 
 namespace Cysharp.Threading.Tasks
 {
@@ -8,23 +10,88 @@ namespace Cysharp.Threading.Tasks
     {
         public static ValueTask AsValueTask(this in UniTask task)
         {
+#if NETSTANDARD2_0
+            return new ValueTask(new UniTaskValueTaskSource(task), 0);
+#else
             return task;
+#endif
         }
 
         public static ValueTask<T> AsValueTask<T>(this in UniTask<T> task)
         {
+#if NETSTANDARD2_0
+            return new ValueTask<T>(new UniTaskValueTaskSource<T>(task), 0);
+#else
             return task;
+#endif
         }
 
-        public static UniTask<T> AsUniTask<T>(this ValueTask<T> task, bool useCurrentSynchronizationContext = true)
+        public static async UniTask<T> AsUniTask<T>(this ValueTask<T> task)
         {
-            // NOTE: get _obj and _token directly for low overhead conversion but not yet implemented.
+            return await task;
-            return task.AsTask().AsUniTask(useCurrentSynchronizationContext);
         }
 
-        public static UniTask AsUniTask(this ValueTask task, bool useCurrentSynchronizationContext = true)
+        public static async UniTask AsUniTask(this ValueTask task)
         {
-            return task.AsTask().AsUniTask(useCurrentSynchronizationContext);
+            await task;
         }
+
+#if NETSTANDARD2_0
+
+        class UniTaskValueTaskSource : IValueTaskSource
+        {
+            readonly UniTask task;
+            readonly UniTask.Awaiter awaiter;
+
+            public UniTaskValueTaskSource(UniTask task)
+            {
+                this.task = task;
+                this.awaiter = task.GetAwaiter();
+            }
+
+            public void GetResult(short token)
+            {
+                awaiter.GetResult();
+            }
+
+            public ValueTaskSourceStatus GetStatus(short token)
+            {
+                return (ValueTaskSourceStatus)task.Status;
+            }
+
+            public void OnCompleted(Action<object> continuation, object state, short token, ValueTaskSourceOnCompletedFlags flags)
+            {
+                awaiter.SourceOnCompleted(continuation, state);
+            }
+        }
+
+        class UniTaskValueTaskSource<T> : IValueTaskSource<T>
+        {
+            readonly UniTask<T> task;
+            readonly UniTask<T>.Awaiter awaiter;
+
+            public UniTaskValueTaskSource(UniTask<T> task)
+            {
+                this.task = task;
+                this.awaiter = task.GetAwaiter();
+            }
+
+            public T GetResult(short token)
+            {
+                return awaiter.GetResult();
+            }
+
+            public ValueTaskSourceStatus GetStatus(short token)
+            {
+                return (ValueTaskSourceStatus)task.Status;
+            }
+
+            public void OnCompleted(Action<object> continuation, object state, short token, ValueTaskSourceOnCompletedFlags flags)
+            {
+                awaiter.SourceOnCompleted(continuation, state);
+            }
+        }
+
+#endif
     }
 }

src/UniTask.NetCore/NetCore/UniTask.Delay.cs

@@ -0,0 +1,39 @@
+//using Cysharp.Threading.Tasks.Internal;
+//using System;
+//using System.Collections.Concurrent;
+//using System.Runtime.CompilerServices;
+//using System.Threading;
+
+//namespace Cysharp.Threading.Tasks
+//{
+//    public partial struct UniTask
+//    {
+//        public static UniTask Delay()
+//        {
+//            return default;
+//        }
+
+//        sealed class DelayPromise : IUniTaskSource
+//        {
+//            public void GetResult(short token)
+//            {
+//                throw new NotImplementedException();
+//            }
+
+//            public UniTaskStatus GetStatus(short token)
+//            {
+//                throw new NotImplementedException();
+//            }
+
+//            public void OnCompleted(Action<object> continuation, object state, short token)
+//            {
+//                throw new NotImplementedException();
+//            }
+
+//            public UniTaskStatus UnsafeGetStatus()
+//            {
+//                throw new NotImplementedException();
+//            }
+//        }
+//    }
+//}

src/UniTask.NetCore/NetCore/UniTask.Yield.cs

@@ -62,11 +62,12 @@ namespace Cysharp.Threading.Tasks
             sealed class ThreadPoolWorkItem : IThreadPoolWorkItem, ITaskPoolNode<ThreadPoolWorkItem>
             {
                 static TaskPool<ThreadPoolWorkItem> pool;
-                public ThreadPoolWorkItem NextNode { get; set; }
+                ThreadPoolWorkItem nextNode;
+                public ref ThreadPoolWorkItem NextNode => ref nextNode;
 
                 static ThreadPoolWorkItem()
                 {
-                    TaskPoolMonitor.RegisterSizeGetter(typeof(ThreadPoolWorkItem), () => pool.Size);
+                    TaskPool.RegisterSizeGetter(typeof(ThreadPoolWorkItem), () => pool.Size);
                 }
 
                 Action continuation;

src/UniTask.NetCore/UniTask.NetCore.csproj

@@ -1,12 +1,30 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <TargetFrameworks>netcoreapp3.1;netstandard2.1</TargetFrameworks>
+        <TargetFrameworks>netcoreapp3.1;netstandard2.1;netstandard2.0</TargetFrameworks>
         <AssemblyName>UniTask</AssemblyName>
         <LangVersion>8.0</LangVersion>
         <RootNamespace>Cysharp.Threading.Tasks</RootNamespace>
+
+        <!-- NuGet Packaging -->
+        <Id>UniTask</Id>
+        <PackageVersion>$(Version)</PackageVersion>
+        <Company>Cysharp</Company>
+        <Authors>Cysharp</Authors>
+        <Copyright>© Cysharp, Inc.</Copyright>
+        <PackageTags>task;async</PackageTags>
+        <Description>Provides an efficient async/await integration to Unity and .NET Core.</Description>
+        <PackageProjectUrl>https://github.com/Cysharp/UniTask</PackageProjectUrl>
+        <RepositoryUrl>$(PackageProjectUrl)</RepositoryUrl>
+        <RepositoryType>git</RepositoryType>
+        <PackageLicenseExpression>MIT</PackageLicenseExpression>
+        <PackageIcon>Icon.png</PackageIcon>
     </PropertyGroup>
 
+    <ItemGroup>
+        <None Include="Icon.png" Pack="true" PackagePath="/" />
+    </ItemGroup>
+
     <ItemGroup>
         <Compile Include="..\UniTask\Assets\Plugins\UniTask\Runtime\**\*.cs"
                  Exclude="
@@ -18,7 +36,9 @@
 ..\UniTask\Assets\Plugins\UniTask\Runtime\Internal\DiagnosticsExtensions.cs;
 ..\UniTask\Assets\Plugins\UniTask\Runtime\Internal\PlayerLoopRunner.cs;
 ..\UniTask\Assets\Plugins\UniTask\Runtime\Internal\ContinuationQueue.cs;
+..\UniTask\Assets\Plugins\UniTask\Runtime\Internal\UnityWebRequestExtensions.cs;
   
+..\UniTask\Assets\Plugins\UniTask\Runtime\UniTaskSynchronizationContext.cs;
 ..\UniTask\Assets\Plugins\UniTask\Runtime\CancellationTokenSourceExtensions.cs;
 ..\UniTask\Assets\Plugins\UniTask\Runtime\EnumeratorAsyncExtensions.cs;
 ..\UniTask\Assets\Plugins\UniTask\Runtime\PlayerLoopHelper.cs;
@@ -26,9 +46,7 @@
 ..\UniTask\Assets\Plugins\UniTask\Runtime\UniTask.Run.cs;
 ..\UniTask\Assets\Plugins\UniTask\Runtime\UniTask.Bridge.cs;
 ..\UniTask\Assets\Plugins\UniTask\Runtime\UniTask.WaitUntil.cs;
-..\UniTask\Assets\Plugins\UniTask\Runtime\UnityAsyncExtensions.cs;
+..\UniTask\Assets\Plugins\UniTask\Runtime\UnityAsyncExtensions.*;
-..\UniTask\Assets\Plugins\UniTask\Runtime\UnityAsyncExtensions.uGUI.cs;
-..\UniTask\Assets\Plugins\UniTask\Runtime\UnityAsyncExtensions.MonoBehaviour.cs;
 ..\UniTask\Assets\Plugins\UniTask\Runtime\UnityBindingExtensions.cs;
 " />
     </ItemGroup>

src/UniTask.NetCoreSandbox/Program.cs

@@ -1,4 +1,6 @@
-using Cysharp.Threading.Tasks;
+#pragma warning disable CS1998
+
+using Cysharp.Threading.Tasks;
 
 using System.Linq;
 using System;
@@ -15,6 +17,19 @@ using System.Reactive.Concurrency;
 
 namespace NetCoreSandbox
 {
+    public class MySyncContext : SynchronizationContext
+    {
+        public MySyncContext()
+        {
+        }
+
+        public override void Post(SendOrPostCallback d, object state)
+        {
+            Console.WriteLine("Called SyncContext Post!");
+            base.Post(d, state);
+        }
+    }
+
     public class Text
     {
 
@@ -43,6 +58,24 @@ namespace NetCoreSandbox
 
     }
 
+    class Foo
+    {
+        public async UniTask MethodFooAsync()
+        {
+            await MethodBarAsync();
+        }
+
+        private async UniTask MethodBarAsync()
+
+        {
+            Throw();
+        }
+
+        private void Throw()
+        {
+            throw new Exception();
+        }
+    }
 
     public struct TestAwaiter : ICriticalNotifyCompletion
     {
@@ -193,12 +226,68 @@ namespace NetCoreSandbox
             await Task.Delay(10, cancellationToken);
         }
 
+        public class MyDisposable : IDisposable
+        {
+            public void Dispose()
+            {
+
+            }
+        }
+
+        static void Test()
+        {
+            var disp = new MyDisposable();
+
+            using var _ = new MyDisposable();
+
+            Console.WriteLine("tako");
+        }
+
+
+        static async UniTask FooBarAsync()
+        {
+            await using (UniTask.ReturnToCurrentSynchronizationContext())
+            {
+                await UniTask.SwitchToThreadPool();
+
+
+
+
+            }
+        }
+
+
+
+
+        static async UniTask Aaa()
+        {
+            await FooBarAsync();
+
+            Console.WriteLine("FooBarAsync End");
+        }
+
+        static async UniTask WhereSelect()
+        {
+            await foreach (var item in UniTaskAsyncEnumerable.Range(1, 10)
+                .SelectAwait(async x =>
+                {
+                    await UniTask.Yield();
+                    return x;
+                })
+                .Where(x => x % 2 == 0))
+            {
+                Console.WriteLine(item);
+            }
+        }
 
 
         static async Task Main(string[] args)
         {
 #if !DEBUG
+         
             
+
+
             //await new AllocationCheck().ViaUniTaskVoid();
             //Console.ReadLine();
             BenchmarkDotNet.Running.BenchmarkSwitcher.FromAssembly(typeof(Program).Assembly).Run(args);
@@ -206,42 +295,25 @@ namespace NetCoreSandbox
             //await new ComparisonBenchmarks().ViaUniTaskT();
             return;
 #endif
-            // await new AllocationCheck().ViaUniTaskVoid();
 
-            // AsyncTest().Forget();
+            var e = UniTaskAsyncEnumerable.Create<int>(async (writer, token) =>
-
-
-            //AsyncTest().Forget();
-
-            // AsyncTest().Forget();
-
-            ThreadPool.SetMinThreads(100, 100);
-
-            //List<UniTask<int>> list = new List<UniTask<int>>();
-            for (int i = 0; i < short.MaxValue; i++)
             {
-                ////    list.Add(AsyncTest());
+                for (int i = 0; i < 5; i++)
-                await YieldCore();
+                {
-            }
+                    Console.WriteLine($"Start {i}");
-            //await UniTask.WhenAll(list);
+                    await writer.YieldAsync(i);
+                    Console.WriteLine($"End {i}");
+                }
+            });
 
-            //Console.WriteLine("TOGO");
+            var ee = e.GetAsyncEnumerator();
-
+            while (await ee.MoveNextAsync())
-            //var a = await AsyncTest();
-            //var b = AsyncTest();
-            //var c = AsyncTest();
-            await YieldCore();
-
-            //await b;
-            //await c;
-
-
-            foreach (var item in Cysharp.Threading.Tasks.Internal.TaskPoolMonitor.GetCacheSizeInfo())
             {
-                Console.WriteLine(item);
+                Console.WriteLine("ForEach " + ee.Current);
             }
 
-            Console.ReadLine();
+
+
         }
 
         static async UniTask YieldCore()

src/UniTask.NetCoreSandbox/QueueCheck.cs

@@ -0,0 +1,473 @@
+using BenchmarkDotNet.Attributes;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using System.Threading;
+
+[Config(typeof(BenchmarkConfig))]
+public class QueueCheck
+{
+    Node node1 = new Node();
+    Node node2 = new Node();
+    RefNode refNode1 = new RefNode();
+    RefNode refNode2 = new RefNode();
+    Queue<Node> q1 = new Queue<Node>();
+    Stack<Node> s1 = new Stack<Node>();
+    ConcurrentQueue<Node> cq = new ConcurrentQueue<Node>();
+    ConcurrentStack<Node> cs = new ConcurrentStack<Node>();
+    static TaskPool<Node> pool;
+    static TaskPoolRefNode<RefNode> poolRefNode;
+    static TaskPoolEqualNull<Node> poolEqualNull;
+    static TaskPoolClass<Node> poolClass = new TaskPoolClass<Node>();
+    static TaskPoolWithoutSize<Node> poolWithoutSize;
+    static TaskPoolWithoutLock<Node> poolWithoutLock;
+
+    [Benchmark]
+    public void Queue()
+    {
+        q1.Enqueue(node1);
+        q1.Enqueue(node1);
+        q1.TryDequeue(out _);
+        q1.TryDequeue(out _);
+    }
+
+    [Benchmark]
+    public void QueueLock()
+    {
+        lock (q1) { q1.Enqueue(node1); }
+        lock (q1) { q1.Enqueue(node1); }
+        lock (q1) { q1.TryDequeue(out _); }
+        lock (q1) { q1.TryDequeue(out _); }
+    }
+
+    [Benchmark]
+    public void Stack()
+    {
+        s1.Push(node1);
+        s1.Push(node2);
+        s1.TryPop(out _);
+        s1.TryPop(out _);
+    }
+
+    [Benchmark]
+    public void StackLock()
+    {
+        lock (s1) { s1.Push(node1); }
+        lock (s1) { s1.Push(node2); }
+        lock (s1) { s1.TryPop(out _); }
+        lock (s1) { s1.TryPop(out _); }
+    }
+
+    [Benchmark]
+    public void ConcurrentQueue()
+    {
+        cq.Enqueue(node1);
+        cq.Enqueue(node1);
+        cq.TryDequeue(out _);
+        cq.TryDequeue(out _);
+    }
+
+    [Benchmark]
+    public void ConcurrentStack()
+    {
+        cs.Push(node1);
+        cs.Push(node2);
+        cs.TryPop(out _);
+        cs.TryPop(out _);
+    }
+
+    [Benchmark]
+    public void TaskPool()
+    {
+        pool.TryPush(node1);
+        pool.TryPush(node2);
+        pool.TryPop(out _);
+        pool.TryPop(out _);
+    }
+    [Benchmark]
+    public void TaskPoolRefNode()
+    {
+        poolRefNode.TryPush(refNode1);
+        poolRefNode.TryPush(refNode2);
+        poolRefNode.TryPop(out _);
+        poolRefNode.TryPop(out _);
+    }
+
+    [Benchmark]
+    public void TaskPoolEqualNull()
+    {
+        poolEqualNull.TryPush(node1);
+        poolEqualNull.TryPush(node2);
+        poolEqualNull.TryPop(out _);
+        poolEqualNull.TryPop(out _);
+    }
+
+    [Benchmark]
+    public void TaskPoolClass()
+    {
+        poolClass.TryPush(node1);
+        poolClass.TryPush(node2);
+        poolClass.TryPop(out _);
+        poolClass.TryPop(out _);
+    }
+
+    [Benchmark]
+    public void TaskPoolWithoutSize()
+    {
+        poolWithoutSize.TryPush(node1);
+        poolWithoutSize.TryPush(node2);
+        poolWithoutSize.TryPop(out _);
+        poolWithoutSize.TryPop(out _);
+    }
+
+    [Benchmark]
+    public void TaskPoolWithoutLock()
+    {
+        poolWithoutLock.TryPush(node1);
+        poolWithoutLock.TryPush(node2);
+        poolWithoutLock.TryPop(out _);
+        poolWithoutLock.TryPop(out _);
+    }
+}
+
+public sealed class Node : ITaskPoolNode<Node>
+{
+    public Node NextNode { get; set; }
+}
+
+public interface ITaskPoolNode<T>
+{
+    T NextNode { get; set; }
+}
+
+public sealed class RefNode :ITaskPoolRefNode<RefNode>
+{
+    RefNode nextNode;
+    public ref RefNode NextNode => ref nextNode;
+}
+
+public interface ITaskPoolRefNode<T>
+{
+    ref T NextNode { get; }
+}
+
+
+// mutable struct, don't mark readonly.
+[StructLayout(LayoutKind.Auto)]
+public struct TaskPoolWithoutLock<T>
+    where T : class, ITaskPoolNode<T>
+{
+    int size;
+    T root;
+
+    public int Size => size;
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public bool TryPop(out T result)
+    {
+        //if (Interlocked.CompareExchange(ref gate, 1, 0) == 0)
+        {
+            var v = root;
+            if (!(v is null))
+            {
+                root = v.NextNode;
+                v.NextNode = null;
+                size--;
+                result = v;
+                //      Volatile.Write(ref gate, 0);
+                return true;
+            }
+
+            //Volatile.Write(ref gate, 0);
+        }
+        result = default;
+        return false;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public bool TryPush(T item)
+    {
+        //if (Interlocked.CompareExchange(ref gate, 1, 0) == 0)
+        {
+            //if (size < TaskPool.MaxPoolSize)
+            {
+                item.NextNode = root;
+                root = item;
+                size++;
+                //      Volatile.Write(ref gate, 0);
+                return true;
+            }
+            //else
+            {
+                //  Volatile.Write(ref gate, 0);
+            }
+        }
+        //return false;
+    }
+}
+
+[StructLayout(LayoutKind.Auto)]
+public struct TaskPool<T>
+    where T : class, ITaskPoolNode<T>
+{
+    int gate;
+    int size;
+    T root;
+
+    public int Size => size;
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public bool TryPop(out T result)
+    {
+        if (Interlocked.CompareExchange(ref gate, 1, 0) == 0)
+        {
+            var v = root;
+            if (!(v is null))
+            {
+                root = v.NextNode;
+                v.NextNode = null;
+                size--;
+                result = v;
+                Volatile.Write(ref gate, 0);
+                return true;
+            }
+
+            Volatile.Write(ref gate, 0);
+        }
+        result = default;
+        return false;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public bool TryPush(T item)
+    {
+        if (Interlocked.CompareExchange(ref gate, 1, 0) == 0)
+        {
+            //if (size < TaskPool.MaxPoolSize)
+            {
+                item.NextNode = root;
+                root = item;
+                size++;
+                Volatile.Write(ref gate, 0);
+                return true;
+            }
+            //else
+            {
+                //  Volatile.Write(ref gate, 0);
+            }
+        }
+        return false;
+    }
+}
+[StructLayout(LayoutKind.Auto)]
+public struct TaskPoolRefNode<T>
+    where T : class, ITaskPoolRefNode<T>
+{
+    int gate;
+    int size;
+    T root;
+
+    public int Size => size;
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public bool TryPop(out T result)
+    {
+        if (Interlocked.CompareExchange(ref gate, 1, 0) == 0)
+        {
+            var v = root;
+            if (!(v is null))
+            {
+                ref var nextNode = ref v.NextNode;
+                root = nextNode;
+                nextNode = null;
+                size--;
+                result = v;
+                Volatile.Write(ref gate, 0);
+                return true;
+            }
+
+            Volatile.Write(ref gate, 0);
+        }
+        result = default;
+        return false;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public bool TryPush(T item)
+    {
+        if (Interlocked.CompareExchange(ref gate, 1, 0) == 0)
+        {
+            //if (size < TaskPool.MaxPoolSize)
+            {
+                item.NextNode = root;
+                root = item;
+                size++;
+                Volatile.Write(ref gate, 0);
+                return true;
+            }
+            //else
+            {
+                //  Volatile.Write(ref gate, 0);
+            }
+        }
+        return false;
+    }
+}
+
+[StructLayout(LayoutKind.Auto)]
+public struct TaskPoolEqualNull<T>
+    where T : class, ITaskPoolNode<T>
+{
+    int gate;
+    int size;
+    T root;
+
+    public int Size => size;
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public bool TryPop(out T result)
+    {
+        if (Interlocked.CompareExchange(ref gate, 1, 0) == 0)
+        {
+            var v = root;
+            if (v != null)
+            {
+                root = v.NextNode;
+                v.NextNode = null;
+                size--;
+                result = v;
+                Volatile.Write(ref gate, 0);
+                return true;
+            }
+
+            Volatile.Write(ref gate, 0);
+        }
+        result = default;
+        return false;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public bool TryPush(T item)
+    {
+        if (Interlocked.CompareExchange(ref gate, 1, 0) == 0)
+        {
+            //if (size < TaskPool.MaxPoolSize)
+            {
+                item.NextNode = root;
+                root = item;
+                size++;
+                Volatile.Write(ref gate, 0);
+                return true;
+            }
+            //else
+            {
+                //  Volatile.Write(ref gate, 0);
+            }
+        }
+        return false;
+    }
+}
+
+public class TaskPoolClass<T>
+    where T : class, ITaskPoolNode<T>
+{
+    int gate;
+    int size;
+    T root;
+
+    public int Size => size;
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public bool TryPop(out T result)
+    {
+        if (Interlocked.CompareExchange(ref gate, 1, 0) == 0)
+        {
+            var v = root;
+            if (!(v is null))
+            {
+                root = v.NextNode;
+                v.NextNode = null;
+                size--;
+                result = v;
+                Volatile.Write(ref gate, 0);
+                return true;
+            }
+
+            Volatile.Write(ref gate, 0);
+        }
+        result = default;
+        return false;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public bool TryPush(T item)
+    {
+        if (Interlocked.CompareExchange(ref gate, 1, 0) == 0)
+        {
+            //if (size < TaskPool.MaxPoolSize)
+            {
+                item.NextNode = root;
+                root = item;
+                size++;
+                Volatile.Write(ref gate, 0);
+                return true;
+            }
+            //else
+            {
+                //  Volatile.Write(ref gate, 0);
+            }
+        }
+        return false;
+    }
+}
+
+[StructLayout(LayoutKind.Auto)]
+public struct TaskPoolWithoutSize<T>
+    where T : class, ITaskPoolNode<T>
+{
+    int gate;
+    T root;
+
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public bool TryPop(out T result)
+    {
+        if (Interlocked.CompareExchange(ref gate, 1, 0) == 0)
+        {
+            var v = root;
+            if (!(v is null))
+            {
+                root = v.NextNode;
+                v.NextNode = null;
+                result = v;
+                Volatile.Write(ref gate, 0);
+                return true;
+            }
+
+            Volatile.Write(ref gate, 0);
+        }
+        result = default;
+        return false;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public bool TryPush(T item)
+    {
+        if (Interlocked.CompareExchange(ref gate, 1, 0) == 0)
+        {
+            //if (size < TaskPool.MaxPoolSize)
+            {
+                item.NextNode = root;
+                root = item;
+                Volatile.Write(ref gate, 0);
+                return true;
+            }
+            //else
+            {
+                //  Volatile.Write(ref gate, 0);
+            }
+        }
+        return false;
+    }
+}

src/UniTask.NetCoreTests/AsyncLazyTest.cs

@@ -0,0 +1,167 @@
+using Cysharp.Threading.Tasks;
+using FluentAssertions;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using System.Threading.Channels;
+using Cysharp.Threading.Tasks.Linq;
+using System.Threading.Tasks;
+using Xunit;
+
+namespace NetCoreTests
+{
+    public class AsyncLazyTest
+    {
+        [Fact]
+        public async Task LazyLazy()
+        {
+            {
+                var l = UniTask.Lazy(() => After());
+                var a = AwaitAwait(l.Task);
+                var b = AwaitAwait(l.Task);
+                var c = AwaitAwait(l.Task);
+
+                await a;
+                await b;
+                await c;
+            }
+            {
+                var l = UniTask.Lazy(() => AfterException());
+                var a = AwaitAwait(l.Task);
+                var b = AwaitAwait(l.Task);
+                var c = AwaitAwait(l.Task);
+
+                await Assert.ThrowsAsync<TaskTestException>(async () => await a);
+                await Assert.ThrowsAsync<TaskTestException>(async () => await b);
+                await Assert.ThrowsAsync<TaskTestException>(async () => await c);
+            }
+        }
+
+        [Fact]
+        public async Task LazyImmediate()
+        {
+            {
+                var l = UniTask.Lazy(() => UniTask.FromResult(1).AsUniTask());
+                var a = AwaitAwait(l.Task);
+                var b = AwaitAwait(l.Task);
+                var c = AwaitAwait(l.Task);
+
+                await a;
+                await b;
+                await c;
+            }
+            {
+                var l = UniTask.Lazy(() => UniTask.FromException(new TaskTestException()));
+                var a = AwaitAwait(l.Task);
+                var b = AwaitAwait(l.Task);
+                var c = AwaitAwait(l.Task);
+
+                await Assert.ThrowsAsync<TaskTestException>(async () => await a);
+                await Assert.ThrowsAsync<TaskTestException>(async () => await b);
+                await Assert.ThrowsAsync<TaskTestException>(async () => await c);
+            }
+        }
+
+        static async UniTask AwaitAwait(UniTask t)
+        {
+            await t;
+        }
+
+
+        async UniTask After()
+        {
+            await UniTask.Yield();
+            Thread.Sleep(TimeSpan.FromSeconds(1));
+            await UniTask.Yield();
+            await UniTask.Yield();
+        }
+
+        async UniTask AfterException()
+        {
+            await UniTask.Yield();
+            Thread.Sleep(TimeSpan.FromSeconds(1));
+            await UniTask.Yield();
+            throw new TaskTestException();
+        }
+    }
+
+    public class AsyncLazyTest2
+    {
+        [Fact]
+        public async Task LazyLazy()
+        {
+            {
+                var l = UniTask.Lazy(() => After());
+                var a = AwaitAwait(l.Task);
+                var b = AwaitAwait(l.Task);
+                var c = AwaitAwait(l.Task);
+
+                var a2 = await a;
+                var b2 = await b;
+                var c2 = await c;
+                (a2, b2, c2).Should().Be((10, 10, 10));
+            }
+            {
+                var l = UniTask.Lazy(() => AfterException());
+                var a = AwaitAwait(l.Task);
+                var b = AwaitAwait(l.Task);
+                var c = AwaitAwait(l.Task);
+
+                await Assert.ThrowsAsync<TaskTestException>(async () => await a);
+                await Assert.ThrowsAsync<TaskTestException>(async () => await b);
+                await Assert.ThrowsAsync<TaskTestException>(async () => await c);
+            }
+        }
+
+        [Fact]
+        public async Task LazyImmediate()
+        {
+            {
+                var l = UniTask.Lazy(() => UniTask.FromResult(1));
+                var a = AwaitAwait(l.Task);
+                var b = AwaitAwait(l.Task);
+                var c = AwaitAwait(l.Task);
+
+                var a2 = await a;
+                var b2 = await b;
+                var c2 = await c;
+                (a2, b2, c2).Should().Be((1, 1, 1));
+            }
+            {
+                var l = UniTask.Lazy(() => UniTask.FromException<int>(new TaskTestException()));
+                var a = AwaitAwait(l.Task);
+                var b = AwaitAwait(l.Task);
+                var c = AwaitAwait(l.Task);
+
+                await Assert.ThrowsAsync<TaskTestException>(async () => await a);
+                await Assert.ThrowsAsync<TaskTestException>(async () => await b);
+                await Assert.ThrowsAsync<TaskTestException>(async () => await c);
+            }
+        }
+
+        static async UniTask<int> AwaitAwait(UniTask<int> t)
+        {
+            return await t;
+        }
+
+
+        async UniTask<int> After()
+        {
+            await UniTask.Yield();
+            Thread.Sleep(TimeSpan.FromSeconds(1));
+            await UniTask.Yield();
+            await UniTask.Yield();
+            return 10;
+        }
+
+        async UniTask<int> AfterException()
+        {
+            await UniTask.Yield();
+            Thread.Sleep(TimeSpan.FromSeconds(1));
+            await UniTask.Yield();
+            throw new TaskTestException();
+        }
+    }
+}

src/UniTask.NetCoreTests/AsyncReactivePropertyTest.cs

@@ -112,6 +112,85 @@ namespace NetCoreTests
             state.Value.Should().Be(20);
         }
 
+        [Fact]
+        public async Task WaitAsyncTest()
+        {
+            var rp = new AsyncReactiveProperty<int>(128);
+
+            var f = await rp.FirstAsync();
+            f.Should().Be(128);
+
+            {
+                var t = rp.WaitAsync();
+                rp.Value = 99;
+                rp.Value = 100;
+                var v = await t;
+
+                v.Should().Be(99);
+            }
+
+            {
+                var t = rp.WaitAsync();
+                rp.Value = 99;
+                rp.Value = 100;
+                var v = await t;
+
+                v.Should().Be(99);
+            }
+        }
+
+
+        [Fact]
+        public async Task WaitAsyncCancellationTest()
+        {
+            var cts = new CancellationTokenSource();
+
+            var rp = new AsyncReactiveProperty<int>(128);
+
+            var t = rp.WaitAsync(cts.Token);
+
+            cts.Cancel();
+
+            rp.Value = 99;
+            rp.Value = 100;
+
+            await Assert.ThrowsAsync<OperationCanceledException>(async () => { await t; });
+        }
+
+
+        [Fact]
+        public async Task ReadOnlyWaitAsyncTest()
+        {
+            var rp = new AsyncReactiveProperty<int>(128);
+            var rrp = rp.ToReadOnlyAsyncReactiveProperty(CancellationToken.None);
+
+            var t = rrp.WaitAsync();
+            rp.Value = 99;
+            rp.Value = 100;
+            var v = await t;
+
+            v.Should().Be(99);
+        }
+
+
+        [Fact]
+        public async Task ReadOnlyWaitAsyncCancellationTest()
+        {
+            var cts = new CancellationTokenSource();
+
+            var rp = new AsyncReactiveProperty<int>(128);
+            var rrp = rp.ToReadOnlyAsyncReactiveProperty(CancellationToken.None);
+
+            var t = rrp.WaitAsync(cts.Token);
+
+            cts.Cancel();
+
+            rp.Value = 99;
+            rp.Value = 100;
+
+            await Assert.ThrowsAsync<OperationCanceledException>(async () => { await t; });
+        }
+
     }
 
 

src/UniTask.NetCoreTests/CompletionSourceTest.cs

@@ -0,0 +1,590 @@
+using Cysharp.Threading.Tasks;
+using FluentAssertions;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using System.Threading.Channels;
+using Cysharp.Threading.Tasks.Linq;
+using System.Threading.Tasks;
+using Xunit;
+
+namespace NetCoreTests
+{
+    public class CompletionSourceTest
+    {
+        [Fact]
+        public async Task SetFirst()
+        {
+            {
+                var tcs = new UniTaskCompletionSource();
+
+                tcs.TrySetResult();
+                await tcs.Task; // ok.
+                await tcs.Task; // ok.
+                tcs.Task.Status.Should().Be(UniTaskStatus.Succeeded);
+            }
+
+            {
+                var tcs = new UniTaskCompletionSource();
+
+                tcs.TrySetException(new TestException());
+
+                await Assert.ThrowsAsync<TestException>(async () => await tcs.Task);
+                await Assert.ThrowsAsync<TestException>(async () => await tcs.Task);
+
+                tcs.Task.Status.Should().Be(UniTaskStatus.Faulted);
+            }
+
+            var cts = new CancellationTokenSource();
+
+            {
+                var tcs = new UniTaskCompletionSource();
+
+                tcs.TrySetException(new OperationCanceledException(cts.Token));
+
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await tcs.Task)).CancellationToken.Should().Be(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await tcs.Task)).CancellationToken.Should().Be(cts.Token);
+
+                tcs.Task.Status.Should().Be(UniTaskStatus.Canceled);
+            }
+
+            {
+                var tcs = new UniTaskCompletionSource();
+
+                tcs.TrySetCanceled(cts.Token);
+
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await tcs.Task)).CancellationToken.Should().Be(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await tcs.Task)).CancellationToken.Should().Be(cts.Token);
+
+                tcs.Task.Status.Should().Be(UniTaskStatus.Canceled);
+            }
+        }
+
+        [Fact]
+        public async Task SingleOnFirst()
+        {
+            {
+                var tcs = new UniTaskCompletionSource();
+
+                async UniTask Await()
+                {
+                    await tcs.Task;
+                }
+
+                var a = Await();
+
+                tcs.TrySetResult();
+                await a;
+                await tcs.Task; // ok.
+                tcs.Task.Status.Should().Be(UniTaskStatus.Succeeded);
+            }
+
+            {
+                var tcs = new UniTaskCompletionSource();
+
+                async UniTask Await()
+                {
+                    await tcs.Task;
+                }
+
+                var a = Await();
+
+                tcs.TrySetException(new TestException());
+                await Assert.ThrowsAsync<TestException>(async () => await a);
+                await Assert.ThrowsAsync<TestException>(async () => await tcs.Task);
+                tcs.Task.Status.Should().Be(UniTaskStatus.Faulted);
+            }
+
+            var cts = new CancellationTokenSource();
+
+            {
+                var tcs = new UniTaskCompletionSource();
+
+                async UniTask Await()
+                {
+                    await tcs.Task;
+                }
+
+                var a = Await();
+
+                tcs.TrySetException(new OperationCanceledException(cts.Token));
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await a)).CancellationToken.Should().Be(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await tcs.Task)).CancellationToken.Should().Be(cts.Token);
+                tcs.Task.Status.Should().Be(UniTaskStatus.Canceled);
+            }
+            {
+                var tcs = new UniTaskCompletionSource();
+
+                async UniTask Await()
+                {
+                    await tcs.Task;
+                }
+
+                var a = Await();
+
+                tcs.TrySetCanceled(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await a)).CancellationToken.Should().Be(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await tcs.Task)).CancellationToken.Should().Be(cts.Token);
+                tcs.Task.Status.Should().Be(UniTaskStatus.Canceled);
+            }
+        }
+
+        [Fact]
+        public async Task MultiOne()
+        {
+            {
+                var tcs = new UniTaskCompletionSource();
+
+                async UniTask Await()
+                {
+                    await tcs.Task;
+                }
+
+                var a = Await();
+                var b = Await();
+                tcs.TrySetResult();
+                await a;
+                await b;
+                await tcs.Task; // ok.
+                tcs.Task.Status.Should().Be(UniTaskStatus.Succeeded);
+            }
+
+            {
+                var tcs = new UniTaskCompletionSource();
+
+                async UniTask Await()
+                {
+                    await tcs.Task;
+                }
+
+                var a = Await();
+                var b = Await();
+
+                tcs.TrySetException(new TestException());
+                await Assert.ThrowsAsync<TestException>(async () => await a);
+                await Assert.ThrowsAsync<TestException>(async () => await b);
+                await Assert.ThrowsAsync<TestException>(async () => await tcs.Task);
+                tcs.Task.Status.Should().Be(UniTaskStatus.Faulted);
+            }
+
+            var cts = new CancellationTokenSource();
+
+            {
+                var tcs = new UniTaskCompletionSource();
+
+                async UniTask Await()
+                {
+                    await tcs.Task;
+                }
+
+                var a = Await();
+                var b = Await();
+
+                tcs.TrySetException(new OperationCanceledException(cts.Token));
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await a)).CancellationToken.Should().Be(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await b)).CancellationToken.Should().Be(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await tcs.Task)).CancellationToken.Should().Be(cts.Token);
+                tcs.Task.Status.Should().Be(UniTaskStatus.Canceled);
+            }
+            {
+                var tcs = new UniTaskCompletionSource();
+
+                async UniTask Await()
+                {
+                    await tcs.Task;
+                }
+
+                var a = Await();
+                var b = Await();
+
+                tcs.TrySetCanceled(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await a)).CancellationToken.Should().Be(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await b)).CancellationToken.Should().Be(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await tcs.Task)).CancellationToken.Should().Be(cts.Token);
+                tcs.Task.Status.Should().Be(UniTaskStatus.Canceled);
+            }
+        }
+
+        [Fact]
+        public async Task MultiTwo()
+        {
+            {
+                var tcs = new UniTaskCompletionSource();
+
+                async UniTask Await()
+                {
+                    await tcs.Task;
+                }
+
+                var a = Await();
+                var b = Await();
+                var c = Await();
+                tcs.TrySetResult();
+                await a;
+                await b;
+                await c;
+                await tcs.Task; // ok.
+                tcs.Task.Status.Should().Be(UniTaskStatus.Succeeded);
+            }
+
+            {
+                var tcs = new UniTaskCompletionSource();
+
+                async UniTask Await()
+                {
+                    await tcs.Task;
+                }
+
+                var a = Await();
+                var b = Await();
+                var c = Await();
+
+                tcs.TrySetException(new TestException());
+                await Assert.ThrowsAsync<TestException>(async () => await a);
+                await Assert.ThrowsAsync<TestException>(async () => await b);
+                await Assert.ThrowsAsync<TestException>(async () => await c);
+                await Assert.ThrowsAsync<TestException>(async () => await tcs.Task);
+                tcs.Task.Status.Should().Be(UniTaskStatus.Faulted);
+            }
+
+            var cts = new CancellationTokenSource();
+
+            {
+                var tcs = new UniTaskCompletionSource();
+
+                async UniTask Await()
+                {
+                    await tcs.Task;
+                }
+
+                var a = Await();
+                var b = Await();
+                var c = Await();
+
+                tcs.TrySetException(new OperationCanceledException(cts.Token));
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await a)).CancellationToken.Should().Be(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await b)).CancellationToken.Should().Be(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await c)).CancellationToken.Should().Be(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await tcs.Task)).CancellationToken.Should().Be(cts.Token);
+                tcs.Task.Status.Should().Be(UniTaskStatus.Canceled);
+            }
+            {
+                var tcs = new UniTaskCompletionSource();
+
+                async UniTask Await()
+                {
+                    await tcs.Task;
+                }
+
+                var a = Await();
+                var b = Await();
+                var c = Await();
+
+                tcs.TrySetCanceled(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await a)).CancellationToken.Should().Be(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await b)).CancellationToken.Should().Be(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await c)).CancellationToken.Should().Be(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await tcs.Task)).CancellationToken.Should().Be(cts.Token);
+                tcs.Task.Status.Should().Be(UniTaskStatus.Canceled);
+            }
+        }
+
+        class TestException : Exception
+        {
+
+        }
+    }
+
+    public class CompletionSourceTest2
+    {
+        [Fact]
+        public async Task SetFirst()
+        {
+            {
+                var tcs = new UniTaskCompletionSource<int>();
+
+                tcs.TrySetResult(10);
+                var a = await tcs.Task; // ok.
+                var b = await tcs.Task; // ok.
+                a.Should().Be(10);
+                b.Should().Be(10);
+                tcs.Task.Status.Should().Be(UniTaskStatus.Succeeded);
+            }
+
+            {
+                var tcs = new UniTaskCompletionSource<int>();
+
+                tcs.TrySetException(new TestException());
+
+                await Assert.ThrowsAsync<TestException>(async () => await tcs.Task);
+                await Assert.ThrowsAsync<TestException>(async () => await tcs.Task);
+
+                tcs.Task.Status.Should().Be(UniTaskStatus.Faulted);
+            }
+
+            var cts = new CancellationTokenSource();
+
+            {
+                var tcs = new UniTaskCompletionSource<int>();
+
+                tcs.TrySetException(new OperationCanceledException(cts.Token));
+
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await tcs.Task)).CancellationToken.Should().Be(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await tcs.Task)).CancellationToken.Should().Be(cts.Token);
+
+                tcs.Task.Status.Should().Be(UniTaskStatus.Canceled);
+            }
+
+            {
+                var tcs = new UniTaskCompletionSource<int>();
+
+                tcs.TrySetCanceled(cts.Token);
+
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await tcs.Task)).CancellationToken.Should().Be(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await tcs.Task)).CancellationToken.Should().Be(cts.Token);
+
+                tcs.Task.Status.Should().Be(UniTaskStatus.Canceled);
+            }
+        }
+
+        [Fact]
+        public async Task SingleOnFirst()
+        {
+            {
+                var tcs = new UniTaskCompletionSource<int>();
+
+                async UniTask<int> Await()
+                {
+                    return await tcs.Task;
+                }
+
+                var a = Await();
+
+                tcs.TrySetResult(10);
+                var r1 = await a;
+                var r2 = await tcs.Task; // ok.
+                r1.Should().Be(10);
+                r2.Should().Be(10);
+                tcs.Task.Status.Should().Be(UniTaskStatus.Succeeded);
+            }
+
+            {
+                var tcs = new UniTaskCompletionSource<int>();
+
+                async UniTask<int> Await()
+                {
+                    return await tcs.Task;
+                }
+
+                var a = Await();
+
+                tcs.TrySetException(new TestException());
+                await Assert.ThrowsAsync<TestException>(async () => await a);
+                await Assert.ThrowsAsync<TestException>(async () => await tcs.Task);
+                tcs.Task.Status.Should().Be(UniTaskStatus.Faulted);
+            }
+
+            var cts = new CancellationTokenSource();
+
+            {
+                var tcs = new UniTaskCompletionSource<int>();
+
+                async UniTask<int> Await()
+                {
+                    return await tcs.Task;
+                }
+
+                var a = Await();
+
+                tcs.TrySetException(new OperationCanceledException(cts.Token));
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await a)).CancellationToken.Should().Be(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await tcs.Task)).CancellationToken.Should().Be(cts.Token);
+                tcs.Task.Status.Should().Be(UniTaskStatus.Canceled);
+            }
+            {
+                var tcs = new UniTaskCompletionSource<int>();
+
+                async UniTask<int> Await()
+                {
+                    return await tcs.Task;
+                }
+
+                var a = Await();
+
+                tcs.TrySetCanceled(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await a)).CancellationToken.Should().Be(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await tcs.Task)).CancellationToken.Should().Be(cts.Token);
+                tcs.Task.Status.Should().Be(UniTaskStatus.Canceled);
+            }
+        }
+
+        [Fact]
+        public async Task MultiOne()
+        {
+            {
+                var tcs = new UniTaskCompletionSource<int>();
+
+                async UniTask<int> Await()
+                {
+                    return await tcs.Task;
+                }
+
+                var a = Await();
+                var b = Await();
+                tcs.TrySetResult(10);
+                var r1 = await a;
+                var r2 = await b;
+                var r3 = await tcs.Task; // ok.
+                (r1, r2, r3).Should().Be((10, 10, 10));
+                tcs.Task.Status.Should().Be(UniTaskStatus.Succeeded);
+            }
+
+            {
+                var tcs = new UniTaskCompletionSource<int>();
+
+                async UniTask<int> Await()
+                {
+                    return await tcs.Task;
+                }
+
+                var a = Await();
+                var b = Await();
+
+                tcs.TrySetException(new TestException());
+                await Assert.ThrowsAsync<TestException>(async () => await a);
+                await Assert.ThrowsAsync<TestException>(async () => await b);
+                await Assert.ThrowsAsync<TestException>(async () => await tcs.Task);
+                tcs.Task.Status.Should().Be(UniTaskStatus.Faulted);
+            }
+
+            var cts = new CancellationTokenSource();
+
+            {
+                var tcs = new UniTaskCompletionSource<int>();
+
+                async UniTask<int> Await()
+                {
+                    return await tcs.Task;
+                }
+
+                var a = Await();
+                var b = Await();
+
+                tcs.TrySetException(new OperationCanceledException(cts.Token));
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await a)).CancellationToken.Should().Be(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await b)).CancellationToken.Should().Be(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await tcs.Task)).CancellationToken.Should().Be(cts.Token);
+                tcs.Task.Status.Should().Be(UniTaskStatus.Canceled);
+            }
+            {
+                var tcs = new UniTaskCompletionSource<int>();
+
+                async UniTask<int> Await()
+                {
+                    return await tcs.Task;
+                }
+
+                var a = Await();
+                var b = Await();
+
+                tcs.TrySetCanceled(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await a)).CancellationToken.Should().Be(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await b)).CancellationToken.Should().Be(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await tcs.Task)).CancellationToken.Should().Be(cts.Token);
+                tcs.Task.Status.Should().Be(UniTaskStatus.Canceled);
+            }
+        }
+
+        [Fact]
+        public async Task MultiTwo()
+        {
+            {
+                var tcs = new UniTaskCompletionSource<int>();
+
+                async UniTask<int> Await()
+                {
+                    return await tcs.Task;
+                }
+
+                var a = Await();
+                var b = Await();
+                var c = Await();
+                tcs.TrySetResult(10);
+                var r1 = await a;
+                var r2 = await b;
+                var r3 = await c;
+                var r4 = await tcs.Task; // ok.
+                (r1, r2, r3, r4).Should().Be((10, 10, 10, 10));
+                tcs.Task.Status.Should().Be(UniTaskStatus.Succeeded);
+            }
+
+            {
+                var tcs = new UniTaskCompletionSource<int>();
+
+                async UniTask<int> Await()
+                {
+                    return await tcs.Task;
+                }
+
+                var a = Await();
+                var b = Await();
+                var c = Await();
+
+                tcs.TrySetException(new TestException());
+                await Assert.ThrowsAsync<TestException>(async () => await a);
+                await Assert.ThrowsAsync<TestException>(async () => await b);
+                await Assert.ThrowsAsync<TestException>(async () => await c);
+                await Assert.ThrowsAsync<TestException>(async () => await tcs.Task);
+                tcs.Task.Status.Should().Be(UniTaskStatus.Faulted);
+            }
+
+            var cts = new CancellationTokenSource();
+
+            {
+                var tcs = new UniTaskCompletionSource<int>();
+
+                async UniTask<int> Await()
+                {
+                    return await tcs.Task;
+                }
+
+                var a = Await();
+                var b = Await();
+                var c = Await();
+
+                tcs.TrySetException(new OperationCanceledException(cts.Token));
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await a)).CancellationToken.Should().Be(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await b)).CancellationToken.Should().Be(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await c)).CancellationToken.Should().Be(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await tcs.Task)).CancellationToken.Should().Be(cts.Token);
+                tcs.Task.Status.Should().Be(UniTaskStatus.Canceled);
+            }
+            {
+                var tcs = new UniTaskCompletionSource<int>();
+
+                async UniTask<int> Await()
+                {
+                    return await tcs.Task;
+                }
+
+                var a = Await();
+                var b = Await();
+                var c = Await();
+
+                tcs.TrySetCanceled(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await a)).CancellationToken.Should().Be(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await b)).CancellationToken.Should().Be(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await c)).CancellationToken.Should().Be(cts.Token);
+                (await Assert.ThrowsAsync<OperationCanceledException>(async () => await tcs.Task)).CancellationToken.Should().Be(cts.Token);
+                tcs.Task.Status.Should().Be(UniTaskStatus.Canceled);
+            }
+        }
+
+        class TestException : Exception
+        {
+
+        }
+    }
+}

src/UniTask.NetCoreTests/Linq/CreateTest.cs

@@ -0,0 +1,170 @@
+#pragma warning disable CS1998
+#pragma warning disable CS0162
+
+using Cysharp.Threading.Tasks;
+using Cysharp.Threading.Tasks.Linq;
+using FluentAssertions;
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Threading.Tasks;
+using Xunit;
+
+namespace NetCoreTests.Linq
+{
+    public class CreateTest
+    {
+        [Fact]
+        public async Task SyncCreation()
+        {
+            var from = 10;
+            var count = 100;
+
+            var xs = await UniTaskAsyncEnumerable.Create<int>(async (writer, token) =>
+            {
+                for (int i = 0; i < count; i++)
+                {
+                    await writer.YieldAsync(from + i);
+                }
+            }).ToArrayAsync();
+
+            var ys = await Range(from, count).AsUniTaskAsyncEnumerable().ToArrayAsync();
+
+            xs.Should().BeEquivalentTo(ys);
+        }
+
+        [Fact]
+        public async Task SyncManually()
+        {
+            var list = new List<int>();
+            var xs = UniTaskAsyncEnumerable.Create<int>(async (writer, token) =>
+            {
+                list.Add(100);
+                await writer.YieldAsync(10);
+                
+                list.Add(200);
+                await writer.YieldAsync(20);
+
+                list.Add(300);
+                await writer.YieldAsync(30);
+            
+                list.Add(400);
+            });
+
+            list.Should().BeEmpty();
+            var e = xs.GetAsyncEnumerator();
+
+            list.Should().BeEmpty();
+
+            await e.MoveNextAsync();
+            list.Should().BeEquivalentTo(100);
+            e.Current.Should().Be(10);
+
+            await e.MoveNextAsync();
+            list.Should().BeEquivalentTo(100, 200);
+            e.Current.Should().Be(20);
+
+            await e.MoveNextAsync();
+            list.Should().BeEquivalentTo(100, 200, 300);
+            e.Current.Should().Be(30);
+
+            (await e.MoveNextAsync()).Should().BeFalse();
+            list.Should().BeEquivalentTo(100, 200, 300, 400);
+        }
+
+        [Fact]
+        public async Task SyncExceptionFirst()
+        {
+            var from = 10;
+            var count = 100;
+
+            var xs = UniTaskAsyncEnumerable.Create<int>(async (writer, token) =>
+            {
+                for (int i = 0; i < count; i++)
+                {
+                    throw new UniTaskTestException();
+                    await writer.YieldAsync(from + i);
+                }
+            });
+
+            await Assert.ThrowsAsync<UniTaskTestException>(async () => await xs.ToArrayAsync());
+        }
+
+        [Fact]
+        public async Task SyncException()
+        {
+            var from = 10;
+            var count = 100;
+
+            var xs = UniTaskAsyncEnumerable.Create<int>(async (writer, token) =>
+            {
+                for (int i = 0; i < count; i++)
+                {
+                    await writer.YieldAsync(from + i);
+
+                    if (i == 15)
+                    {
+                        throw new UniTaskTestException();
+                    }
+                }
+            });
+
+            await Assert.ThrowsAsync<UniTaskTestException>(async () => await xs.ToArrayAsync());
+        }
+
+        [Fact]
+        public async Task ASyncManually()
+        {
+            var list = new List<int>();
+            var xs = UniTaskAsyncEnumerable.Create<int>(async (writer, token) =>
+            {
+                await UniTask.Yield();
+
+                list.Add(100);
+                await writer.YieldAsync(10);
+
+                await UniTask.Yield();
+
+                list.Add(200);
+                await writer.YieldAsync(20);
+
+                await UniTask.Yield();
+                list.Add(300);
+                await UniTask.Yield();
+                await writer.YieldAsync(30);
+
+                await UniTask.Yield();
+
+                list.Add(400);
+            });
+
+            list.Should().BeEmpty();
+            var e = xs.GetAsyncEnumerator();
+
+            list.Should().BeEmpty();
+
+            await e.MoveNextAsync();
+            list.Should().BeEquivalentTo(100);
+            e.Current.Should().Be(10);
+
+            await e.MoveNextAsync();
+            list.Should().BeEquivalentTo(100, 200);
+            e.Current.Should().Be(20);
+
+            await e.MoveNextAsync();
+            list.Should().BeEquivalentTo(100, 200, 300);
+            e.Current.Should().Be(30);
+
+            (await e.MoveNextAsync()).Should().BeFalse();
+            list.Should().BeEquivalentTo(100, 200, 300, 400);
+        }
+
+        async IAsyncEnumerable<int> Range(int from, int count)
+        {
+            for (int i = 0; i < count; i++)
+            {
+                yield return from + i;
+            }
+        }
+    }
+}

src/UniTask.NetCoreTests/Linq/TakeInfinityTest.cs

@@ -43,7 +43,7 @@ namespace NetCoreTests.Linq
         }
 
         [Fact]
-        public async Task TakeUntil()
+        public async Task TakeUntilCanceled()
         {
             var cts = new CancellationTokenSource();
 
@@ -72,7 +72,7 @@ namespace NetCoreTests.Linq
         }
 
         [Fact]
-        public async Task SkipUntil()
+        public async Task SkipUntilCanceled()
         {
             var cts = new CancellationTokenSource();
 
@@ -85,7 +85,7 @@ namespace NetCoreTests.Linq
             await c;
             var foo = await xs;
 
-            foo.Should().BeEquivalentTo(new[] { 30, 40 });
+            foo.Should().BeEquivalentTo(new[] { 20, 30, 40 });
 
             async Task CancelAsync()
             {
@@ -102,5 +102,64 @@ namespace NetCoreTests.Linq
             }
         }
 
+        [Fact]
+        public async Task TakeUntil()
+        {
+            var cts = new AsyncReactiveProperty<int>(0);
+
+            var rp = new AsyncReactiveProperty<int>(1);
+
+            var xs = rp.TakeUntil(cts.WaitAsync()).ToArrayAsync();
+
+            var c = CancelAsync();
+
+            await c;
+            var foo = await xs;
+
+            foo.Should().BeEquivalentTo(new[] { 1, 10, 20 });
+
+            async Task CancelAsync()
+            {
+                rp.Value = 10;
+                await Task.Yield();
+                rp.Value = 20;
+                await Task.Yield();
+                cts.Value = 9999;
+                rp.Value = 30;
+                await Task.Yield();
+                rp.Value = 40;
+            }
+        }
+
+        [Fact]
+        public async Task SkipUntil()
+        {
+            var cts = new AsyncReactiveProperty<int>(0);
+
+            var rp = new AsyncReactiveProperty<int>(1);
+
+            var xs = rp.SkipUntil(cts.WaitAsync()).ToArrayAsync();
+
+            var c = CancelAsync();
+
+            await c;
+            var foo = await xs;
+
+            foo.Should().BeEquivalentTo(new[] { 20, 30, 40 });
+
+            async Task CancelAsync()
+            {
+                rp.Value = 10;
+                await Task.Yield();
+                rp.Value = 20;
+                await Task.Yield();
+                cts.Value = 9999;
+                rp.Value = 30;
+                await Task.Yield();
+                rp.Value = 40;
+
+                rp.Dispose(); // complete.
+            }
+        }
     }
 }

src/UniTask.NetCoreTests/TriggerEventTest.cs

@@ -0,0 +1,637 @@
+using Cysharp.Threading.Tasks;
+using FluentAssertions;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using System.Threading.Channels;
+using Cysharp.Threading.Tasks.Linq;
+using System.Threading.Tasks;
+using Xunit;
+
+namespace NetCoreTests
+{
+    public class TriggerEventTest
+    {
+        [Fact]
+        public void SimpleAdd()
+        {
+            var ev = new TriggerEvent<int>();
+
+            // do nothing
+            ev.SetResult(0);
+            ev.SetError(null);
+            ev.SetCompleted();
+            ev.SetCanceled(default);
+
+            {
+                var one = new TestEvent(1);
+
+                ev.Add(one);
+
+                ev.SetResult(10);
+                ev.SetResult(20);
+                ev.SetResult(30);
+
+                one.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+
+                ev.SetCompleted();
+
+                one.CompletedCalled.Count.Should().Be(1);
+
+                // do nothing
+                ev.SetResult(0);
+                ev.SetError(null);
+                ev.SetCompleted();
+                ev.SetCanceled(default);
+
+                one.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+                one.CompletedCalled.Count.Should().Be(1);
+            }
+            // after removed, onemore
+            {
+                var one = new TestEvent(1);
+
+                ev.Add(one);
+
+                ev.SetResult(10);
+                ev.SetResult(20);
+                ev.SetResult(30);
+
+                one.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+
+                ev.SetCompleted();
+
+                one.CompletedCalled.Count.Should().Be(1);
+
+                // do nothing
+                ev.SetResult(0);
+                ev.SetError(null);
+                ev.SetCompleted();
+                ev.SetCanceled(default);
+
+                one.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+                one.CompletedCalled.Count.Should().Be(1);
+            }
+        }
+
+        [Fact]
+        public void AddFour()
+        {
+            var ev = new TriggerEvent<int>();
+
+            // do nothing
+            ev.SetResult(0);
+            ev.SetError(null);
+            ev.SetCompleted();
+            ev.SetCanceled(default);
+
+            {
+                var one = new TestEvent(1);
+                var two = new TestEvent(2);
+                var three = new TestEvent(3);
+                var four = new TestEvent(4);
+
+                ev.Add(one);
+                ev.Add(two);
+                ev.Add(three);
+                ev.Add(four);
+
+                ev.SetResult(10);
+                ev.SetResult(20);
+                ev.SetResult(30);
+
+                one.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+                two.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+                three.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+                four.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+
+                ev.SetCompleted();
+
+                one.CompletedCalled.Count.Should().Be(1);
+                two.CompletedCalled.Count.Should().Be(1);
+                three.CompletedCalled.Count.Should().Be(1);
+
+
+                // do nothing
+                ev.SetResult(0);
+                ev.SetError(null);
+                ev.SetCompleted();
+                ev.SetCanceled(default);
+
+                one.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+                one.CompletedCalled.Count.Should().Be(1);
+                two.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+                three.CompletedCalled.Count.Should().Be(1);
+                two.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+                three.CompletedCalled.Count.Should().Be(1);
+            }
+
+            // after removed, onemore.
+            {
+                var one = new TestEvent(1);
+                var two = new TestEvent(2);
+                var three = new TestEvent(3);
+                var four = new TestEvent(4);
+
+                ev.Add(one);
+                ev.Add(two);
+                ev.Add(three);
+                ev.Add(four);
+
+                ev.SetResult(10);
+                ev.SetResult(20);
+                ev.SetResult(30);
+                ev.Add(four);
+
+                one.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+                two.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+                three.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+                four.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+
+                ev.SetCompleted();
+
+                one.CompletedCalled.Count.Should().Be(1);
+                two.CompletedCalled.Count.Should().Be(1);
+                three.CompletedCalled.Count.Should().Be(1);
+
+
+                // do nothing
+                ev.SetResult(0);
+                ev.SetError(null);
+                ev.SetCompleted();
+                ev.SetCanceled(default);
+
+                one.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+                one.CompletedCalled.Count.Should().Be(1);
+                two.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+                three.CompletedCalled.Count.Should().Be(1);
+                two.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+                three.CompletedCalled.Count.Should().Be(1);
+            }
+        }
+
+
+        [Fact]
+        public void OneRemove()
+        {
+            var ev = new TriggerEvent<int>();
+            {
+                var one = new TestEvent(1);
+                var two = new TestEvent(2);
+                var three = new TestEvent(3);
+
+                ev.Add(one);
+                ev.Add(two);
+                ev.Add(three);
+
+                ev.SetResult(10);
+                ev.SetResult(20);
+                ev.SetResult(30);
+
+                one.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+                two.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+                three.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+
+                ev.Remove(one);
+
+                ev.SetResult(40);
+                ev.SetResult(50);
+                ev.SetResult(60);
+
+                one.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+                two.NextCalled.Should().BeEquivalentTo(10, 20, 30, 40, 50, 60);
+                three.NextCalled.Should().BeEquivalentTo(10, 20, 30, 40, 50, 60);
+            }
+        }
+        [Fact]
+        public void TwoRemove()
+        {
+            var ev = new TriggerEvent<int>();
+            {
+                var one = new TestEvent(1);
+                var two = new TestEvent(2);
+                var three = new TestEvent(3);
+
+                ev.Add(one);
+                ev.Add(two);
+                ev.Add(three);
+
+                ev.SetResult(10);
+                ev.SetResult(20);
+                ev.SetResult(30);
+
+                one.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+                two.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+                three.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+
+                ev.Remove(two);
+
+                ev.SetResult(40);
+                ev.SetResult(50);
+                ev.SetResult(60);
+
+                one.NextCalled.Should().BeEquivalentTo(10, 20, 30, 40, 50, 60);
+                two.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+                three.NextCalled.Should().BeEquivalentTo(10, 20, 30, 40, 50, 60);
+            }
+        }
+        [Fact]
+        public void ThreeRemove()
+        {
+            var ev = new TriggerEvent<int>();
+            {
+                var one = new TestEvent(1);
+                var two = new TestEvent(2);
+                var three = new TestEvent(3);
+
+                ev.Add(one);
+                ev.Add(two);
+                ev.Add(three);
+
+                ev.SetResult(10);
+                ev.SetResult(20);
+                ev.SetResult(30);
+
+                one.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+                two.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+                three.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+
+                ev.Remove(three);
+
+                ev.SetResult(40);
+                ev.SetResult(50);
+                ev.SetResult(60);
+
+                one.NextCalled.Should().BeEquivalentTo(10, 20, 30, 40, 50, 60);
+                two.NextCalled.Should().BeEquivalentTo(10, 20, 30, 40, 50, 60);
+                three.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+            }
+        }
+
+        [Fact]
+        public void RemoveSelf()
+        {
+            new RemoveMe().Run1();
+            new RemoveMe().Run2();
+            new RemoveMe().Run3();
+        }
+
+        [Fact]
+        public void RemoveNextInIterating()
+        {
+            new RemoveNext().Run1();
+            new RemoveNext().Run2();
+            new RemoveNext().Run3();
+        }
+
+        [Fact]
+        public void RemoveNextNextTest()
+        {
+            new RemoveNextNext().Run1();
+            new RemoveNextNext().Run2();
+        }
+
+
+        [Fact]
+        public void AddTest()
+        {
+            new AddMe().Run1();
+            new AddMe().Run2();
+        }
+
+        public class RemoveMe
+        {
+            TriggerEvent<int> ev;
+
+            public void Run1()
+            {
+                TestEvent one = default;
+                one = new TestEvent(1, () => ev.Remove(one));
+
+                var two = new TestEvent(2);
+                var three = new TestEvent(3);
+
+                ev.Add(one);
+                ev.Add(two);
+                ev.Add(three);
+
+                ev.SetResult(10);
+                ev.SetResult(20);
+                ev.SetResult(30);
+
+                one.NextCalled.Should().BeEquivalentTo(10);
+                two.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+                three.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+            }
+
+            public void Run2()
+            {
+                TestEvent one = default;
+                one = new TestEvent(1, () => ev.Remove(one));
+
+                var two = new TestEvent(2);
+                var three = new TestEvent(3);
+
+                ev.Add(two);
+                ev.Add(one); // add second.
+                ev.Add(three);
+
+                ev.SetResult(10);
+                ev.SetResult(20);
+                ev.SetResult(30);
+
+                one.NextCalled.Should().BeEquivalentTo(10);
+                two.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+                three.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+            }
+
+            public void Run3()
+            {
+                TestEvent one = default;
+                one = new TestEvent(1, () => ev.Remove(one));
+
+                var two = new TestEvent(2);
+                var three = new TestEvent(3);
+
+                ev.Add(two);
+                ev.Add(three);
+                ev.Add(one); // add thired.
+
+                ev.SetResult(10);
+                ev.SetResult(20);
+                ev.SetResult(30);
+
+                one.NextCalled.Should().BeEquivalentTo(10);
+                two.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+                three.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+            }
+        }
+
+        public class RemoveNext
+        {
+            TriggerEvent<int> ev;
+
+            public void Run1()
+            {
+                TestEvent one = default;
+                TestEvent two = default;
+                TestEvent three = default;
+                one = new TestEvent(1, () => ev.Remove(two));
+                two = new TestEvent(2);
+                three = new TestEvent(3);
+
+                ev.Add(one);
+                ev.Add(two);
+                ev.Add(three);
+
+                ev.SetResult(10);
+                ev.SetResult(20);
+                ev.SetResult(30);
+
+                one.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+                two.NextCalled.Count.Should().Be(0);
+                three.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+            }
+
+            public void Run2()
+            {
+                TestEvent one = default;
+                TestEvent two = default;
+                TestEvent three = default;
+                one = new TestEvent(1, () => ev.Remove(two));
+                two = new TestEvent(2);
+                three = new TestEvent(3);
+
+                ev.Add(two);
+                ev.Add(one); // add second
+                ev.Add(three);
+
+                ev.SetResult(10);
+                ev.SetResult(20);
+                ev.SetResult(30);
+
+                one.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+                two.NextCalled.Should().BeEquivalentTo(10);
+                three.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+            }
+
+            public void Run3()
+            {
+                TestEvent one = default;
+                TestEvent two = default;
+                TestEvent three = default;
+                one = new TestEvent(1, () => ev.Remove(two));
+                two = new TestEvent(2);
+                three = new TestEvent(3);
+
+                ev.Add(two);
+                ev.Add(three);
+                ev.Add(one); // add thired.
+
+                ev.SetResult(10);
+                ev.SetResult(20);
+                ev.SetResult(30);
+
+                one.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+                two.NextCalled.Should().BeEquivalentTo(10);
+                three.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+            }
+        }
+
+        public class RemoveNextNext
+        {
+            TriggerEvent<int> ev;
+
+            public void Run1()
+            {
+                TestEvent one = default;
+                TestEvent two = default;
+                TestEvent three = default;
+                TestEvent four = default;
+                one = new TestEvent(1, () => { ev.Remove(two); ev.Remove(three); });
+                two = new TestEvent(2);
+                three = new TestEvent(3);
+                four = new TestEvent(4);
+
+                ev.Add(one);
+                ev.Add(two);
+                ev.Add(three);
+                ev.Add(four);
+
+                ev.SetResult(10);
+                ev.SetResult(20);
+                ev.SetResult(30);
+
+                one.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+                two.NextCalled.Count.Should().Be(0);
+                three.NextCalled.Count.Should().Be(0);
+                four.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+            }
+
+            public void Run2()
+            {
+                TestEvent one = default;
+                TestEvent two = default;
+                TestEvent three = default;
+                TestEvent four = default;
+                one = new TestEvent(1, () => { ev.Remove(one); ev.Remove(two); ev.Remove(three); });
+                two = new TestEvent(2);
+                three = new TestEvent(3);
+                four = new TestEvent(4);
+
+                ev.Add(one);
+                ev.Add(two);
+                ev.Add(three);
+                ev.Add(four);
+
+                ev.SetResult(10);
+                ev.SetResult(20);
+                ev.SetResult(30);
+
+                one.NextCalled.Should().BeEquivalentTo(10);
+                two.NextCalled.Count.Should().Be(0);
+                three.NextCalled.Count.Should().Be(0);
+                four.NextCalled.Should().BeEquivalentTo(10, 20, 30);
+            }
+
+
+        }
+
+        public class AddMe
+        {
+            TriggerEvent<int> ev;
+
+            public void Run1()
+            {
+                TestEvent one = default;
+                TestEvent two = default;
+                TestEvent three = default;
+                TestEvent four = default;
+
+                one = new TestEvent(1, () =>
+                {
+                    if (two == null)
+                    {
+                        ev.Add(two = new TestEvent(2));
+                    }
+                    else if (three == null)
+                    {
+                        ev.Add(three = new TestEvent(3));
+                    }
+                    else if (four == null)
+                    {
+                        ev.Add(four = new TestEvent(4));
+                    }
+                });
+
+                ev.Add(one);
+
+                ev.SetResult(10);
+                ev.SetResult(20);
+                ev.SetResult(30);
+                ev.SetResult(40);
+
+                one.NextCalled.Should().BeEquivalentTo(10, 20, 30, 40);
+                two.NextCalled.Should().BeEquivalentTo(20, 30, 40);
+                three.NextCalled.Should().BeEquivalentTo(30, 40);
+                four.NextCalled.Should().BeEquivalentTo(40);
+            }
+
+            public void Run2()
+            {
+                TestEvent one = default;
+                TestEvent two = default;
+                TestEvent three = default;
+                TestEvent four = default;
+
+                one = new TestEvent(1, () =>
+                {
+                    if (two == null)
+                    {
+                        ev.Add(two = new TestEvent(2, () =>
+                        {
+                            if (three == null)
+                            {
+                                ev.Add(three = new TestEvent(3, () =>
+                                {
+                                    if (four == null)
+                                    {
+                                        ev.Add(four = new TestEvent(4));
+                                    }
+                                }));
+                            }
+                        }));
+                    }
+                });
+
+                ev.Add(one);
+
+                ev.SetResult(10);
+                ev.SetResult(20);
+                ev.SetResult(30);
+                ev.SetResult(40);
+
+                one.NextCalled.Should().BeEquivalentTo(10, 20, 30, 40);
+                two.NextCalled.Should().BeEquivalentTo(20, 30, 40);
+                three.NextCalled.Should().BeEquivalentTo(30, 40);
+                four.NextCalled.Should().BeEquivalentTo(40);
+            }
+        }
+    }
+
+    public class TestEvent : ITriggerHandler<int>
+    {
+        public readonly int Id;
+        readonly Action iteratingEvent;
+
+        public TestEvent(int id)
+        {
+            this.Id = id;
+        }
+
+        public TestEvent(int id, Action iteratingEvent)
+        {
+            this.Id = id;
+            this.iteratingEvent = iteratingEvent;
+        }
+
+        public List<int> NextCalled = new List<int>();
+        public List<Exception> ErrorCalled = new List<Exception>();
+        public List<object> CompletedCalled = new List<object>();
+        public List<CancellationToken> CancelCalled = new List<CancellationToken>();
+
+        public ITriggerHandler<int> Prev { get; set; }
+        public ITriggerHandler<int> Next { get; set; }
+
+        public void OnCanceled(CancellationToken cancellationToken)
+        {
+            CancelCalled.Add(cancellationToken);
+
+        }
+
+        public void OnCompleted()
+        {
+            CompletedCalled.Add(new object());
+        }
+
+        public void OnError(Exception ex)
+        {
+            ErrorCalled.Add(ex);
+        }
+
+        public void OnNext(int value)
+        {
+            NextCalled.Add(value);
+            iteratingEvent?.Invoke();
+        }
+
+        public override string ToString()
+        {
+            return Id.ToString();
+        }
+    }
+
+
+}

src/UniTask.NetCoreTests/WithCancellationTest.cs

@@ -0,0 +1,40 @@
+using Cysharp.Threading.Tasks;
+using FluentAssertions;
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using Xunit;
+
+namespace NetCoreTests
+{
+    public class WithCancellationTest
+    {
+        [Fact]
+        public async Task Standard()
+        {
+            CancellationTokenSource cts = new CancellationTokenSource();
+
+            var v = await UniTask.Run(() => 10).WithCancellation(cts.Token);
+
+            v.Should().Be(10);
+        }
+
+        [Fact]
+        public async Task Cancel()
+        {
+            CancellationTokenSource cts = new CancellationTokenSource();
+
+            var t = UniTask.Create(async () =>
+            {
+                await Task.Delay(TimeSpan.FromSeconds(1));
+                return 10;
+            }).WithCancellation(cts.Token);
+
+            cts.Cancel();
+
+            (await Assert.ThrowsAsync<OperationCanceledException>(async () => await t)).CancellationToken.Should().Be(cts.Token);
+        }
+    }
+}

src/UniTask/Assembly-CSharp-firstpass.csproj

@@ -0,0 +1,734 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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+    <LangVersion>latest</LangVersion>
+  </PropertyGroup>
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProductVersion>10.0.20506</ProductVersion>
+    <SchemaVersion>2.0</SchemaVersion>
+    <RootNamespace></RootNamespace>
+    <ProjectGuid>{CECB0124-DA37-D676-2B9E-00C5241684F4}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <AssemblyName>Assembly-CSharp-firstpass</AssemblyName>
+    <TargetFrameworkVersion>v4.7.1</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <BaseDirectory>.</BaseDirectory>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>Temp\Bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE;UNITY_2020_2_1;UNITY_2020_2;UNITY_2020;UNITY_5_3_OR_NEWER;UNITY_5_4_OR_NEWER;UNITY_5_5_OR_NEWER;UNITY_5_6_OR_NEWER;UNITY_2017_1_OR_NEWER;UNITY_2017_2_OR_NEWER;UNITY_2017_3_OR_NEWER;UNITY_2017_4_OR_NEWER;UNITY_2018_1_OR_NEWER;UNITY_2018_2_OR_NEWER;UNITY_2018_3_OR_NEWER;UNITY_2018_4_OR_NEWER;UNITY_2019_1_OR_NEWER;UNITY_2019_2_OR_NEWER;UNITY_2019_3_OR_NEWER;UNITY_2019_4_OR_NEWER;UNITY_2020_1_OR_NEWER;UNITY_2020_2_OR_NEWER;PLATFORM_ARCH_64;UNITY_64;UNITY_INCLUDE_TESTS;USE_SEARCH_ENGINE_API;SCENE_TEMPLATE_MODULE;ENABLE_AR;ENABLE_AUDIO;ENABLE_CACHING;ENABLE_CLOTH;ENABLE_EVENT_QUEUE;ENABLE_MICROPHONE;ENABLE_MULTIPLE_DISPLAYS;ENABLE_PHYSICS;ENABLE_TEXTURE_STREAMING;ENABLE_VIRTUALTEXTURING;ENABLE_UNET;ENABLE_LZMA;ENABLE_UNITYEVENTS;ENABLE_VR;ENABLE_WEBCAM;ENABLE_UNITYWEBREQUEST;ENABLE_WWW;ENABLE_CLOUD_SERVICES;ENABLE_CLOUD_SERVICES_COLLAB;ENABLE_CLOUD_SERVICES_COLLAB_SOFTLOCKS;ENABLE_CLOUD_SERVICES_ADS;ENABLE_CLOUD_SERVICES_USE_WEBREQUEST;ENABLE_CLOUD_SERVICES_CRASH_REPORTING;ENABLE_CLOUD_SERVICES_PURCHASING;ENABLE_CLOUD_SERVICES_ANALYTICS;ENABLE_CLOUD_SERVICES_UNET;ENABLE_CLOUD_SERVICES_BUILD;ENABLE_CLOUD_LICENSE;ENABLE_EDITOR_HUB_LICENSE;ENABLE_WEBSOCKET_CLIENT;ENABLE_DIRECTOR_AUDIO;ENABLE_DIRECTOR_TEXTURE;ENABLE_MANAGED_JOBS;ENABLE_MANAGED_TRANSFORM_JOBS;ENABLE_MANAGED_ANIMATION_JOBS;ENABLE_MANAGED_AUDIO_JOBS;INCLUDE_DYNAMIC_GI;ENABLE_MONO_BDWGC;ENABLE_SCRIPTING_GC_WBARRIERS;PLATFORM_SUPPORTS_MONO;RENDER_SOFTWARE_CURSOR;ENABLE_VIDEO;PLATFORM_STANDALONE;PLATFORM_STANDALONE_WIN;UNITY_STANDALONE_WIN;UNITY_STANDALONE;ENABLE_RUNTIME_GI;ENABLE_MOVIES;ENABLE_NETWORK;ENABLE_CRUNCH_TEXTURE_COMPRESSION;ENABLE_OUT_OF_PROCESS_CRASH_HANDLER;ENABLE_CLUSTER_SYNC;ENABLE_CLUSTERINPUT;PLATFORM_UPDATES_TIME_OUTSIDE_OF_PLAYER_LOOP;GFXDEVICE_WAITFOREVENT_MESSAGEPUMP;ENABLE_WEBSOCKET_HOST;ENABLE_MONO;NET_STANDARD_2_0;ENABLE_PROFILER;UNITY_ASSERTIONS;UNITY_EDITOR;UNITY_EDITOR_64;UNITY_EDITOR_WIN;ENABLE_UNITY_COLLECTIONS_CHECKS;ENABLE_BURST_AOT;UNITY_TEAM_LICENSE;UNITY_PRO_LICENSE;ENABLE_CUSTOM_RENDER_TEXTURE;ENABLE_DIRECTOR;ENABLE_LOCALIZATION;ENABLE_SPRITES;ENABLE_TERRAIN;ENABLE_TILEMAP;ENABLE_TIMELINE;ENABLE_LEGACY_INPUT_MANAGER;CSHARP_7_OR_LATER;CSHARP_7_3_OR_NEWER</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <NoWarn>0169</NoWarn>
+    <AllowUnsafeBlocks>False</AllowUnsafeBlocks>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>Temp\bin\Release\</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <NoWarn>0169</NoWarn>
+    <AllowUnsafeBlocks>False</AllowUnsafeBlocks>
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+  <PropertyGroup>
+    <NoConfig>true</NoConfig>
+    <NoStdLib>true</NoStdLib>
+    <AddAdditionalExplicitAssemblyReferences>false</AddAdditionalExplicitAssemblyReferences>
+    <ImplicitlyExpandNETStandardFacades>false</ImplicitlyExpandNETStandardFacades>
+    <ImplicitlyExpandDesignTimeFacades>false</ImplicitlyExpandDesignTimeFacades>
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+  <PropertyGroup>
+    <ProjectTypeGuids>{E097FAD1-6243-4DAD-9C02-E9B9EFC3FFC1};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <UnityProjectGenerator>Package</UnityProjectGenerator>
+    <UnityProjectGeneratorVersion>2.0.5</UnityProjectGeneratorVersion>
+    <UnityProjectType>GamePlugins:3</UnityProjectType>
+    <UnityBuildTarget>StandaloneWindows64:19</UnityBuildTarget>
+    <UnityVersion>2020.2.1f1</UnityVersion>
+  </PropertyGroup>
+  <ItemGroup>
+    <Analyzer Include="C:\Program Files (x86)\Microsoft Visual Studio Tools for Unity\16.0\Analyzers\Microsoft.Unity.Analyzers.dll" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Assets\Plugins\UniTask\Runtime\CompilerServices\AsyncUniTaskMethodBuilder.cs" />
+    <Compile Include="Assets\Plugins\UniTask\Runtime\UniTask.Bridge.cs" />
+    <Compile Include="Assets\Plugins\UniTask\Runtime\EnumerableAsyncExtensions.cs" />
+    <Compile Include="Assets\Plugins\UniTask\Runtime\Internal\Error.cs" />
+    <Compile Include="Assets\Plugins\UniTask\Runtime\Channel.cs" />
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+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Resources.Reader.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Resources.ResourceManager">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Resources.ResourceManager.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Resources.Writer">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Resources.Writer.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Runtime.CompilerServices.VisualC">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Runtime.CompilerServices.VisualC.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Runtime">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Runtime.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Runtime.Extensions">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Runtime.Extensions.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Runtime.Handles">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Runtime.Handles.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Runtime.InteropServices">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Runtime.InteropServices.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Runtime.InteropServices.RuntimeInformation">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Runtime.InteropServices.RuntimeInformation.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Runtime.Numerics">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Runtime.Numerics.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Runtime.Serialization.Formatters">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Runtime.Serialization.Formatters.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Runtime.Serialization.Json">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Runtime.Serialization.Json.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Runtime.Serialization.Primitives">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Runtime.Serialization.Primitives.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Runtime.Serialization.Xml">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Runtime.Serialization.Xml.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Security.Claims">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Security.Claims.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Security.Cryptography.Algorithms">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Security.Cryptography.Algorithms.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Security.Cryptography.Csp">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Security.Cryptography.Csp.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Security.Cryptography.Encoding">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Security.Cryptography.Encoding.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Security.Cryptography.Primitives">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Security.Cryptography.Primitives.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Security.Cryptography.X509Certificates">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Security.Cryptography.X509Certificates.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Security.Principal">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Security.Principal.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Security.SecureString">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Security.SecureString.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Text.Encoding">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Text.Encoding.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Text.Encoding.Extensions">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Text.Encoding.Extensions.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Text.RegularExpressions">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Text.RegularExpressions.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Threading">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Threading.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Threading.Overlapped">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Threading.Overlapped.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Threading.Tasks">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Threading.Tasks.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Threading.Tasks.Parallel">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Threading.Tasks.Parallel.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Threading.Thread">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Threading.Thread.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Threading.ThreadPool">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Threading.ThreadPool.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Threading.Timer">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Threading.Timer.dll</HintPath>
+    </Reference>
+    <Reference Include="System.ValueTuple">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.ValueTuple.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Xml.ReaderWriter">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Xml.ReaderWriter.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Xml.XDocument">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Xml.XDocument.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Xml.XmlDocument">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Xml.XmlDocument.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Xml.XmlSerializer">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Xml.XmlSerializer.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Xml.XPath">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Xml.XPath.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Xml.XPath.XDocument">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netstandard\System.Xml.XPath.XDocument.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Numerics.Vectors">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\Extensions\2.0.0\System.Numerics.Vectors.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Runtime.InteropServices.WindowsRuntime">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\Extensions\2.0.0\System.Runtime.InteropServices.WindowsRuntime.dll</HintPath>
+    </Reference>
+    <Reference Include="mscorlib">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netfx\mscorlib.dll</HintPath>
+    </Reference>
+    <Reference Include="System.ComponentModel.Composition">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netfx\System.ComponentModel.Composition.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Core">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netfx\System.Core.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Data">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netfx\System.Data.dll</HintPath>
+    </Reference>
+    <Reference Include="System">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netfx\System.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Drawing">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netfx\System.Drawing.dll</HintPath>
+    </Reference>
+    <Reference Include="System.IO.Compression.FileSystem">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netfx\System.IO.Compression.FileSystem.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Net">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netfx\System.Net.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Numerics">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netfx\System.Numerics.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Runtime.Serialization">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netfx\System.Runtime.Serialization.dll</HintPath>
+    </Reference>
+    <Reference Include="System.ServiceModel.Web">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netfx\System.ServiceModel.Web.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Transactions">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netfx\System.Transactions.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Web">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netfx\System.Web.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Windows">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netfx\System.Windows.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Xml">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netfx\System.Xml.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Xml.Linq">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netfx\System.Xml.Linq.dll</HintPath>
+    </Reference>
+    <Reference Include="System.Xml.Serialization">
+      <HintPath>C:\Program Files\Unity\Hub\Editor\2020.2.1f1\Editor\Data\NetStandard\compat\2.0.0\shims\netfx\System.Xml.Serialization.dll</HintPath>
+    </Reference>
+    <Reference Include="Unity.VSCode.Editor">
+      <HintPath>Library\ScriptAssemblies\Unity.VSCode.Editor.dll</HintPath>
+    </Reference>
+    <Reference Include="UnityEditor.CacheServer">
+      <HintPath>Library\ScriptAssemblies\UnityEditor.CacheServer.dll</HintPath>
+    </Reference>
+    <Reference Include="Unity.VisualStudio.Editor">
+      <HintPath>Library\ScriptAssemblies\Unity.VisualStudio.Editor.dll</HintPath>
+    </Reference>
+    <Reference Include="Unity.Addressables">
+      <HintPath>Library\ScriptAssemblies\Unity.Addressables.dll</HintPath>
+    </Reference>
+    <Reference Include="Unity.ScriptableBuildPipeline">
+      <HintPath>Library\ScriptAssemblies\Unity.ScriptableBuildPipeline.dll</HintPath>
+    </Reference>
+    <Reference Include="Unity.Addressables.Editor">
+      <HintPath>Library\ScriptAssemblies\Unity.Addressables.Editor.dll</HintPath>
+    </Reference>
+    <Reference Include="Unity.ScriptableBuildPipeline.Editor">
+      <HintPath>Library\ScriptAssemblies\Unity.ScriptableBuildPipeline.Editor.dll</HintPath>
+    </Reference>
+    <Reference Include="Unity.ResourceManager">
+      <HintPath>Library\ScriptAssemblies\Unity.ResourceManager.dll</HintPath>
+    </Reference>
+    <Reference Include="Unity.Rider.Editor">
+      <HintPath>Library\ScriptAssemblies\Unity.Rider.Editor.dll</HintPath>
+    </Reference>
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="UniTask.TextMeshPro.csproj">
+      <Project>{B5929667-6CB2-8779-D894-4F69110C1A43}</Project>
+      <Name>UniTask.TextMeshPro</Name>
+    </ProjectReference>
+    <ProjectReference Include="TempAsm.csproj">
+      <Project>{9E0EF10C-B6E1-E08E-3160-7162D66F7EE0}</Project>
+      <Name>TempAsm</Name>
+    </ProjectReference>
+    <ProjectReference Include="UniTask.DOTween.csproj">
+      <Project>{7121D833-D063-D143-CFFC-CD50DDF1B3D1}</Project>
+      <Name>UniTask.DOTween</Name>
+    </ProjectReference>
+    <ProjectReference Include="UniTask.Addressables.csproj">
+      <Project>{78124C71-0355-1FB9-3AEB-7D573CD8E7CA}</Project>
+      <Name>UniTask.Addressables</Name>
+    </ProjectReference>
+    <ProjectReference Include="UniTask.Linq.csproj">
+      <Project>{7F0F67EA-D985-C15F-AAE8-F643789B52A7}</Project>
+      <Name>UniTask.Linq</Name>
+    </ProjectReference>
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+  <Target Name="GenerateTargetFrameworkMonikerAttribute" />
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it.
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+</Project>

src/UniTask/Assets/Editor/EditorRunnerChecker.cs

@@ -20,8 +20,9 @@ public static class EditorRunnerChecker
     {
         Debug.Log("Start");
 
-        var r = await UnityWebRequest.Get("https://bing.com/").SendWebRequest().ToUniTask();
+        //var r = await UnityWebRequest.Get("https://bing.com/").SendWebRequest().ToUniTask();
-        Debug.Log(r.downloadHandler.text.Substring(0, 100));
+        //Debug.Log(r.downloadHandler.text.Substring(0, 100));
+        await UniTask.Yield();
 
         Debug.Log("End");
     }

src/UniTask/Assets/Plugins/UniTask/Editor/UniTask.Editor.asmdef

@@ -10,7 +10,7 @@
     "allowUnsafeCode": false,
     "overrideReferences": false,
     "precompiledReferences": [],
-    "autoReferenced": true,
+    "autoReferenced": false,
     "defineConstraints": [],
     "versionDefines": [],
     "noEngineReferences": false

src/UniTask/Assets/Plugins/UniTask/Runtime/AsyncLazy.cs

@@ -7,113 +7,239 @@ namespace Cysharp.Threading.Tasks
 {
     public class AsyncLazy
     {
-        Func<UniTask> valueFactory;
+        static Action<object> continuation = SetCompletionSource;
-        UniTask target;
+
+        Func<UniTask> taskFactory;
+        UniTaskCompletionSource completionSource;
+        UniTask.Awaiter awaiter;
+
         object syncLock;
         bool initialized;
 
-        public AsyncLazy(Func<UniTask> valueFactory)
+        public AsyncLazy(Func<UniTask> taskFactory)
         {
-            this.valueFactory = valueFactory;
+            this.taskFactory = taskFactory;
-            this.target = default;
+            this.completionSource = new UniTaskCompletionSource();
             this.syncLock = new object();
             this.initialized = false;
         }
 
-        internal AsyncLazy(UniTask value)
+        internal AsyncLazy(UniTask task)
         {
-            this.valueFactory = null;
+            this.taskFactory = null;
-            this.target = value;
+            this.completionSource = new UniTaskCompletionSource();
             this.syncLock = null;
             this.initialized = true;
+
+            var awaiter = task.GetAwaiter();
+            if (awaiter.IsCompleted)
+            {
+                SetCompletionSource(awaiter);
+            }
+            else
+            {
+                this.awaiter = awaiter;
+                awaiter.SourceOnCompleted(continuation, this);
+            }
         }
 
-        public UniTask Task => EnsureInitialized();
+        public UniTask Task
+        {
+            get
+            {
+                EnsureInitialized();
+                return completionSource.Task;
+            }
+        }
 
-        public UniTask.Awaiter GetAwaiter() => EnsureInitialized().GetAwaiter();
 
-        UniTask EnsureInitialized()
+        public UniTask.Awaiter GetAwaiter() => Task.GetAwaiter();
+
+        void EnsureInitialized()
         {
             if (Volatile.Read(ref initialized))
             {
-                return target;
+                return;
             }
 
-            return EnsureInitializedCore();
+            EnsureInitializedCore();
         }
 
-        UniTask EnsureInitializedCore()
+        void EnsureInitializedCore()
         {
             lock (syncLock)
             {
                 if (!Volatile.Read(ref initialized))
                 {
-                    var f = Interlocked.Exchange(ref valueFactory, null);
+                    var f = Interlocked.Exchange(ref taskFactory, null);
                     if (f != null)
                     {
-                        target = f().Preserve(); // with preserve(allow multiple await).
+                        var task = f();
+                        var awaiter = task.GetAwaiter();
+                        if (awaiter.IsCompleted)
+                        {
+                            SetCompletionSource(awaiter);
+                        }
+                        else
+                        {
+                            this.awaiter = awaiter;
+                            awaiter.SourceOnCompleted(continuation, this);
+                        }
+
                         Volatile.Write(ref initialized, true);
                     }
                 }
             }
+        }
 
-            return target;
+        void SetCompletionSource(in UniTask.Awaiter awaiter)
+        {
+            try
+            {
+                awaiter.GetResult();
+                completionSource.TrySetResult();
+            }
+            catch (Exception ex)
+            {
+                completionSource.TrySetException(ex);
+            }
+        }
+
+        static void SetCompletionSource(object state)
+        {
+            var self = (AsyncLazy)state;
+            try
+            {
+                self.awaiter.GetResult();
+                self.completionSource.TrySetResult();
+            }
+            catch (Exception ex)
+            {
+                self.completionSource.TrySetException(ex);
+            }
+            finally
+            {
+                self.awaiter = default;
+            }
         }
     }
 
     public class AsyncLazy<T>
     {
-        Func<UniTask<T>> valueFactory;
+        static Action<object> continuation = SetCompletionSource;
-        UniTask<T> target;
+
+        Func<UniTask<T>> taskFactory;
+        UniTaskCompletionSource<T> completionSource;
+        UniTask<T>.Awaiter awaiter;
+
         object syncLock;
         bool initialized;
 
-        public AsyncLazy(Func<UniTask<T>> valueFactory)
+        public AsyncLazy(Func<UniTask<T>> taskFactory)
         {
-            this.valueFactory = valueFactory;
+            this.taskFactory = taskFactory;
-            this.target = default;
+            this.completionSource = new UniTaskCompletionSource<T>();
             this.syncLock = new object();
             this.initialized = false;
         }
 
-        internal AsyncLazy(UniTask<T> value)
+        internal AsyncLazy(UniTask<T> task)
         {
-            this.valueFactory = null;
+            this.taskFactory = null;
-            this.target = value;
+            this.completionSource = new UniTaskCompletionSource<T>();
             this.syncLock = null;
             this.initialized = true;
+
+            var awaiter = task.GetAwaiter();
+            if (awaiter.IsCompleted)
+            {
+                SetCompletionSource(awaiter);
+            }
+            else
+            {
+                this.awaiter = awaiter;
+                awaiter.SourceOnCompleted(continuation, this);
+            }
         }
 
-        public UniTask<T> Task => EnsureInitialized();
+        public UniTask<T> Task
+        {
+            get
+            {
+                EnsureInitialized();
+                return completionSource.Task;
+            }
+        }
 
-        public UniTask<T>.Awaiter GetAwaiter() => EnsureInitialized().GetAwaiter();
 
-        UniTask<T> EnsureInitialized()
+        public UniTask<T>.Awaiter GetAwaiter() => Task.GetAwaiter();
+
+        void EnsureInitialized()
         {
             if (Volatile.Read(ref initialized))
             {
-                return target;
+                return;
             }
 
-            return EnsureInitializedCore();
+            EnsureInitializedCore();
         }
 
-        UniTask<T> EnsureInitializedCore()
+        void EnsureInitializedCore()
         {
             lock (syncLock)
             {
                 if (!Volatile.Read(ref initialized))
                 {
-                    var f = Interlocked.Exchange(ref valueFactory, null);
+                    var f = Interlocked.Exchange(ref taskFactory, null);
                     if (f != null)
                     {
-                        target = f().Preserve(); // with preserve(allow multiple await).
+                        var task = f();
+                        var awaiter = task.GetAwaiter();
+                        if (awaiter.IsCompleted)
+                        {
+                            SetCompletionSource(awaiter);
+                        }
+                        else
+                        {
+                            this.awaiter = awaiter;
+                            awaiter.SourceOnCompleted(continuation, this);
+                        }
+
                         Volatile.Write(ref initialized, true);
                     }
                 }
             }
+        }
 
-            return target;
+        void SetCompletionSource(in UniTask<T>.Awaiter awaiter)
+        {
+            try
+            {
+                var result = awaiter.GetResult();
+                completionSource.TrySetResult(result);
+            }
+            catch (Exception ex)
+            {
+                completionSource.TrySetException(ex);
+            }
+        }
+
+        static void SetCompletionSource(object state)
+        {
+            var self = (AsyncLazy<T>)state;
+            try
+            {
+                var result = self.awaiter.GetResult();
+                self.completionSource.TrySetResult(result);
+            }
+            catch (Exception ex)
+            {
+                self.completionSource.TrySetException(ex);
+            }
+            finally
+            {
+                self.awaiter = default;
+            }
         }
     }
 }

src/UniTask/Assets/Plugins/UniTask/Runtime/AsyncReactiveProperty.cs

@@ -1,5 +1,4 @@
-using Cysharp.Threading.Tasks.Linq;
+using System;
-using System;
 using System.Threading;
 
 namespace Cysharp.Threading.Tasks
@@ -8,6 +7,7 @@ namespace Cysharp.Threading.Tasks
     {
         T Value { get; }
         IUniTaskAsyncEnumerable<T> WithoutCurrent();
+        UniTask<T> WaitAsync(CancellationToken cancellationToken = default);
     }
 
     public interface IAsyncReactiveProperty<T> : IReadOnlyAsyncReactiveProperty<T>
@@ -70,6 +70,11 @@ namespace Cysharp.Threading.Tasks
             return latestValue?.ToString();
         }
 
+        public UniTask<T> WaitAsync(CancellationToken cancellationToken = default)
+        {
+            return new UniTask<T>(WaitAsyncSource.Create(this, cancellationToken, out var token), token);
+        }
+
         static bool isValueType;
 
         static AsyncReactiveProperty()
@@ -77,7 +82,136 @@ namespace Cysharp.Threading.Tasks
             isValueType = typeof(T).IsValueType;
         }
 
-        class WithoutCurrentEnumerable : IUniTaskAsyncEnumerable<T>
+        sealed class WaitAsyncSource : IUniTaskSource<T>, ITriggerHandler<T>, ITaskPoolNode<WaitAsyncSource>
+        {
+            static Action<object> cancellationCallback = CancellationCallback;
+
+            static TaskPool<WaitAsyncSource> pool;
+            WaitAsyncSource nextNode;
+            ref WaitAsyncSource ITaskPoolNode<WaitAsyncSource>.NextNode => ref nextNode;
+
+            static WaitAsyncSource()
+            {
+                TaskPool.RegisterSizeGetter(typeof(WaitAsyncSource), () => pool.Size);
+            }
+
+            AsyncReactiveProperty<T> parent;
+            CancellationToken cancellationToken;
+            CancellationTokenRegistration cancellationTokenRegistration;
+            UniTaskCompletionSourceCore<T> core;
+
+            WaitAsyncSource()
+            {
+            }
+
+            public static IUniTaskSource<T> Create(AsyncReactiveProperty<T> parent, CancellationToken cancellationToken, out short token)
+            {
+                if (cancellationToken.IsCancellationRequested)
+                {
+                    return AutoResetUniTaskCompletionSource<T>.CreateFromCanceled(cancellationToken, out token);
+                }
+
+                if (!pool.TryPop(out var result))
+                {
+                    result = new WaitAsyncSource();
+                }
+
+                result.parent = parent;
+                result.cancellationToken = cancellationToken;
+
+                if (cancellationToken.CanBeCanceled)
+                {
+                    result.cancellationTokenRegistration = cancellationToken.RegisterWithoutCaptureExecutionContext(cancellationCallback, result);
+                }
+
+                result.parent.triggerEvent.Add(result);
+
+                TaskTracker.TrackActiveTask(result, 3);
+
+                token = result.core.Version;
+                return result;
+            }
+
+            bool TryReturn()
+            {
+                TaskTracker.RemoveTracking(this);
+                core.Reset();
+                cancellationTokenRegistration.Dispose();
+                cancellationTokenRegistration = default;
+                parent.triggerEvent.Remove(this);
+                parent = null;
+                cancellationToken = default;
+                return pool.TryPush(this);
+            }
+
+            static void CancellationCallback(object state)
+            {
+                var self = (WaitAsyncSource)state;
+                self.OnCanceled(self.cancellationToken);
+            }
+
+            // IUniTaskSource
+
+            public T GetResult(short token)
+            {
+                try
+                {
+                    return core.GetResult(token);
+                }
+                finally
+                {
+                    TryReturn();
+                }
+            }
+
+            void IUniTaskSource.GetResult(short token)
+            {
+                GetResult(token);
+            }
+
+            public void OnCompleted(Action<object> continuation, object state, short token)
+            {
+                core.OnCompleted(continuation, state, token);
+            }
+
+            public UniTaskStatus GetStatus(short token)
+            {
+                return core.GetStatus(token);
+            }
+
+            public UniTaskStatus UnsafeGetStatus()
+            {
+                return core.UnsafeGetStatus();
+            }
+
+            // ITriggerHandler
+
+            ITriggerHandler<T> ITriggerHandler<T>.Prev { get; set; }
+            ITriggerHandler<T> ITriggerHandler<T>.Next { get; set; }
+
+            public void OnCanceled(CancellationToken cancellationToken)
+            {
+                core.TrySetCanceled(cancellationToken);
+            }
+
+            public void OnCompleted()
+            {
+                // Complete as Cancel.
+                core.TrySetCanceled(CancellationToken.None);
+            }
+
+            public void OnError(Exception ex)
+            {
+                core.TrySetException(ex);
+            }
+
+            public void OnNext(T value)
+            {
+                core.TrySetResult(value);
+            }
+        }
+
+        sealed class WithoutCurrentEnumerable : IUniTaskAsyncEnumerable<T>
         {
             readonly AsyncReactiveProperty<T> parent;
 
@@ -120,6 +254,9 @@ namespace Cysharp.Threading.Tasks
 
             public T Current => value;
 
+            ITriggerHandler<T> ITriggerHandler<T>.Prev { get; set; }
+            ITriggerHandler<T> ITriggerHandler<T>.Next { get; set; }
+
             public UniTask<bool> MoveNextAsync()
             {
                 // raise latest value on first call.
@@ -251,6 +388,11 @@ namespace Cysharp.Threading.Tasks
             return latestValue?.ToString();
         }
 
+        public UniTask<T> WaitAsync(CancellationToken cancellationToken = default)
+        {
+            return new UniTask<T>(WaitAsyncSource.Create(this, cancellationToken, out var token), token);
+        }
+
         static bool isValueType;
 
         static ReadOnlyAsyncReactiveProperty()
@@ -258,7 +400,136 @@ namespace Cysharp.Threading.Tasks
             isValueType = typeof(T).IsValueType;
         }
 
-        class WithoutCurrentEnumerable : IUniTaskAsyncEnumerable<T>
+        sealed class WaitAsyncSource : IUniTaskSource<T>, ITriggerHandler<T>, ITaskPoolNode<WaitAsyncSource>
+        {
+            static Action<object> cancellationCallback = CancellationCallback;
+
+            static TaskPool<WaitAsyncSource> pool;
+            WaitAsyncSource nextNode;
+            ref WaitAsyncSource ITaskPoolNode<WaitAsyncSource>.NextNode => ref nextNode;
+
+            static WaitAsyncSource()
+            {
+                TaskPool.RegisterSizeGetter(typeof(WaitAsyncSource), () => pool.Size);
+            }
+
+            ReadOnlyAsyncReactiveProperty<T> parent;
+            CancellationToken cancellationToken;
+            CancellationTokenRegistration cancellationTokenRegistration;
+            UniTaskCompletionSourceCore<T> core;
+
+            WaitAsyncSource()
+            {
+            }
+
+            public static IUniTaskSource<T> Create(ReadOnlyAsyncReactiveProperty<T> parent, CancellationToken cancellationToken, out short token)
+            {
+                if (cancellationToken.IsCancellationRequested)
+                {
+                    return AutoResetUniTaskCompletionSource<T>.CreateFromCanceled(cancellationToken, out token);
+                }
+
+                if (!pool.TryPop(out var result))
+                {
+                    result = new WaitAsyncSource();
+                }
+
+                result.parent = parent;
+                result.cancellationToken = cancellationToken;
+
+                if (cancellationToken.CanBeCanceled)
+                {
+                    result.cancellationTokenRegistration = cancellationToken.RegisterWithoutCaptureExecutionContext(cancellationCallback, result);
+                }
+
+                result.parent.triggerEvent.Add(result);
+
+                TaskTracker.TrackActiveTask(result, 3);
+
+                token = result.core.Version;
+                return result;
+            }
+
+            bool TryReturn()
+            {
+                TaskTracker.RemoveTracking(this);
+                core.Reset();
+                cancellationTokenRegistration.Dispose();
+                cancellationTokenRegistration = default;
+                parent.triggerEvent.Remove(this);
+                parent = null;
+                cancellationToken = default;
+                return pool.TryPush(this);
+            }
+
+            static void CancellationCallback(object state)
+            {
+                var self = (WaitAsyncSource)state;
+                self.OnCanceled(self.cancellationToken);
+            }
+
+            // IUniTaskSource
+
+            public T GetResult(short token)
+            {
+                try
+                {
+                    return core.GetResult(token);
+                }
+                finally
+                {
+                    TryReturn();
+                }
+            }
+
+            void IUniTaskSource.GetResult(short token)
+            {
+                GetResult(token);
+            }
+
+            public void OnCompleted(Action<object> continuation, object state, short token)
+            {
+                core.OnCompleted(continuation, state, token);
+            }
+
+            public UniTaskStatus GetStatus(short token)
+            {
+                return core.GetStatus(token);
+            }
+
+            public UniTaskStatus UnsafeGetStatus()
+            {
+                return core.UnsafeGetStatus();
+            }
+
+            // ITriggerHandler
+
+            ITriggerHandler<T> ITriggerHandler<T>.Prev { get; set; }
+            ITriggerHandler<T> ITriggerHandler<T>.Next { get; set; }
+
+            public void OnCanceled(CancellationToken cancellationToken)
+            {
+                core.TrySetCanceled(cancellationToken);
+            }
+
+            public void OnCompleted()
+            {
+                // Complete as Cancel.
+                core.TrySetCanceled(CancellationToken.None);
+            }
+
+            public void OnError(Exception ex)
+            {
+                core.TrySetException(ex);
+            }
+
+            public void OnNext(T value)
+            {
+                core.TrySetResult(value);
+            }
+        }
+
+        sealed class WithoutCurrentEnumerable : IUniTaskAsyncEnumerable<T>
         {
             readonly ReadOnlyAsyncReactiveProperty<T> parent;
 
@@ -300,6 +571,8 @@ namespace Cysharp.Threading.Tasks
             }
 
             public T Current => value;
+            ITriggerHandler<T> ITriggerHandler<T>.Prev { get; set; }
+            ITriggerHandler<T> ITriggerHandler<T>.Next { get; set; }
 
             public UniTask<bool> MoveNextAsync()
             {

src/UniTask/Assets/Plugins/UniTask/Runtime/CancellationTokenExtensions.cs

@@ -9,6 +9,56 @@ namespace Cysharp.Threading.Tasks
     public static class CancellationTokenExtensions
     {
         static readonly Action<object> cancellationTokenCallback = Callback;
+        static readonly Action<object> disposeCallback = DisposeCallback;
+
+        public static CancellationToken ToCancellationToken(this UniTask task)
+        {
+            var cts = new CancellationTokenSource();
+            ToCancellationTokenCore(task, cts).Forget();
+            return cts.Token;
+        }
+
+        public static CancellationToken ToCancellationToken(this UniTask task, CancellationToken linkToken)
+        {
+            if (linkToken.IsCancellationRequested)
+            {
+                return linkToken;
+            }
+
+            if (!linkToken.CanBeCanceled)
+            {
+                return ToCancellationToken(task);
+            }
+
+            var cts = CancellationTokenSource.CreateLinkedTokenSource(linkToken);
+            ToCancellationTokenCore(task, cts).Forget();
+
+            return cts.Token;
+        }
+
+        public static CancellationToken ToCancellationToken<T>(this UniTask<T> task)
+        {
+            return ToCancellationToken(task.AsUniTask());
+        }
+
+        public static CancellationToken ToCancellationToken<T>(this UniTask<T> task, CancellationToken linkToken)
+        {
+            return ToCancellationToken(task.AsUniTask(), linkToken);
+        }
+
+        static async UniTaskVoid ToCancellationTokenCore(UniTask task, CancellationTokenSource cts)
+        {
+            try
+            {
+                await task;
+            }
+            catch (Exception ex)
+            {
+                UniTaskScheduler.PublishUnobservedTaskException(ex);
+            }
+            cts.Cancel();
+            cts.Dispose();
+        }
 
         public static (UniTask, CancellationTokenRegistration) ToUniTask(this CancellationToken cancellationToken)
         {
@@ -75,6 +125,17 @@ namespace Cysharp.Threading.Tasks
                 }
             }
         }
+
+        public static CancellationTokenRegistration AddTo(this IDisposable disposable, CancellationToken cancellationToken)
+        {
+            return cancellationToken.RegisterWithoutCaptureExecutionContext(disposeCallback, disposable);
+        }
+
+        static void DisposeCallback(object state)
+        {
+            var d = (IDisposable)state;
+            d.Dispose();
+        }
     }
 
     public struct CancellationTokenAwaitable

src/UniTask/Assets/Plugins/UniTask/Runtime/CancellationTokenSourceExtensions.cs

@@ -9,15 +9,15 @@ namespace Cysharp.Threading.Tasks
 {
     public static class CancellationTokenSourceExtensions
     {
-        public static void CancelAfterSlim(this CancellationTokenSource cts, int millisecondsDelay, bool ignoreTimeScale = false, PlayerLoopTiming delayTiming = PlayerLoopTiming.Update)
+        public static void CancelAfterSlim(this CancellationTokenSource cts, int millisecondsDelay, DelayType delayType = DelayType.DeltaTime, PlayerLoopTiming delayTiming = PlayerLoopTiming.Update)
         {
-            var delay = UniTask.Delay(millisecondsDelay, ignoreTimeScale, delayTiming, cts.Token);
+            var delay = UniTask.Delay(millisecondsDelay, delayType, delayTiming, cts.Token);
             CancelAfterCore(cts, delay).Forget();
         }
 
-        public static void CancelAfterSlim(this CancellationTokenSource cts, TimeSpan delayTimeSpan, bool ignoreTimeScale = false, PlayerLoopTiming delayTiming = PlayerLoopTiming.Update)
+        public static void CancelAfterSlim(this CancellationTokenSource cts, TimeSpan delayTimeSpan, DelayType delayType = DelayType.DeltaTime, PlayerLoopTiming delayTiming = PlayerLoopTiming.Update)
         {
-            var delay = UniTask.Delay(delayTimeSpan, ignoreTimeScale, delayTiming, cts.Token);
+            var delay = UniTask.Delay(delayTimeSpan, delayType, delayTiming, cts.Token);
             CancelAfterCore(cts, delay).Forget();
         }
 

src/UniTask/Assets/Plugins/UniTask/Runtime/CompilerServices/AsyncUniTaskMethodBuilder.cs

@@ -12,7 +12,7 @@ namespace Cysharp.Threading.Tasks.CompilerServices
     [StructLayout(LayoutKind.Auto)]
     public struct AsyncUniTaskMethodBuilder
     {
-        internal IMoveNextRunnerPromise runnerPromise;
+        IStateMachineRunnerPromise runnerPromise;
         Exception ex;
 
         // 1. Static Create method.
@@ -47,6 +47,7 @@ namespace Cysharp.Threading.Tasks.CompilerServices
 
         // 3. SetException
         [DebuggerHidden]
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public void SetException(Exception exception)
         {
             if (runnerPromise == null)
@@ -61,6 +62,7 @@ namespace Cysharp.Threading.Tasks.CompilerServices
 
         // 4. SetResult
         [DebuggerHidden]
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public void SetResult()
         {
             if (runnerPromise != null)
@@ -71,13 +73,14 @@ namespace Cysharp.Threading.Tasks.CompilerServices
 
         // 5. AwaitOnCompleted
         [DebuggerHidden]
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public void AwaitOnCompleted<TAwaiter, TStateMachine>(ref TAwaiter awaiter, ref TStateMachine stateMachine)
             where TAwaiter : INotifyCompletion
             where TStateMachine : IAsyncStateMachine
         {
             if (runnerPromise == null)
             {
-                AsyncUniTask<TStateMachine>.SetStateMachine(ref this, ref stateMachine);
+                AsyncUniTask<TStateMachine>.SetStateMachine(ref stateMachine, ref runnerPromise);
             }
 
             awaiter.OnCompleted(runnerPromise.MoveNext);
@@ -86,13 +89,14 @@ namespace Cysharp.Threading.Tasks.CompilerServices
         // 6. AwaitUnsafeOnCompleted
         [DebuggerHidden]
         [SecuritySafeCritical]
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public void AwaitUnsafeOnCompleted<TAwaiter, TStateMachine>(ref TAwaiter awaiter, ref TStateMachine stateMachine)
             where TAwaiter : ICriticalNotifyCompletion
             where TStateMachine : IAsyncStateMachine
         {
             if (runnerPromise == null)
             {
-                AsyncUniTask<TStateMachine>.SetStateMachine(ref this, ref stateMachine);
+                AsyncUniTask<TStateMachine>.SetStateMachine(ref stateMachine, ref runnerPromise);
             }
 
             awaiter.UnsafeOnCompleted(runnerPromise.MoveNext);
@@ -100,6 +104,7 @@ namespace Cysharp.Threading.Tasks.CompilerServices
 
         // 7. Start
         [DebuggerHidden]
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public void Start<TStateMachine>(ref TStateMachine stateMachine)
             where TStateMachine : IAsyncStateMachine
         {
@@ -133,7 +138,7 @@ namespace Cysharp.Threading.Tasks.CompilerServices
     [StructLayout(LayoutKind.Auto)]
     public struct AsyncUniTaskMethodBuilder<T>
     {
-        internal IMoveNextRunnerPromise<T> runnerPromise;
+        IStateMachineRunnerPromise<T> runnerPromise;
         Exception ex;
         T result;
 
@@ -146,9 +151,10 @@ namespace Cysharp.Threading.Tasks.CompilerServices
         }
 
         // 2. TaskLike Task property.
-        [DebuggerHidden]
         public UniTask<T> Task
         {
+            [DebuggerHidden]
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
             get
             {
                 if (runnerPromise != null)
@@ -168,6 +174,7 @@ namespace Cysharp.Threading.Tasks.CompilerServices
 
         // 3. SetException
         [DebuggerHidden]
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public void SetException(Exception exception)
         {
             if (runnerPromise == null)
@@ -182,6 +189,7 @@ namespace Cysharp.Threading.Tasks.CompilerServices
 
         // 4. SetResult
         [DebuggerHidden]
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public void SetResult(T result)
         {
             if (runnerPromise == null)
@@ -196,13 +204,14 @@ namespace Cysharp.Threading.Tasks.CompilerServices
 
         // 5. AwaitOnCompleted
         [DebuggerHidden]
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public void AwaitOnCompleted<TAwaiter, TStateMachine>(ref TAwaiter awaiter, ref TStateMachine stateMachine)
             where TAwaiter : INotifyCompletion
             where TStateMachine : IAsyncStateMachine
         {
             if (runnerPromise == null)
             {
-                AsyncUniTask<TStateMachine, T>.SetStateMachine(ref this, ref stateMachine);
+                AsyncUniTask<TStateMachine, T>.SetStateMachine(ref stateMachine, ref runnerPromise);
             }
 
             awaiter.OnCompleted(runnerPromise.MoveNext);
@@ -211,13 +220,14 @@ namespace Cysharp.Threading.Tasks.CompilerServices
         // 6. AwaitUnsafeOnCompleted
         [DebuggerHidden]
         [SecuritySafeCritical]
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public void AwaitUnsafeOnCompleted<TAwaiter, TStateMachine>(ref TAwaiter awaiter, ref TStateMachine stateMachine)
             where TAwaiter : ICriticalNotifyCompletion
             where TStateMachine : IAsyncStateMachine
         {
             if (runnerPromise == null)
             {
-                AsyncUniTask<TStateMachine, T>.SetStateMachine(ref this, ref stateMachine);
+                AsyncUniTask<TStateMachine, T>.SetStateMachine(ref stateMachine, ref runnerPromise);
             }
 
             awaiter.UnsafeOnCompleted(runnerPromise.MoveNext);
@@ -225,6 +235,7 @@ namespace Cysharp.Threading.Tasks.CompilerServices
 
         // 7. Start
         [DebuggerHidden]
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public void Start<TStateMachine>(ref TStateMachine stateMachine)
             where TStateMachine : IAsyncStateMachine
         {

src/UniTask/Assets/Plugins/UniTask/Runtime/CompilerServices/AsyncUniTaskVoidMethodBuilder.cs

@@ -12,7 +12,7 @@ namespace Cysharp.Threading.Tasks.CompilerServices
     [StructLayout(LayoutKind.Auto)]
     public struct AsyncUniTaskVoidMethodBuilder
     {
-        internal IMoveNextRunner runner;
+        IStateMachineRunner runner;
 
         // 1. Static Create method.
         [DebuggerHidden]
@@ -35,12 +35,18 @@ namespace Cysharp.Threading.Tasks.CompilerServices
 
         // 3. SetException
         [DebuggerHidden]
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public void SetException(Exception exception)
         {
             // runner is finished, return first.
             if (runner != null)
             {
+#if ENABLE_IL2CPP
+                // workaround for IL2CPP bug.
+                PlayerLoopHelper.AddContinuation(PlayerLoopTiming.LastPostLateUpdate, runner.ReturnAction);
+#else
                 runner.Return();
+#endif
                 runner = null;
             }
 
@@ -49,25 +55,32 @@ namespace Cysharp.Threading.Tasks.CompilerServices
 
         // 4. SetResult
         [DebuggerHidden]
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public void SetResult()
         {
             // runner is finished, return.
             if (runner != null)
             {
+#if ENABLE_IL2CPP
+                // workaround for IL2CPP bug.
+                PlayerLoopHelper.AddContinuation(PlayerLoopTiming.LastPostLateUpdate, runner.ReturnAction);
+#else
                 runner.Return();
+#endif
                 runner = null;
             }
         }
 
         // 5. AwaitOnCompleted
         [DebuggerHidden]
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public void AwaitOnCompleted<TAwaiter, TStateMachine>(ref TAwaiter awaiter, ref TStateMachine stateMachine)
             where TAwaiter : INotifyCompletion
             where TStateMachine : IAsyncStateMachine
         {
             if (runner == null)
             {
-                AsyncUniTaskVoid<TStateMachine>.SetStateMachine(ref this, ref stateMachine);
+                AsyncUniTaskVoid<TStateMachine>.SetStateMachine(ref stateMachine, ref runner);
             }
 
             awaiter.OnCompleted(runner.MoveNext);
@@ -76,13 +89,14 @@ namespace Cysharp.Threading.Tasks.CompilerServices
         // 6. AwaitUnsafeOnCompleted
         [DebuggerHidden]
         [SecuritySafeCritical]
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public void AwaitUnsafeOnCompleted<TAwaiter, TStateMachine>(ref TAwaiter awaiter, ref TStateMachine stateMachine)
             where TAwaiter : ICriticalNotifyCompletion
             where TStateMachine : IAsyncStateMachine
         {
             if (runner == null)
             {
-                AsyncUniTaskVoid<TStateMachine>.SetStateMachine(ref this, ref stateMachine);
+                AsyncUniTaskVoid<TStateMachine>.SetStateMachine(ref stateMachine, ref runner);
             }
 
             awaiter.UnsafeOnCompleted(runner.MoveNext);

src/UniTask/Assets/Plugins/UniTask/Runtime/CompilerServices/StateMachineRunner.cs

@@ -1,19 +1,28 @@
-#pragma warning disable CS1591 // Missing XML comment for publicly visible type or member
+#pragma warning disable CS1591
 
 using Cysharp.Threading.Tasks.Internal;
 using System;
+using System.Linq;
 using System.Diagnostics;
 using System.Runtime.CompilerServices;
 
 namespace Cysharp.Threading.Tasks.CompilerServices
 {
-    public interface IMoveNextRunner
+    // #ENABLE_IL2CPP in this file is to avoid bug of IL2CPP VM.
+    // Issue is tracked on https://issuetracker.unity3d.com/issues/il2cpp-incorrect-results-when-calling-a-method-from-outside-class-in-a-struct
+    // but currently it is labeled `Won't Fix`.
+
+    internal interface IStateMachineRunner
     {
         Action MoveNext { get; }
         void Return();
+
+#if ENABLE_IL2CPP
+        Action ReturnAction { get; }
+#endif
     }
 
-    internal interface IMoveNextRunnerPromise : IUniTaskSource
+    internal interface IStateMachineRunnerPromise : IUniTaskSource
     {
         Action MoveNext { get; }
         UniTask Task { get; }
@@ -21,7 +30,7 @@ namespace Cysharp.Threading.Tasks.CompilerServices
         void SetException(Exception exception);
     }
 
-    internal interface IMoveNextRunnerPromise<T> : IUniTaskSource<T>
+    internal interface IStateMachineRunnerPromise<T> : IUniTaskSource<T>
     {
         Action MoveNext { get; }
         UniTask<T> Task { get; }
@@ -29,11 +38,26 @@ namespace Cysharp.Threading.Tasks.CompilerServices
         void SetException(Exception exception);
     }
 
-    internal sealed class AsyncUniTaskVoid<TStateMachine> : IMoveNextRunner, ITaskPoolNode<AsyncUniTaskVoid<TStateMachine>>, IUniTaskSource
+    internal static class StateMachineUtility
+    {
+        // Get AsyncStateMachine internal state to check IL2CPP bug
+        public static int GetState(IAsyncStateMachine stateMachine)
+        {
+            var info = stateMachine.GetType().GetFields(System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance)
+                .First(x => x.Name.EndsWith("__state"));
+            return (int)info.GetValue(stateMachine);
+        }
+    }
+
+    internal sealed class AsyncUniTaskVoid<TStateMachine> : IStateMachineRunner, ITaskPoolNode<AsyncUniTaskVoid<TStateMachine>>, IUniTaskSource
         where TStateMachine : IAsyncStateMachine
     {
         static TaskPool<AsyncUniTaskVoid<TStateMachine>> pool;
 
+#if ENABLE_IL2CPP
+        public Action ReturnAction { get; }
+#endif
+
         TStateMachine stateMachine;
 
         public Action MoveNext { get; }
@@ -41,9 +65,12 @@ namespace Cysharp.Threading.Tasks.CompilerServices
         public AsyncUniTaskVoid()
         {
             MoveNext = Run;
+#if ENABLE_IL2CPP
+            ReturnAction = Return;
+#endif
         }
 
-        public static void SetStateMachine(ref AsyncUniTaskVoidMethodBuilder builder, ref TStateMachine stateMachine)
+        public static void SetStateMachine(ref TStateMachine stateMachine, ref IStateMachineRunner runnerFieldRef)
         {
             if (!pool.TryPop(out var result))
             {
@@ -51,16 +78,17 @@ namespace Cysharp.Threading.Tasks.CompilerServices
             }
             TaskTracker.TrackActiveTask(result, 3);
 
-            builder.runner = result; // set runner before copied.
+            runnerFieldRef = result; // set runner before copied.
             result.stateMachine = stateMachine; // copy struct StateMachine(in release build).
         }
 
         static AsyncUniTaskVoid()
         {
-            TaskPoolMonitor.RegisterSizeGetter(typeof(AsyncUniTaskVoid<TStateMachine>), () => pool.Size);
+            TaskPool.RegisterSizeGetter(typeof(AsyncUniTaskVoid<TStateMachine>), () => pool.Size);
         }
 
-        public AsyncUniTaskVoid<TStateMachine> NextNode { get; set; }
+        AsyncUniTaskVoid<TStateMachine> nextNode;
+        public ref AsyncUniTaskVoid<TStateMachine> NextNode => ref nextNode;
 
         public void Return()
         {
@@ -97,23 +125,28 @@ namespace Cysharp.Threading.Tasks.CompilerServices
         }
     }
 
-    internal sealed class AsyncUniTask<TStateMachine> : IMoveNextRunnerPromise, IUniTaskSource, ITaskPoolNode<AsyncUniTask<TStateMachine>>
+    internal sealed class AsyncUniTask<TStateMachine> : IStateMachineRunnerPromise, IUniTaskSource, ITaskPoolNode<AsyncUniTask<TStateMachine>>
         where TStateMachine : IAsyncStateMachine
     {
         static TaskPool<AsyncUniTask<TStateMachine>> pool;
 
-        TStateMachine stateMachine;
+#if ENABLE_IL2CPP
-
+        readonly Action returnDelegate;  
+#endif
         public Action MoveNext { get; }
 
+        TStateMachine stateMachine;
         UniTaskCompletionSourceCore<AsyncUnit> core;
 
         AsyncUniTask()
         {
             MoveNext = Run;
+#if ENABLE_IL2CPP
+            returnDelegate = Return;
+#endif
         }
 
-        public static void SetStateMachine(ref AsyncUniTaskMethodBuilder builder, ref TStateMachine stateMachine)
+        public static void SetStateMachine(ref TStateMachine stateMachine, ref IStateMachineRunnerPromise runnerPromiseFieldRef)
         {
             if (!pool.TryPop(out var result))
             {
@@ -121,15 +154,24 @@ namespace Cysharp.Threading.Tasks.CompilerServices
             }
             TaskTracker.TrackActiveTask(result, 3);
 
-            builder.runnerPromise = result; // set runner before copied.
+            runnerPromiseFieldRef = result; // set runner before copied.
             result.stateMachine = stateMachine; // copy struct StateMachine(in release build).
         }
 
-        public AsyncUniTask<TStateMachine> NextNode { get; set; }
+        AsyncUniTask<TStateMachine> nextNode;
+        public ref AsyncUniTask<TStateMachine> NextNode => ref nextNode;
 
         static AsyncUniTask()
         {
-            TaskPoolMonitor.RegisterSizeGetter(typeof(AsyncUniTask<TStateMachine>), () => pool.Size);
+            TaskPool.RegisterSizeGetter(typeof(AsyncUniTask<TStateMachine>), () => pool.Size);
+        }
+
+        void Return()
+        {
+            TaskTracker.RemoveTracking(this);
+            core.Reset();
+            stateMachine = default;
+            pool.TryPush(this);
         }
 
         bool TryReturn()
@@ -177,7 +219,12 @@ namespace Cysharp.Threading.Tasks.CompilerServices
             }
             finally
             {
+#if ENABLE_IL2CPP
+                // workaround for IL2CPP bug.
+                PlayerLoopHelper.AddContinuation(PlayerLoopTiming.LastPostLateUpdate, returnDelegate);
+#else
                 TryReturn();
+#endif
             }
         }
 
@@ -198,33 +245,31 @@ namespace Cysharp.Threading.Tasks.CompilerServices
         {
             core.OnCompleted(continuation, state, token);
         }
-
-        ~AsyncUniTask()
-        {
-            if (TryReturn())
-            {
-                GC.ReRegisterForFinalize(this);
-            }
-        }
     }
 
-    internal sealed class AsyncUniTask<TStateMachine, T> : IMoveNextRunnerPromise<T>, IUniTaskSource<T>, ITaskPoolNode<AsyncUniTask<TStateMachine, T>>
+    internal sealed class AsyncUniTask<TStateMachine, T> : IStateMachineRunnerPromise<T>, IUniTaskSource<T>, ITaskPoolNode<AsyncUniTask<TStateMachine, T>>
         where TStateMachine : IAsyncStateMachine
     {
         static TaskPool<AsyncUniTask<TStateMachine, T>> pool;
 
-        TStateMachine stateMachine;
+#if ENABLE_IL2CPP
+        readonly Action returnDelegate;  
+#endif
 
         public Action MoveNext { get; }
 
+        TStateMachine stateMachine;
         UniTaskCompletionSourceCore<T> core;
 
         AsyncUniTask()
         {
             MoveNext = Run;
+#if ENABLE_IL2CPP
+            returnDelegate = Return;
+#endif
         }
 
-        public static void SetStateMachine(ref AsyncUniTaskMethodBuilder<T> builder, ref TStateMachine stateMachine)
+        public static void SetStateMachine(ref TStateMachine stateMachine, ref IStateMachineRunnerPromise<T> runnerPromiseFieldRef)
         {
             if (!pool.TryPop(out var result))
             {
@@ -232,15 +277,24 @@ namespace Cysharp.Threading.Tasks.CompilerServices
             }
             TaskTracker.TrackActiveTask(result, 3);
 
-            builder.runnerPromise = result; // set runner before copied.
+            runnerPromiseFieldRef = result; // set runner before copied.
             result.stateMachine = stateMachine; // copy struct StateMachine(in release build).
         }
 
-        public AsyncUniTask<TStateMachine, T> NextNode { get; set; }
+        AsyncUniTask<TStateMachine, T> nextNode;
+        public ref AsyncUniTask<TStateMachine, T> NextNode => ref nextNode;
 
         static AsyncUniTask()
         {
-            TaskPoolMonitor.RegisterSizeGetter(typeof(AsyncUniTask<TStateMachine, T>), () => pool.Size);
+            TaskPool.RegisterSizeGetter(typeof(AsyncUniTask<TStateMachine, T>), () => pool.Size);
+        }
+
+        void Return()
+        {
+            TaskTracker.RemoveTracking(this);
+            core.Reset();
+            stateMachine = default;
+            pool.TryPush(this);
         }
 
         bool TryReturn()
@@ -255,6 +309,7 @@ namespace Cysharp.Threading.Tasks.CompilerServices
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         void Run()
         {
+            // UnityEngine.Debug.Log($"MoveNext State:" + StateMachineUtility.GetState(stateMachine));
             stateMachine.MoveNext();
         }
 
@@ -288,7 +343,12 @@ namespace Cysharp.Threading.Tasks.CompilerServices
             }
             finally
             {
+#if ENABLE_IL2CPP
+                // workaround for IL2CPP bug.
+                PlayerLoopHelper.AddContinuation(PlayerLoopTiming.LastPostLateUpdate, returnDelegate);
+#else
                 TryReturn();
+#endif
             }
         }
 
@@ -315,14 +375,6 @@ namespace Cysharp.Threading.Tasks.CompilerServices
         {
             core.OnCompleted(continuation, state, token);
         }
-
-        ~AsyncUniTask()
-        {
-            if (TryReturn())
-            {
-                GC.ReRegisterForFinalize(this);
-            }
-        }
     }
 }
 

src/UniTask/Assets/Plugins/UniTask/Runtime/EnumeratorAsyncExtensions.cs

@@ -12,10 +12,12 @@ namespace Cysharp.Threading.Tasks
 {
     public static class EnumeratorAsyncExtensions
     {
-        public static UniTask.Awaiter GetAwaiter(this IEnumerator enumerator)
+        public static UniTask.Awaiter GetAwaiter<T>(this T enumerator)
+            where T : IEnumerator
         {
-            Error.ThrowArgumentNullException(enumerator, nameof(enumerator));
+            var e = (IEnumerator)enumerator;
-            return new UniTask(EnumeratorPromise.Create(enumerator, PlayerLoopTiming.Update, CancellationToken.None, out var token), token).GetAwaiter();
+            Error.ThrowArgumentNullException(e, nameof(enumerator));
+            return new UniTask(EnumeratorPromise.Create(e, PlayerLoopTiming.Update, CancellationToken.None, out var token), token).GetAwaiter();
         }
 
         public static UniTask WithCancellation(this IEnumerator enumerator, CancellationToken cancellationToken)
@@ -30,18 +32,35 @@ namespace Cysharp.Threading.Tasks
             return new UniTask(EnumeratorPromise.Create(enumerator, timing, cancellationToken, out var token), token);
         }
 
+        public static UniTask ToUniTask(this IEnumerator enumerator, MonoBehaviour coroutineRunner)
+        {
+            var source = AutoResetUniTaskCompletionSource.Create();
+            coroutineRunner.StartCoroutine(Core(enumerator, coroutineRunner, source));
+            return source.Task;
+        }
+
+        static IEnumerator Core(IEnumerator inner, MonoBehaviour coroutineRunner, AutoResetUniTaskCompletionSource source)
+        {
+            yield return coroutineRunner.StartCoroutine(inner);
+            source.TrySetResult();
+        }
+
         sealed class EnumeratorPromise : IUniTaskSource, IPlayerLoopItem, ITaskPoolNode<EnumeratorPromise>
         {
             static TaskPool<EnumeratorPromise> pool;
-            public EnumeratorPromise NextNode { get; set; }
+            EnumeratorPromise nextNode;
+            public ref EnumeratorPromise NextNode => ref nextNode;
 
             static EnumeratorPromise()
             {
-                TaskPoolMonitor.RegisterSizeGetter(typeof(EnumeratorPromise), () => pool.Size);
+                TaskPool.RegisterSizeGetter(typeof(EnumeratorPromise), () => pool.Size);
             }
 
             IEnumerator innerEnumerator;
             CancellationToken cancellationToken;
+            int initialFrame;
+            bool loopRunning;
+            bool calledGetResult;
 
             UniTaskCompletionSourceCore<object> core;
 
@@ -64,10 +83,18 @@ namespace Cysharp.Threading.Tasks
 
                 result.innerEnumerator = ConsumeEnumerator(innerEnumerator);
                 result.cancellationToken = cancellationToken;
-
+                result.loopRunning = true;
-                PlayerLoopHelper.AddAction(timing, result);
+                result.calledGetResult = false;
+                result.initialFrame = -1;
 
                 token = result.core.Version;
+
+                // run immediately.
+                if (result.MoveNext())
+                {
+                    PlayerLoopHelper.AddAction(timing, result);
+                }
+                
                 return result;
             }
 
@@ -75,11 +102,15 @@ namespace Cysharp.Threading.Tasks
             {
                 try
                 {
+                    calledGetResult = true;
                     core.GetResult(token);
                 }
                 finally
                 {
-                    TryReturn();
+                    if (!loopRunning)
+                    {
+                        TryReturn();
+                    }
                 }
             }
 
@@ -100,12 +131,38 @@ namespace Cysharp.Threading.Tasks
 
             public bool MoveNext()
             {
+                if (calledGetResult)
+                {
+                    loopRunning = false;
+                    TryReturn();
+                    return false;
+                }
+
+                if (innerEnumerator == null) // invalid status, returned but loop running?
+                {
+                    return false;
+                }
+
                 if (cancellationToken.IsCancellationRequested)
                 {
+                    loopRunning = false;
                     core.TrySetCanceled(cancellationToken);
                     return false;
                 }
 
+                if (initialFrame == -1)
+                {
+                    // Time can not touch in threadpool.
+                    if (PlayerLoopHelper.IsMainThread)
+                    {
+                        initialFrame = Time.frameCount;
+                    }
+                }
+                else if (initialFrame == Time.frameCount)
+                {
+                    return true; // already executed in first frame, skip.
+                }
+
                 try
                 {
                     if (innerEnumerator.MoveNext())
@@ -115,10 +172,12 @@ namespace Cysharp.Threading.Tasks
                 }
                 catch (Exception ex)
                 {
+                    loopRunning = false;
                     core.TrySetException(ex);
                     return false;
                 }
 
+                loopRunning = false;
                 core.TrySetResult(null);
                 return false;
             }
@@ -129,15 +188,8 @@ namespace Cysharp.Threading.Tasks
                 core.Reset();
                 innerEnumerator = default;
                 cancellationToken = default;
-                return pool.TryPush(this);
-            }
 
-            ~EnumeratorPromise()
+                return pool.TryPush(this);
-            {
-                if (TryReturn())
-                {
-                    GC.ReRegisterForFinalize(this);
-                }
             }
 
             // Unwrap YieldInstructions
@@ -151,11 +203,10 @@ namespace Cysharp.Threading.Tasks
                     {
                         yield return null;
                     }
-                    else if (current is CustomYieldInstruction)
+                    else if (current is CustomYieldInstruction cyi)
                     {
                         // WWW, WaitForSecondsRealtime
-                        var e2 = UnwrapWaitCustomYieldInstruction((CustomYieldInstruction)current);
+                        while (cyi.keepWaiting)
-                        while (e2.MoveNext())
                         {
                             yield return null;
                         }
@@ -181,7 +232,7 @@ namespace Cysharp.Threading.Tasks
                         }
                         else
                         {
-                            yield return null;
+                            goto WARN;
                         }
                     }
                     else if (current is IEnumerator e3)
@@ -194,17 +245,14 @@ namespace Cysharp.Threading.Tasks
                     }
                     else
                     {
-                        // WaitForEndOfFrame, WaitForFixedUpdate, others.
+                        goto WARN;
-                        yield return null;
                     }
-                }
-            }
 
-            // WWW and others as CustomYieldInstruction.
+                    continue;
-            static IEnumerator UnwrapWaitCustomYieldInstruction(CustomYieldInstruction yieldInstruction)
+
-            {
+                    WARN:
-                while (yieldInstruction.keepWaiting)
+                    // WaitForEndOfFrame, WaitForFixedUpdate, others.
-                {
+                    UnityEngine.Debug.LogWarning($"yield {current.GetType().Name} is not supported on await IEnumerator or IEnumerator.ToUniTask(), please use ToUniTask(MonoBehaviour coroutineRunner) instead.");
                     yield return null;
                 }
             }
@@ -214,12 +262,12 @@ namespace Cysharp.Threading.Tasks
             static IEnumerator UnwrapWaitForSeconds(WaitForSeconds waitForSeconds)
             {
                 var second = (float)waitForSeconds_Seconds.GetValue(waitForSeconds);
-                var startTime = DateTimeOffset.UtcNow;
+                var elapsed = 0.0f;
                 while (true)
                 {
                     yield return null;
 
-                    var elapsed = (DateTimeOffset.UtcNow - startTime).TotalSeconds;
+                    elapsed += Time.deltaTime;
                     if (elapsed >= second)
                     {
                         break;
@@ -236,5 +284,4 @@ namespace Cysharp.Threading.Tasks
             }
         }
     }
-}
+}
-

src/UniTask/Assets/Plugins/UniTask/Runtime/External/Addressables.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: a5b9231662e24c942b544bd85d4b39cb
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

src/UniTask/Assets/Plugins/UniTask/Runtime/External/Addressables/AddressablesAsyncExtensions.cs

@@ -11,24 +11,39 @@ using UnityEngine.ResourceManagement.AsyncOperations;
 
 namespace Cysharp.Threading.Tasks
 {
-    public static class AddressableAsyncExtensions
+    public static class AddressablesAsyncExtensions
     {
-        #region AsyncOperationHandle
+#region AsyncOperationHandle
 
-        public static AsyncOperationHandleAwaiter GetAwaiter(this AsyncOperationHandle handle)
+        public static UniTask.Awaiter GetAwaiter(this AsyncOperationHandle handle)
         {
-            return new AsyncOperationHandleAwaiter(handle);
+            return ToUniTask(handle).GetAwaiter();
         }
 
         public static UniTask WithCancellation(this AsyncOperationHandle handle, CancellationToken cancellationToken)
         {
-            if (handle.IsDone) return UniTask.CompletedTask;
+            return ToUniTask(handle, cancellationToken: cancellationToken);
-            return new UniTask(AsyncOperationHandleConfiguredSource.Create(handle, PlayerLoopTiming.Update, null, cancellationToken, out var token), token);
         }
 
         public static UniTask ToUniTask(this AsyncOperationHandle handle, IProgress<float> progress = null, PlayerLoopTiming timing = PlayerLoopTiming.Update, CancellationToken cancellationToken = default(CancellationToken))
         {
-            if (handle.IsDone) return UniTask.CompletedTask;
+            if (cancellationToken.IsCancellationRequested) return UniTask.FromCanceled(cancellationToken);
+
+            if (!handle.IsValid())
+            {
+                // autoReleaseHandle:true handle is invalid(immediately internal handle == null) so return completed.
+                return UniTask.CompletedTask;
+            }
+
+            if (handle.IsDone)
+            {
+                if (handle.Status == AsyncOperationStatus.Failed)
+                {
+                    return UniTask.FromException(handle.OperationException);
+                }
+                return UniTask.CompletedTask;
+            }
+
             return new UniTask(AsyncOperationHandleConfiguredSource.Create(handle, timing, progress, cancellationToken, out var token), token);
         }
 
@@ -80,22 +95,25 @@ namespace Cysharp.Threading.Tasks
         sealed class AsyncOperationHandleConfiguredSource : IUniTaskSource, IPlayerLoopItem, ITaskPoolNode<AsyncOperationHandleConfiguredSource>
         {
             static TaskPool<AsyncOperationHandleConfiguredSource> pool;
-            public AsyncOperationHandleConfiguredSource NextNode { get; set; }
+            AsyncOperationHandleConfiguredSource nextNode;
+            public ref AsyncOperationHandleConfiguredSource NextNode => ref nextNode;
 
             static AsyncOperationHandleConfiguredSource()
             {
-                TaskPoolMonitor.RegisterSizeGetter(typeof(AsyncOperationHandleConfiguredSource), () => pool.Size);
+                TaskPool.RegisterSizeGetter(typeof(AsyncOperationHandleConfiguredSource), () => pool.Size);
             }
 
+            readonly Action<AsyncOperationHandle> continuationAction;
             AsyncOperationHandle handle;
-            IProgress<float> progress;
             CancellationToken cancellationToken;
+            IProgress<float> progress;
+            bool completed;
 
             UniTaskCompletionSourceCore<AsyncUnit> core;
 
             AsyncOperationHandleConfiguredSource()
             {
-
+                continuationAction = Continuation;
             }
 
             public static IUniTaskSource Create(AsyncOperationHandle handle, PlayerLoopTiming timing, IProgress<float> progress, CancellationToken cancellationToken, out short token)
@@ -113,26 +131,47 @@ namespace Cysharp.Threading.Tasks
                 result.handle = handle;
                 result.progress = progress;
                 result.cancellationToken = cancellationToken;
+                result.completed = false;
 
                 TaskTracker.TrackActiveTask(result, 3);
 
                 PlayerLoopHelper.AddAction(timing, result);
 
+                handle.Completed += result.continuationAction;
+
                 token = result.core.Version;
                 return result;
             }
 
-            public void GetResult(short token)
+            void Continuation(AsyncOperationHandle _)
             {
-                try
+                handle.Completed -= continuationAction;
-                {
 
-                    core.GetResult(token);
+                if (completed)
-                }
-                finally
                 {
                     TryReturn();
                 }
+                else
+                {
+                    completed = true;
+                    if (cancellationToken.IsCancellationRequested)
+                    {
+                        core.TrySetCanceled(cancellationToken);
+                    }
+                    else if (handle.Status == AsyncOperationStatus.Failed)
+                    {
+                        core.TrySetException(handle.OperationException);
+                    }
+                    else
+                    {
+                        core.TrySetResult(AsyncUnit.Default);
+                    }
+                }
+            }
+
+            public void GetResult(short token)
+            {
+                core.GetResult(token);
             }
 
             public UniTaskStatus GetStatus(short token)
@@ -152,138 +191,95 @@ namespace Cysharp.Threading.Tasks
 
             public bool MoveNext()
             {
+                if (completed)
+                {
+                    TryReturn();
+                    return false;
+                }
+
                 if (cancellationToken.IsCancellationRequested)
                 {
+                    completed = true;
                     core.TrySetCanceled(cancellationToken);
                     return false;
                 }
 
-                if (progress != null)
+                if (progress != null && handle.IsValid())
                 {
                     progress.Report(handle.PercentComplete);
                 }
 
-                if (handle.IsDone)
-                {
-                    if (handle.Status == AsyncOperationStatus.Failed)
-                    {
-                        core.TrySetException(handle.OperationException);
-                    }
-                    else
-                    {
-                        core.TrySetResult(AsyncUnit.Default);
-                    }
-                    return false;
-                }
-
                 return true;
             }
 
             bool TryReturn()
             {
-                core.Reset();
                 TaskTracker.RemoveTracking(this);
+                core.Reset();
                 handle = default;
                 progress = default;
                 cancellationToken = default;
                 return pool.TryPush(this);
             }
-
-            ~AsyncOperationHandleConfiguredSource()
-            {
-                if (TryReturn())
-                {
-                    GC.ReRegisterForFinalize(this);
-                }
-            }
         }
 
-        #endregion
+#endregion
 
-        #region AsyncOperationHandle_T
+#region AsyncOperationHandle_T
 
-        public static AsyncOperationHandleAwaiter<T> GetAwaiter<T>(this AsyncOperationHandle<T> handle)
+        public static UniTask<T>.Awaiter GetAwaiter<T>(this AsyncOperationHandle<T> handle)
         {
-            return new AsyncOperationHandleAwaiter<T>(handle);
+            return ToUniTask(handle).GetAwaiter();
         }
 
         public static UniTask<T> WithCancellation<T>(this AsyncOperationHandle<T> handle, CancellationToken cancellationToken)
         {
-            if (handle.IsDone) return UniTask.FromResult(handle.Result);
+            return ToUniTask(handle, cancellationToken: cancellationToken);
-            return new UniTask<T>(AsyncOperationHandleConfiguredSource<T>.Create(handle, PlayerLoopTiming.Update, null, cancellationToken, out var token), token);
         }
 
         public static UniTask<T> ToUniTask<T>(this AsyncOperationHandle<T> handle, IProgress<float> progress = null, PlayerLoopTiming timing = PlayerLoopTiming.Update, CancellationToken cancellationToken = default(CancellationToken))
         {
-            if (handle.IsDone) return UniTask.FromResult(handle.Result);
+            if (cancellationToken.IsCancellationRequested) return UniTask.FromCanceled<T>(cancellationToken);
-            return new UniTask<T>(AsyncOperationHandleConfiguredSource<T>.Create(handle, timing, progress, cancellationToken, out var token), token);
-        }
 
-        public struct AsyncOperationHandleAwaiter<T> : ICriticalNotifyCompletion
+            if (!handle.IsValid())
-        {
-            AsyncOperationHandle<T> handle;
-            Action<AsyncOperationHandle> continuationAction;
-
-            public AsyncOperationHandleAwaiter(AsyncOperationHandle<T> handle)
             {
-                this.handle = handle;
+                throw new Exception("Attempting to use an invalid operation handle");
-                this.continuationAction = null;
             }
 
-            public bool IsCompleted => handle.IsDone;
+            if (handle.IsDone)
-
-            public T GetResult()
             {
-                if (continuationAction != null)
-                {
-                    handle.CompletedTypeless -= continuationAction;
-                    continuationAction = null;
-                }
-
                 if (handle.Status == AsyncOperationStatus.Failed)
                 {
-                    var e = handle.OperationException;
+                    return UniTask.FromException<T>(handle.OperationException);
-                    handle = default;
-                    ExceptionDispatchInfo.Capture(e).Throw();
                 }
-
+                return UniTask.FromResult(handle.Result);
-                var result = handle.Result;
-                handle = default;
-                return result;
             }
 
-            public void OnCompleted(Action continuation)
+            return new UniTask<T>(AsyncOperationHandleConfiguredSource<T>.Create(handle, timing, progress, cancellationToken, out var token), token);
-            {
-                UnsafeOnCompleted(continuation);
-            }
-
-            public void UnsafeOnCompleted(Action continuation)
-            {
-                Error.ThrowWhenContinuationIsAlreadyRegistered(continuationAction);
-                continuationAction = PooledDelegate<AsyncOperationHandle>.Create(continuation);
-                handle.CompletedTypeless += continuationAction;
-            }
         }
 
         sealed class AsyncOperationHandleConfiguredSource<T> : IUniTaskSource<T>, IPlayerLoopItem, ITaskPoolNode<AsyncOperationHandleConfiguredSource<T>>
         {
             static TaskPool<AsyncOperationHandleConfiguredSource<T>> pool;
-            public AsyncOperationHandleConfiguredSource<T> NextNode { get; set; }
+            AsyncOperationHandleConfiguredSource<T> nextNode;
+            public ref AsyncOperationHandleConfiguredSource<T> NextNode => ref nextNode;
 
             static AsyncOperationHandleConfiguredSource()
             {
-                TaskPoolMonitor.RegisterSizeGetter(typeof(AsyncOperationHandleConfiguredSource<T>), () => pool.Size);
+                TaskPool.RegisterSizeGetter(typeof(AsyncOperationHandleConfiguredSource<T>), () => pool.Size);
             }
 
+            readonly Action<AsyncOperationHandle<T>> continuationAction;
             AsyncOperationHandle<T> handle;
-            IProgress<float> progress;
             CancellationToken cancellationToken;
+            IProgress<float> progress;
+            bool completed;
 
             UniTaskCompletionSourceCore<T> core;
 
             AsyncOperationHandleConfiguredSource()
             {
-
+                continuationAction = Continuation;
             }
 
             public static IUniTaskSource<T> Create(AsyncOperationHandle<T> handle, PlayerLoopTiming timing, IProgress<float> progress, CancellationToken cancellationToken, out short token)
@@ -299,27 +295,49 @@ namespace Cysharp.Threading.Tasks
                 }
 
                 result.handle = handle;
-                result.progress = progress;
                 result.cancellationToken = cancellationToken;
+                result.completed = false;
+                result.progress = progress;
 
                 TaskTracker.TrackActiveTask(result, 3);
 
                 PlayerLoopHelper.AddAction(timing, result);
 
+                handle.Completed += result.continuationAction;
+
                 token = result.core.Version;
                 return result;
             }
 
-            public T GetResult(short token)
+            void Continuation(AsyncOperationHandle<T> argHandle)
             {
-                try
+                handle.Completed -= continuationAction;
-                {
+
-                    return core.GetResult(token);
+                if (completed)
-                }
-                finally
                 {
                     TryReturn();
                 }
+                else
+                {
+                    completed = true;
+                    if (cancellationToken.IsCancellationRequested)
+                    {
+                        core.TrySetCanceled(cancellationToken);
+                    }
+                    else if (argHandle.Status == AsyncOperationStatus.Failed)
+                    {
+                        core.TrySetException(argHandle.OperationException);
+                    }
+                    else
+                    {
+                        core.TrySetResult(argHandle.Result);
+                    }
+                }
+            }
+
+            public T GetResult(short token)
+            {
+                return core.GetResult(token);
             }
 
             void IUniTaskSource.GetResult(short token)
@@ -344,30 +362,24 @@ namespace Cysharp.Threading.Tasks
 
             public bool MoveNext()
             {
+                if (completed)
+                {
+                    TryReturn();
+                    return false;
+                }
+
                 if (cancellationToken.IsCancellationRequested)
                 {
+                    completed = true;
                     core.TrySetCanceled(cancellationToken);
                     return false;
                 }
 
-                if (progress != null)
+                if (progress != null && handle.IsValid())
                 {
                     progress.Report(handle.PercentComplete);
                 }
 
-                if (handle.IsDone)
-                {
-                    if (handle.Status == AsyncOperationStatus.Failed)
-                    {
-                        core.TrySetException(handle.OperationException);
-                    }
-                    else
-                    {
-                        core.TrySetResult(handle.Result);
-                    }
-                    return false;
-                }
-
                 return true;
             }
 
@@ -380,17 +392,9 @@ namespace Cysharp.Threading.Tasks
                 cancellationToken = default;
                 return pool.TryPush(this);
             }
-
-            ~AsyncOperationHandleConfiguredSource()
-            {
-                if (TryReturn())
-                {
-                    GC.ReRegisterForFinalize(this);
-                }
-            }
         }
 
-        #endregion
+#endregion
     }
 }
 

src/UniTask/Assets/Plugins/UniTask/Runtime/External/Addressables/UniTask.Addressables.asmdef

@@ -0,0 +1,22 @@
+{
+    "name": "UniTask.Addressables",
+    "references": [
+        "UniTask",
+        "Unity.ResourceManager"
+    ],
+    "includePlatforms": [],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": false,
+    "precompiledReferences": [],
+    "autoReferenced": true,
+    "defineConstraints": [],
+    "versionDefines": [
+        {
+            "name": "com.unity.addressables",
+            "expression": "",
+            "define": "UNITASK_ADDRESSABLE_SUPPORT"
+        }
+    ],
+    "noEngineReferences": false
+}

src/UniTask/Assets/Plugins/UniTask/Runtime/External/Addressables/UniTask.Addressables.asmdef.meta

@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: 593a5b492d29ac6448b1ebf7f035ef33
+AssemblyDefinitionImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

src/UniTask/Assets/Plugins/UniTask/Runtime/External/DOTween.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 25cb2f742bfeb1d48a4e65d3140b955d
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

src/UniTask/Assets/Plugins/UniTask/Runtime/External/DOTween/DOTweenAsyncExtensions.cs

@@ -0,0 +1,458 @@
+// asmdef Version Defines, enabled when com.demigiant.dotween is imported.
+
+#if UNITASK_DOTWEEN_SUPPORT
+
+using Cysharp.Threading.Tasks.Internal;
+using DG.Tweening;
+using System;
+using System.Collections.Concurrent;
+using System.Runtime.CompilerServices;
+using System.Threading;
+
+namespace Cysharp.Threading.Tasks
+{
+    public enum TweenCancelBehaviour
+    {
+        Kill,
+        KillWithCompleteCallback,
+        Complete,
+        CompleteWithSeqeunceCallback,
+        CancelAwait,
+
+        // AndCancelAwait
+        KillAndCancelAwait,
+        KillWithCompleteCallbackAndCancelAwait,
+        CompleteAndCancelAwait,
+        CompleteWithSeqeunceCallbackAndCancelAwait
+    }
+
+    public static class DOTweenAsyncExtensions
+    {
+        enum CallbackType
+        {
+            Kill,
+            Complete,
+            Pause,
+            Play,
+            Rewind,
+            StepComplete
+        }
+
+        public static TweenAwaiter GetAwaiter(this Tween tween)
+        {
+            return new TweenAwaiter(tween);
+        }
+
+        public static UniTask WithCancellation(this Tween tween, CancellationToken cancellationToken)
+        {
+            Error.ThrowArgumentNullException(tween, nameof(tween));
+
+            if (!tween.IsActive()) return UniTask.CompletedTask;
+            return new UniTask(TweenConfiguredSource.Create(tween, TweenCancelBehaviour.Kill, cancellationToken, CallbackType.Kill, out var token), token);
+        }
+
+        public static UniTask ToUniTask(this Tween tween, TweenCancelBehaviour tweenCancelBehaviour = TweenCancelBehaviour.Kill, CancellationToken cancellationToken = default)
+        {
+            Error.ThrowArgumentNullException(tween, nameof(tween));
+
+            if (!tween.IsActive()) return UniTask.CompletedTask;
+            return new UniTask(TweenConfiguredSource.Create(tween, tweenCancelBehaviour, cancellationToken, CallbackType.Kill, out var token), token);
+        }
+
+        public static UniTask AwaitForComplete(this Tween tween, TweenCancelBehaviour tweenCancelBehaviour = TweenCancelBehaviour.Kill, CancellationToken cancellationToken = default)
+        {
+            Error.ThrowArgumentNullException(tween, nameof(tween));
+
+            if (!tween.IsActive()) return UniTask.CompletedTask;
+            return new UniTask(TweenConfiguredSource.Create(tween, tweenCancelBehaviour, cancellationToken, CallbackType.Complete, out var token), token);
+        }
+
+        public static UniTask AwaitForPause(this Tween tween, TweenCancelBehaviour tweenCancelBehaviour = TweenCancelBehaviour.Kill, CancellationToken cancellationToken = default)
+        {
+            Error.ThrowArgumentNullException(tween, nameof(tween));
+
+            if (!tween.IsActive()) return UniTask.CompletedTask;
+            return new UniTask(TweenConfiguredSource.Create(tween, tweenCancelBehaviour, cancellationToken, CallbackType.Pause, out var token), token);
+        }
+
+        public static UniTask AwaitForPlay(this Tween tween, TweenCancelBehaviour tweenCancelBehaviour = TweenCancelBehaviour.Kill, CancellationToken cancellationToken = default)
+        {
+            Error.ThrowArgumentNullException(tween, nameof(tween));
+
+            if (!tween.IsActive()) return UniTask.CompletedTask;
+            return new UniTask(TweenConfiguredSource.Create(tween, tweenCancelBehaviour, cancellationToken, CallbackType.Play, out var token), token);
+        }
+
+        public static UniTask AwaitForRewind(this Tween tween, TweenCancelBehaviour tweenCancelBehaviour = TweenCancelBehaviour.Kill, CancellationToken cancellationToken = default)
+        {
+            Error.ThrowArgumentNullException(tween, nameof(tween));
+
+            if (!tween.IsActive()) return UniTask.CompletedTask;
+            return new UniTask(TweenConfiguredSource.Create(tween, tweenCancelBehaviour, cancellationToken, CallbackType.Rewind, out var token), token);
+        }
+
+        public static UniTask AwaitForStepComplete(this Tween tween, TweenCancelBehaviour tweenCancelBehaviour = TweenCancelBehaviour.Kill, CancellationToken cancellationToken = default)
+        {
+            Error.ThrowArgumentNullException(tween, nameof(tween));
+
+            if (!tween.IsActive()) return UniTask.CompletedTask;
+            return new UniTask(TweenConfiguredSource.Create(tween, tweenCancelBehaviour, cancellationToken, CallbackType.StepComplete, out var token), token);
+        }
+
+        public struct TweenAwaiter : ICriticalNotifyCompletion
+        {
+            readonly Tween tween;
+
+            // killed(non active) as completed.
+            public bool IsCompleted => !tween.IsActive();
+
+            public TweenAwaiter(Tween tween)
+            {
+                this.tween = tween;
+            }
+
+            public TweenAwaiter GetAwaiter()
+            {
+                return this;
+            }
+
+            public void GetResult()
+            {
+            }
+
+            public void OnCompleted(System.Action continuation)
+            {
+                UnsafeOnCompleted(continuation);
+            }
+
+            public void UnsafeOnCompleted(System.Action continuation)
+            {
+                // onKill is called after OnCompleted, both Complete(false/true) and Kill(false/true).
+                tween.onKill = PooledTweenCallback.Create(continuation);
+            }
+        }
+
+        sealed class TweenConfiguredSource : IUniTaskSource, ITaskPoolNode<TweenConfiguredSource>
+        {
+            static TaskPool<TweenConfiguredSource> pool;
+            TweenConfiguredSource nextNode;
+            public ref TweenConfiguredSource NextNode => ref nextNode;
+
+            static TweenConfiguredSource()
+            {
+                TaskPool.RegisterSizeGetter(typeof(TweenConfiguredSource), () => pool.Size);
+            }
+
+            static readonly TweenCallback EmptyTweenCallback = () => { };
+
+            readonly TweenCallback onCompleteCallbackDelegate;
+            readonly TweenCallback onUpdateDelegate;
+
+            Tween tween;
+            TweenCancelBehaviour cancelBehaviour;
+            CancellationToken cancellationToken;
+            CallbackType callbackType;
+            bool canceled;
+
+            TweenCallback originalUpdateAction;
+            UniTaskCompletionSourceCore<AsyncUnit> core;
+
+            TweenConfiguredSource()
+            {
+                onCompleteCallbackDelegate = OnCompleteCallbackDelegate;
+                onUpdateDelegate = OnUpdate;
+            }
+
+            public static IUniTaskSource Create(Tween tween, TweenCancelBehaviour cancelBehaviour, CancellationToken cancellationToken, CallbackType callbackType, out short token)
+            {
+                if (cancellationToken.IsCancellationRequested)
+                {
+                    DoCancelBeforeCreate(tween, cancelBehaviour);
+                    return AutoResetUniTaskCompletionSource.CreateFromCanceled(cancellationToken, out token);
+                }
+
+                if (!pool.TryPop(out var result))
+                {
+                    result = new TweenConfiguredSource();
+                }
+
+                result.tween = tween;
+                result.cancelBehaviour = cancelBehaviour;
+                result.cancellationToken = cancellationToken;
+                result.callbackType = callbackType;
+
+                result.originalUpdateAction = tween.onUpdate;
+                result.canceled = false;
+
+                if (result.originalUpdateAction == result.onUpdateDelegate)
+                {
+                    result.originalUpdateAction = null;
+                }
+
+                tween.onUpdate = result.onUpdateDelegate;
+
+                switch (callbackType)
+                {
+                    case CallbackType.Kill:
+                        tween.onKill = result.onCompleteCallbackDelegate;
+                        break;
+                    case CallbackType.Complete:
+                        tween.onComplete = result.onCompleteCallbackDelegate;
+                        break;
+                    case CallbackType.Pause:
+                        tween.onPause = result.onCompleteCallbackDelegate;
+                        break;
+                    case CallbackType.Play:
+                        tween.onPlay = result.onCompleteCallbackDelegate;
+                        break;
+                    case CallbackType.Rewind:
+                        tween.onRewind = result.onCompleteCallbackDelegate;
+                        break;
+                    case CallbackType.StepComplete:
+                        tween.onStepComplete = result.onCompleteCallbackDelegate;
+                        break;
+                    default:
+                        break;
+                }
+
+                TaskTracker.TrackActiveTask(result, 3);
+
+                token = result.core.Version;
+                return result;
+            }
+
+            void OnCompleteCallbackDelegate()
+            {
+                if (cancellationToken.IsCancellationRequested)
+                {
+                    if (this.cancelBehaviour == TweenCancelBehaviour.KillAndCancelAwait
+                        || this.cancelBehaviour == TweenCancelBehaviour.KillWithCompleteCallbackAndCancelAwait
+                        || this.cancelBehaviour == TweenCancelBehaviour.CompleteAndCancelAwait
+                        || this.cancelBehaviour == TweenCancelBehaviour.CompleteWithSeqeunceCallbackAndCancelAwait
+                        || this.cancelBehaviour == TweenCancelBehaviour.CancelAwait)
+                    {
+                        canceled = true;
+                    }
+                }
+                if (canceled)
+                {
+                    core.TrySetCanceled(cancellationToken);
+                }
+                else
+                {
+                    core.TrySetResult(AsyncUnit.Default);
+                }
+            }
+
+            void OnUpdate()
+            {
+                originalUpdateAction?.Invoke();
+
+                if (!cancellationToken.IsCancellationRequested)
+                {
+                    return;
+                }
+
+                switch (this.cancelBehaviour)
+                {
+                    case TweenCancelBehaviour.Kill:
+                    default:
+                        this.tween.Kill(false);
+                        break;
+                    case TweenCancelBehaviour.KillAndCancelAwait:
+                        this.canceled = true;
+                        this.tween.Kill(false);
+                        break;
+                    case TweenCancelBehaviour.KillWithCompleteCallback:
+                        this.tween.Kill(true);
+                        break;
+                    case TweenCancelBehaviour.KillWithCompleteCallbackAndCancelAwait:
+                        this.canceled = true;
+                        this.tween.Kill(true);
+                        break;
+                    case TweenCancelBehaviour.Complete:
+                        this.tween.Complete(false);
+                        break;
+                    case TweenCancelBehaviour.CompleteAndCancelAwait:
+                        this.canceled = true;
+                        this.tween.Complete(false);
+                        break;
+                    case TweenCancelBehaviour.CompleteWithSeqeunceCallback:
+                        this.tween.Complete(true);
+                        break;
+                    case TweenCancelBehaviour.CompleteWithSeqeunceCallbackAndCancelAwait:
+                        this.canceled = true;
+                        this.tween.Complete(true);
+                        break;
+                    case TweenCancelBehaviour.CancelAwait:
+                        // replace to empty(avoid callback after Canceled(instance is returned to pool.)
+                        switch (callbackType)
+                        {
+                            case CallbackType.Kill:
+                                tween.onKill = EmptyTweenCallback;
+                                break;
+                            case CallbackType.Complete:
+                                tween.onComplete = EmptyTweenCallback;
+                                break;
+                            case CallbackType.Pause:
+                                tween.onPause = EmptyTweenCallback;
+                                break;
+                            case CallbackType.Play:
+                                tween.onPlay = EmptyTweenCallback;
+                                break;
+                            case CallbackType.Rewind:
+                                tween.onRewind = EmptyTweenCallback;
+                                break;
+                            case CallbackType.StepComplete:
+                                tween.onStepComplete = EmptyTweenCallback;
+                                break;
+                            default:
+                                break;
+                        }
+
+                        this.core.TrySetCanceled(this.cancellationToken);
+                        break;
+                }
+            }
+
+            static void DoCancelBeforeCreate(Tween tween, TweenCancelBehaviour tweenCancelBehaviour)
+            {
+
+                switch (tweenCancelBehaviour)
+                {
+                    case TweenCancelBehaviour.Kill:
+                    default:
+                        tween.Kill(false);
+                        break;
+                    case TweenCancelBehaviour.KillAndCancelAwait:
+                        tween.Kill(false);
+                        break;
+                    case TweenCancelBehaviour.KillWithCompleteCallback:
+                        tween.Kill(true);
+                        break;
+                    case TweenCancelBehaviour.KillWithCompleteCallbackAndCancelAwait:
+                        tween.Kill(true);
+                        break;
+                    case TweenCancelBehaviour.Complete:
+                        tween.Complete(false);
+                        break;
+                    case TweenCancelBehaviour.CompleteAndCancelAwait:
+                        tween.Complete(false);
+                        break;
+                    case TweenCancelBehaviour.CompleteWithSeqeunceCallback:
+                        tween.Complete(true);
+                        break;
+                    case TweenCancelBehaviour.CompleteWithSeqeunceCallbackAndCancelAwait:
+                        tween.Complete(true);
+                        break;
+                    case TweenCancelBehaviour.CancelAwait:
+                        break;
+                }
+            }
+
+            public void GetResult(short token)
+            {
+                try
+                {
+                    core.GetResult(token);
+                }
+                finally
+                {
+                    TryReturn();
+                }
+            }
+
+            public UniTaskStatus GetStatus(short token)
+            {
+                return core.GetStatus(token);
+            }
+
+            public UniTaskStatus UnsafeGetStatus()
+            {
+                return core.UnsafeGetStatus();
+            }
+
+            public void OnCompleted(Action<object> continuation, object state, short token)
+            {
+                core.OnCompleted(continuation, state, token);
+            }
+
+            bool TryReturn()
+            {
+                TaskTracker.RemoveTracking(this);
+                core.Reset();
+                tween.onUpdate = originalUpdateAction;
+
+                switch (callbackType)
+                {
+                    case CallbackType.Kill:
+                        tween.onKill = null;
+                        break;
+                    case CallbackType.Complete:
+                        tween.onComplete = null;
+                        break;
+                    case CallbackType.Pause:
+                        tween.onPause = null;
+                        break;
+                    case CallbackType.Play:
+                        tween.onPlay = null;
+                        break;
+                    case CallbackType.Rewind:
+                        tween.onRewind = null;
+                        break;
+                    case CallbackType.StepComplete:
+                        tween.onStepComplete = null;
+                        break;
+                    default:
+                        break;
+                }
+
+                tween = default;
+                cancellationToken = default;
+                originalUpdateAction = default;
+                return pool.TryPush(this);
+            }
+        }
+    }
+
+    sealed class PooledTweenCallback
+    {
+        static readonly ConcurrentQueue<PooledTweenCallback> pool = new ConcurrentQueue<PooledTweenCallback>();
+
+        readonly TweenCallback runDelegate;
+
+        Action continuation;
+
+
+        PooledTweenCallback()
+        {
+            runDelegate = Run;
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static TweenCallback Create(Action continuation)
+        {
+            if (!pool.TryDequeue(out var item))
+            {
+                item = new PooledTweenCallback();
+            }
+
+            item.continuation = continuation;
+            return item.runDelegate;
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        void Run()
+        {
+            var call = continuation;
+            continuation = null;
+            if (call != null)
+            {
+                pool.Enqueue(this);
+                call.Invoke();
+            }
+        }
+    }
+}
+
+#endif

src/UniTask/Assets/Plugins/UniTask/Runtime/External/DOTween/UniTask.DOTween.asmdef

@@ -0,0 +1,22 @@
+{
+    "name": "UniTask.DOTween",
+    "references": [
+        "UniTask",
+        "DOTween.Modules"
+    ],
+    "includePlatforms": [],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": false,
+    "precompiledReferences": [],
+    "autoReferenced": true,
+    "defineConstraints": [],
+    "versionDefines": [
+        {
+            "name": "com.demigiant.dotween",
+            "expression": "",
+            "define": "UNITASK_DOTWEEN_SUPPORT"
+        }
+    ],
+    "noEngineReferences": false
+}

src/UniTask/Assets/Plugins/UniTask/Runtime/External/DOTween/UniTask.DOTween.asmdef.meta

@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: 029c1c1b674aaae47a6841a0b89ad80e
+AssemblyDefinitionImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

src/UniTask/Assets/Plugins/UniTask/Runtime/External/DoTweenAsyncExtensions.cs

@@ -1,290 +0,0 @@
-// asmdef Version Defines, enabled when com.demigiant.dotween is imported.
-
-#if UNITASK_DOTWEEN_SUPPORT
-
-using Cysharp.Threading.Tasks.Internal;
-using DG.Tweening;
-using System;
-using System.Collections.Concurrent;
-using System.Runtime.CompilerServices;
-using System.Threading;
-
-namespace Cysharp.Threading.Tasks
-{
-    // The idea of TweenCancelBehaviour is borrowed from https://www.shibuya24.info/entry/dotween_async_await
-    public enum TweenCancelBehaviour
-    {
-        Kill,
-        KillWithCompleteCallback,
-        Complete,
-        CompleteWithSeqeunceCallback,
-        CancelAwait,
-
-        // AndCancelAwait
-        KillAndCancelAwait,
-        KillWithCompleteCallbackAndCancelAwait,
-        CompleteAndCancelAwait,
-        CompleteWithSeqeunceCallbackAndCancelAwait
-    }
-
-    public static class DOTweenAsyncExtensions
-    {
-        public static TweenAwaiter GetAwaiter(this Tween tween)
-        {
-            return new TweenAwaiter(tween);
-        }
-
-        public static UniTask WithCancellation(this Tween tween, CancellationToken cancellationToken)
-        {
-            Error.ThrowArgumentNullException(tween, nameof(tween));
-
-            if (!tween.IsActive()) return UniTask.CompletedTask;
-            return new UniTask(TweenConfiguredSource.Create(tween, TweenCancelBehaviour.Kill, cancellationToken, out var token), token);
-        }
-
-        public static UniTask ToUniTask(this Tween tween, TweenCancelBehaviour tweenCancelBehaviour = TweenCancelBehaviour.Kill, CancellationToken cancellationToken = default)
-        {
-            Error.ThrowArgumentNullException(tween, nameof(tween));
-
-            if (!tween.IsActive()) return UniTask.CompletedTask;
-            return new UniTask(TweenConfiguredSource.Create(tween, tweenCancelBehaviour, cancellationToken, out var token), token);
-        }
-
-        public struct TweenAwaiter : ICriticalNotifyCompletion
-        {
-            readonly Tween tween;
-
-            // killed(non active) as completed.
-            public bool IsCompleted => !tween.IsActive();
-
-            public TweenAwaiter(Tween tween)
-            {
-                this.tween = tween;
-            }
-
-            public TweenAwaiter GetAwaiter()
-            {
-                return this;
-            }
-
-            public void GetResult()
-            {
-            }
-
-            public void OnCompleted(System.Action continuation)
-            {
-                UnsafeOnCompleted(continuation);
-            }
-
-            public void UnsafeOnCompleted(System.Action continuation)
-            {
-                // onKill is called after OnCompleted, both Complete(false/true) and Kill(false/true).
-                tween.onKill = PooledTweenCallback.Create(continuation);
-            }
-        }
-
-        sealed class TweenConfiguredSource : IUniTaskSource, ITaskPoolNode<TweenConfiguredSource>
-        {
-            static TaskPool<TweenConfiguredSource> pool;
-            public TweenConfiguredSource NextNode { get; set; }
-
-            static TweenConfiguredSource()
-            {
-                TaskPoolMonitor.RegisterSizeGetter(typeof(TweenConfiguredSource), () => pool.Size);
-            }
-
-            static readonly Action<object> CancellationCallbackDelegate = CancellationCallback;
-            static readonly TweenCallback EmptyTweenCallback = () => { };
-
-            readonly TweenCallback onKillDelegate;
-
-            Tween tween;
-            TweenCancelBehaviour cancelBehaviour;
-            CancellationToken cancellationToken;
-            bool canceled;
-
-            CancellationTokenRegistration cancellationTokenRegistration;
-            UniTaskCompletionSourceCore<AsyncUnit> core;
-
-            TweenConfiguredSource()
-            {
-                onKillDelegate = OnKill;
-            }
-
-            public static IUniTaskSource Create(Tween tween, TweenCancelBehaviour cancelBehaviour, CancellationToken cancellationToken, out short token)
-            {
-                if (cancellationToken.IsCancellationRequested)
-                {
-                    return AutoResetUniTaskCompletionSource.CreateFromCanceled(cancellationToken, out token);
-                }
-
-                if (!pool.TryPop(out var result))
-                {
-                    result = new TweenConfiguredSource();
-                }
-
-                result.tween = tween;
-                result.cancelBehaviour = cancelBehaviour;
-                result.cancellationToken = cancellationToken;
-
-                TaskTracker.TrackActiveTask(result, 3);
-
-                result.RegisterEvent();
-
-                token = result.core.Version;
-                return result;
-            }
-
-            void RegisterEvent()
-            {
-                if (cancellationToken.CanBeCanceled)
-                {
-                    cancellationTokenRegistration = cancellationToken.RegisterWithoutCaptureExecutionContext(CancellationCallbackDelegate, this);
-                }
-
-                tween.OnKill(onKillDelegate);
-            }
-
-            void OnKill()
-            {
-                cancellationTokenRegistration.Dispose();
-                if (canceled)
-                {
-                    core.TrySetCanceled(cancellationToken);
-                }
-                else
-                {
-                    core.TrySetResult(AsyncUnit.Default);
-                }
-            }
-
-            static void CancellationCallback(object state)
-            {
-                var self = (TweenConfiguredSource)state;
-
-                switch (self.cancelBehaviour)
-                {
-                    case TweenCancelBehaviour.Kill:
-                    default:
-                        self.tween.Kill(false);
-                        break;
-                    case TweenCancelBehaviour.KillAndCancelAwait:
-                        self.canceled = true;
-                        self.tween.Kill(false);
-                        break;
-                    case TweenCancelBehaviour.KillWithCompleteCallback:
-                        self.tween.Kill(true);
-                        break;
-                    case TweenCancelBehaviour.KillWithCompleteCallbackAndCancelAwait:
-                        self.canceled = true;
-                        self.tween.Kill(true);
-                        break;
-                    case TweenCancelBehaviour.Complete:
-                        self.tween.Complete(false);
-                        break;
-                    case TweenCancelBehaviour.CompleteAndCancelAwait:
-                        self.canceled = true;
-                        self.tween.Complete(false);
-                        break;
-                    case TweenCancelBehaviour.CompleteWithSeqeunceCallback:
-                        self.tween.Complete(true);
-                        break;
-                    case TweenCancelBehaviour.CompleteWithSeqeunceCallbackAndCancelAwait:
-                        self.canceled = true;
-                        self.tween.Complete(true);
-                        break;
-                    case TweenCancelBehaviour.CancelAwait:
-                        self.tween.onKill = EmptyTweenCallback; // replace to empty(avoid callback after Caceled(instance is returned to pool.)
-                        self.core.TrySetCanceled(self.cancellationToken);
-                        break;
-                }
-            }
-
-            public void GetResult(short token)
-            {
-                try
-                {
-                    core.GetResult(token);
-                }
-                finally
-                {
-                    TryReturn();
-                }
-            }
-
-
-            public UniTaskStatus GetStatus(short token)
-            {
-                return core.GetStatus(token);
-            }
-
-            public UniTaskStatus UnsafeGetStatus()
-            {
-                return core.UnsafeGetStatus();
-            }
-
-            public void OnCompleted(Action<object> continuation, object state, short token)
-            {
-                core.OnCompleted(continuation, state, token);
-            }
-
-            bool TryReturn()
-            {
-                TaskTracker.RemoveTracking(this);
-                core.Reset();
-                tween = default;
-                cancellationToken = default;
-                return pool.TryPush(this);
-            }
-
-            ~TweenConfiguredSource()
-            {
-                if (TryReturn())
-                {
-                    GC.ReRegisterForFinalize(this);
-                }
-            }
-        }
-    }
-
-    sealed class PooledTweenCallback
-    {
-        static readonly ConcurrentQueue<PooledTweenCallback> pool = new ConcurrentQueue<PooledTweenCallback>();
-
-        readonly TweenCallback runDelegate;
-
-        Action continuation;
-
-
-        PooledTweenCallback()
-        {
-            runDelegate = Run;
-        }
-
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static TweenCallback Create(Action continuation)
-        {
-            if (!pool.TryDequeue(out var item))
-            {
-                item = new PooledTweenCallback();
-            }
-
-            item.continuation = continuation;
-            return item.runDelegate;
-        }
-
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        void Run()
-        {
-            var call = continuation;
-            continuation = null;
-            if (call != null)
-            {
-                pool.Enqueue(this);
-                call.Invoke();
-            }
-        }
-    }
-}
-
-#endif

src/UniTask/Assets/Plugins/UniTask/Runtime/External/TextMeshPro.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: f89da606bde9a4e4e94ae1189a029887
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

src/UniTask/Assets/Plugins/UniTask/Runtime/External/TextMeshPro/TextMeshProAsyncExtensions.InputField.cs

@@ -0,0 +1,224 @@
+#if UNITASK_TEXTMESHPRO_SUPPORT
+
+using System;
+using System.Threading;
+using TMPro;
+
+namespace Cysharp.Threading.Tasks
+{
+    public static partial class TextMeshProAsyncExtensions
+    {
+        public static IAsyncValueChangedEventHandler<string> GetAsyncValueChangedEventHandler(this TMP_InputField inputField)
+        {
+            return new AsyncUnityEventHandler<string>(inputField.onValueChanged, inputField.GetCancellationTokenOnDestroy(), false);
+        }
+
+        public static IAsyncValueChangedEventHandler<string> GetAsyncValueChangedEventHandler(this TMP_InputField inputField, CancellationToken cancellationToken)
+        {
+            return new AsyncUnityEventHandler<string>(inputField.onValueChanged, cancellationToken, false);
+        }
+
+        public static UniTask<string> OnValueChangedAsync(this TMP_InputField inputField)
+        {
+            return new AsyncUnityEventHandler<string>(inputField.onValueChanged, inputField.GetCancellationTokenOnDestroy(), true).OnInvokeAsync();
+        }
+
+        public static UniTask<string> OnValueChangedAsync(this TMP_InputField inputField, CancellationToken cancellationToken)
+        {
+            return new AsyncUnityEventHandler<string>(inputField.onValueChanged, cancellationToken, true).OnInvokeAsync();
+        }
+
+        public static IUniTaskAsyncEnumerable<string> OnValueChangedAsAsyncEnumerable(this TMP_InputField inputField)
+        {
+            return new UnityEventHandlerAsyncEnumerable<string>(inputField.onValueChanged, inputField.GetCancellationTokenOnDestroy());
+        }
+
+        public static IUniTaskAsyncEnumerable<string> OnValueChangedAsAsyncEnumerable(this TMP_InputField inputField, CancellationToken cancellationToken)
+        {
+            return new UnityEventHandlerAsyncEnumerable<string>(inputField.onValueChanged, cancellationToken);
+        }
+
+        public static IAsyncEndEditEventHandler<string> GetAsyncEndEditEventHandler(this TMP_InputField inputField)
+        {
+            return new AsyncUnityEventHandler<string>(inputField.onEndEdit, inputField.GetCancellationTokenOnDestroy(), false);
+        }
+
+        public static IAsyncEndEditEventHandler<string> GetAsyncEndEditEventHandler(this TMP_InputField inputField, CancellationToken cancellationToken)
+        {
+            return new AsyncUnityEventHandler<string>(inputField.onEndEdit, cancellationToken, false);
+        }
+
+        public static UniTask<string> OnEndEditAsync(this TMP_InputField inputField)
+        {
+            return new AsyncUnityEventHandler<string>(inputField.onEndEdit, inputField.GetCancellationTokenOnDestroy(), true).OnInvokeAsync();
+        }
+
+        public static UniTask<string> OnEndEditAsync(this TMP_InputField inputField, CancellationToken cancellationToken)
+        {
+            return new AsyncUnityEventHandler<string>(inputField.onEndEdit, cancellationToken, true).OnInvokeAsync();
+        }
+
+        public static IUniTaskAsyncEnumerable<string> OnEndEditAsAsyncEnumerable(this TMP_InputField inputField)
+        {
+            return new UnityEventHandlerAsyncEnumerable<string>(inputField.onEndEdit, inputField.GetCancellationTokenOnDestroy());
+        }
+
+        public static IUniTaskAsyncEnumerable<string> OnEndEditAsAsyncEnumerable(this TMP_InputField inputField, CancellationToken cancellationToken)
+        {
+            return new UnityEventHandlerAsyncEnumerable<string>(inputField.onEndEdit, cancellationToken);
+        }
+
+        public static IAsyncEndTextSelectionEventHandler<(string, int, int)> GetAsyncEndTextSelectionEventHandler(this TMP_InputField inputField)
+        {
+            return new AsyncUnityEventHandler<(string, int, int)>(new TextSelectionEventConverter(inputField.onEndTextSelection), inputField.GetCancellationTokenOnDestroy(), false);
+        }
+
+        public static IAsyncEndTextSelectionEventHandler<(string, int, int)> GetAsyncEndTextSelectionEventHandler(this TMP_InputField inputField, CancellationToken cancellationToken)
+        {
+            return new AsyncUnityEventHandler<(string, int, int)>(new TextSelectionEventConverter(inputField.onEndTextSelection), cancellationToken, false);
+        }
+
+        public static UniTask<(string, int, int)> OnEndTextSelectionAsync(this TMP_InputField inputField)
+        {
+            return new AsyncUnityEventHandler<(string, int, int)>(new TextSelectionEventConverter(inputField.onEndTextSelection), inputField.GetCancellationTokenOnDestroy(), true).OnInvokeAsync();
+        }
+
+        public static UniTask<(string, int, int)> OnEndTextSelectionAsync(this TMP_InputField inputField, CancellationToken cancellationToken)
+        {
+            return new AsyncUnityEventHandler<(string, int, int)>(new TextSelectionEventConverter(inputField.onEndTextSelection), cancellationToken, true).OnInvokeAsync();
+        }
+
+        public static IUniTaskAsyncEnumerable<(string, int, int)> OnEndTextSelectionAsAsyncEnumerable(this TMP_InputField inputField)
+        {
+            return new UnityEventHandlerAsyncEnumerable<(string, int, int)>(new TextSelectionEventConverter(inputField.onEndTextSelection), inputField.GetCancellationTokenOnDestroy());
+        }
+
+        public static IUniTaskAsyncEnumerable<(string, int, int)> OnEndTextSelectionAsAsyncEnumerable(this TMP_InputField inputField, CancellationToken cancellationToken)
+        {
+            return new UnityEventHandlerAsyncEnumerable<(string, int, int)>(new TextSelectionEventConverter(inputField.onEndTextSelection), cancellationToken);
+        }
+
+        public static IAsyncTextSelectionEventHandler<(string, int, int)> GetAsyncTextSelectionEventHandler(this TMP_InputField inputField)
+        {
+            return new AsyncUnityEventHandler<(string, int, int)>(new TextSelectionEventConverter(inputField.onTextSelection), inputField.GetCancellationTokenOnDestroy(), false);
+        }
+
+        public static IAsyncTextSelectionEventHandler<(string, int, int)> GetAsyncTextSelectionEventHandler(this TMP_InputField inputField, CancellationToken cancellationToken)
+        {
+            return new AsyncUnityEventHandler<(string, int, int)>(new TextSelectionEventConverter(inputField.onTextSelection), cancellationToken, false);
+        }
+
+        public static UniTask<(string, int, int)> OnTextSelectionAsync(this TMP_InputField inputField)
+        {
+            return new AsyncUnityEventHandler<(string, int, int)>(new TextSelectionEventConverter(inputField.onTextSelection), inputField.GetCancellationTokenOnDestroy(), true).OnInvokeAsync();
+        }
+
+        public static UniTask<(string, int, int)> OnTextSelectionAsync(this TMP_InputField inputField, CancellationToken cancellationToken)
+        {
+            return new AsyncUnityEventHandler<(string, int, int)>(new TextSelectionEventConverter(inputField.onTextSelection), cancellationToken, true).OnInvokeAsync();
+        }
+
+        public static IUniTaskAsyncEnumerable<(string, int, int)> OnTextSelectionAsAsyncEnumerable(this TMP_InputField inputField)
+        {
+            return new UnityEventHandlerAsyncEnumerable<(string, int, int)>(new TextSelectionEventConverter(inputField.onTextSelection), inputField.GetCancellationTokenOnDestroy());
+        }
+
+        public static IUniTaskAsyncEnumerable<(string, int, int)> OnTextSelectionAsAsyncEnumerable(this TMP_InputField inputField, CancellationToken cancellationToken)
+        {
+            return new UnityEventHandlerAsyncEnumerable<(string, int, int)>(new TextSelectionEventConverter(inputField.onTextSelection), cancellationToken);
+        }
+
+        public static IAsyncDeselectEventHandler<string> GetAsyncDeselectEventHandler(this TMP_InputField inputField)
+        {
+            return new AsyncUnityEventHandler<string>(inputField.onDeselect, inputField.GetCancellationTokenOnDestroy(), false);
+        }
+
+        public static IAsyncDeselectEventHandler<string> GetAsyncDeselectEventHandler(this TMP_InputField inputField, CancellationToken cancellationToken)
+        {
+            return new AsyncUnityEventHandler<string>(inputField.onDeselect, cancellationToken, false);
+        }
+
+        public static UniTask<string> OnDeselectAsync(this TMP_InputField inputField)
+        {
+            return new AsyncUnityEventHandler<string>(inputField.onDeselect, inputField.GetCancellationTokenOnDestroy(), true).OnInvokeAsync();
+        }
+
+        public static UniTask<string> OnDeselectAsync(this TMP_InputField inputField, CancellationToken cancellationToken)
+        {
+            return new AsyncUnityEventHandler<string>(inputField.onDeselect, cancellationToken, true).OnInvokeAsync();
+        }
+
+        public static IUniTaskAsyncEnumerable<string> OnDeselectAsAsyncEnumerable(this TMP_InputField inputField)
+        {
+            return new UnityEventHandlerAsyncEnumerable<string>(inputField.onDeselect, inputField.GetCancellationTokenOnDestroy());
+        }
+
+        public static IUniTaskAsyncEnumerable<string> OnDeselectAsAsyncEnumerable(this TMP_InputField inputField, CancellationToken cancellationToken)
+        {
+            return new UnityEventHandlerAsyncEnumerable<string>(inputField.onDeselect, cancellationToken);
+        }
+
+        public static IAsyncSelectEventHandler<string> GetAsyncSelectEventHandler(this TMP_InputField inputField)
+        {
+            return new AsyncUnityEventHandler<string>(inputField.onSelect, inputField.GetCancellationTokenOnDestroy(), false);
+        }
+
+        public static IAsyncSelectEventHandler<string> GetAsyncSelectEventHandler(this TMP_InputField inputField, CancellationToken cancellationToken)
+        {
+            return new AsyncUnityEventHandler<string>(inputField.onSelect, cancellationToken, false);
+        }
+
+        public static UniTask<string> OnSelectAsync(this TMP_InputField inputField)
+        {
+            return new AsyncUnityEventHandler<string>(inputField.onSelect, inputField.GetCancellationTokenOnDestroy(), true).OnInvokeAsync();
+        }
+
+        public static UniTask<string> OnSelectAsync(this TMP_InputField inputField, CancellationToken cancellationToken)
+        {
+            return new AsyncUnityEventHandler<string>(inputField.onSelect, cancellationToken, true).OnInvokeAsync();
+        }
+
+        public static IUniTaskAsyncEnumerable<string> OnSelectAsAsyncEnumerable(this TMP_InputField inputField)
+        {
+            return new UnityEventHandlerAsyncEnumerable<string>(inputField.onSelect, inputField.GetCancellationTokenOnDestroy());
+        }
+
+        public static IUniTaskAsyncEnumerable<string> OnSelectAsAsyncEnumerable(this TMP_InputField inputField, CancellationToken cancellationToken)
+        {
+            return new UnityEventHandlerAsyncEnumerable<string>(inputField.onSelect, cancellationToken);
+        }
+
+        public static IAsyncSubmitEventHandler<string> GetAsyncSubmitEventHandler(this TMP_InputField inputField)
+        {
+            return new AsyncUnityEventHandler<string>(inputField.onSubmit, inputField.GetCancellationTokenOnDestroy(), false);
+        }
+
+        public static IAsyncSubmitEventHandler<string> GetAsyncSubmitEventHandler(this TMP_InputField inputField, CancellationToken cancellationToken)
+        {
+            return new AsyncUnityEventHandler<string>(inputField.onSubmit, cancellationToken, false);
+        }
+
+        public static UniTask<string> OnSubmitAsync(this TMP_InputField inputField)
+        {
+            return new AsyncUnityEventHandler<string>(inputField.onSubmit, inputField.GetCancellationTokenOnDestroy(), true).OnInvokeAsync();
+        }
+
+        public static UniTask<string> OnSubmitAsync(this TMP_InputField inputField, CancellationToken cancellationToken)
+        {
+            return new AsyncUnityEventHandler<string>(inputField.onSubmit, cancellationToken, true).OnInvokeAsync();
+        }
+
+        public static IUniTaskAsyncEnumerable<string> OnSubmitAsAsyncEnumerable(this TMP_InputField inputField)
+        {
+            return new UnityEventHandlerAsyncEnumerable<string>(inputField.onSubmit, inputField.GetCancellationTokenOnDestroy());
+        }
+
+        public static IUniTaskAsyncEnumerable<string> OnSubmitAsAsyncEnumerable(this TMP_InputField inputField, CancellationToken cancellationToken)
+        {
+            return new UnityEventHandlerAsyncEnumerable<string>(inputField.onSubmit, cancellationToken);
+        }
+
+    }
+}
+
+#endif

src/UniTask/Assets/Plugins/UniTask/Runtime/External/TextMeshPro/TextMeshProAsyncExtensions.InputField.cs.meta

@@ -1,5 +1,5 @@
 fileFormatVersion: 2
-guid: 4d5a9a3e1f0f069478969f752fde29a9
+guid: 79f4f2475e0b2c44e97ed1dee760627b
 MonoImporter:
   externalObjects: {}
   serializedVersion: 2

src/UniTask/Assets/Plugins/UniTask/Runtime/External/TextMeshPro/TextMeshProAsyncExtensions.InputField.tt

@@ -0,0 +1,66 @@
+<#@ template debug="false" hostspecific="false" language="C#" #>
+<#@ assembly name="System.Core" #>
+<#@ import namespace="System.Linq" #>
+<#@ import namespace="System.Text" #>
+<#@ import namespace="System.Collections.Generic" #>
+<#@ output extension=".cs" #>
+<#
+    var handlers = new (string name, string type)[] {
+        ("ValueChanged", "string"),
+        ("EndEdit", "string"),
+        ("EndTextSelection", "(string, int, int)"),
+        ("TextSelection", "(string, int, int)"),
+        ("Deselect", "string"),
+        ("Select", "string"),
+        ("Submit", "string"),
+    };
+
+    Func<string, bool> shouldConvert = x => x.EndsWith("TextSelection");
+    Func<string, string> eventName = x => shouldConvert(x) ? $"new TextSelectionEventConverter(inputField.on{x})" : $"inputField.on{x}";
+#>
+#if UNITASK_TEXTMESHPRO_SUPPORT
+
+using System;
+using System.Threading;
+using TMPro;
+
+namespace Cysharp.Threading.Tasks
+{
+    public static partial class TextMeshProAsyncExtensions
+    {
+<# foreach(var (name, type) in handlers) { #>
+        public static IAsync<#= (name) #>EventHandler<<#= type #>> GetAsync<#= (name) #>EventHandler(this TMP_InputField inputField)
+        {
+            return new AsyncUnityEventHandler<<#= type #>>(<#= eventName(name) #>, inputField.GetCancellationTokenOnDestroy(), false);
+        }
+
+        public static IAsync<#= (name) #>EventHandler<<#= type #>> GetAsync<#= (name) #>EventHandler(this TMP_InputField inputField, CancellationToken cancellationToken)
+        {
+            return new AsyncUnityEventHandler<<#= type #>>(<#= eventName(name) #>, cancellationToken, false);
+        }
+
+        public static UniTask<<#= type #>> On<#= (name) #>Async(this TMP_InputField inputField)
+        {
+            return new AsyncUnityEventHandler<<#= type #>>(<#= eventName(name) #>, inputField.GetCancellationTokenOnDestroy(), true).OnInvokeAsync();
+        }
+
+        public static UniTask<<#= type #>> On<#= (name) #>Async(this TMP_InputField inputField, CancellationToken cancellationToken)
+        {
+            return new AsyncUnityEventHandler<<#= type #>>(<#= eventName(name) #>, cancellationToken, true).OnInvokeAsync();
+        }
+
+        public static IUniTaskAsyncEnumerable<<#= type #>> On<#= (name) #>AsAsyncEnumerable(this TMP_InputField inputField)
+        {
+            return new UnityEventHandlerAsyncEnumerable<<#= type #>>(<#= eventName(name) #>, inputField.GetCancellationTokenOnDestroy());
+        }
+
+        public static IUniTaskAsyncEnumerable<<#= type #>> On<#= (name) #>AsAsyncEnumerable(this TMP_InputField inputField, CancellationToken cancellationToken)
+        {
+            return new UnityEventHandlerAsyncEnumerable<<#= type #>>(<#= eventName(name) #>, cancellationToken);
+        }
+
+<# } #>
+    }
+}
+
+#endif

src/UniTask/Assets/Plugins/UniTask/Runtime/External/TextMeshPro/TextMeshProAsyncExtensions.InputField.tt.meta

@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: e9bb9fc551a975d44a7180e022a2debe
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

src/UniTask/Assets/Plugins/UniTask/Runtime/External/TextMeshPro/TextMeshProAsyncExtensions.cs

@@ -0,0 +1,130 @@
+#if UNITASK_TEXTMESHPRO_SUPPORT
+
+using System;
+using System.Threading;
+using TMPro;
+using UnityEngine.Events;
+
+namespace Cysharp.Threading.Tasks
+{
+    public static partial class TextMeshProAsyncExtensions
+    {
+        // <string> -> Text
+        public static void BindTo(this IUniTaskAsyncEnumerable<string> source, TMP_Text text, bool rebindOnError = true)
+        {
+            BindToCore(source, text, text.GetCancellationTokenOnDestroy(), rebindOnError).Forget();
+        }
+
+        public static void BindTo(this IUniTaskAsyncEnumerable<string> source, TMP_Text text, CancellationToken cancellationToken, bool rebindOnError = true)
+        {
+            BindToCore(source, text, cancellationToken, rebindOnError).Forget();
+        }
+
+        static async UniTaskVoid BindToCore(IUniTaskAsyncEnumerable<string> source, TMP_Text text, CancellationToken cancellationToken, bool rebindOnError)
+        {
+            var repeat = false;
+            BIND_AGAIN:
+            var e = source.GetAsyncEnumerator(cancellationToken);
+            try
+            {
+                while (true)
+                {
+                    bool moveNext;
+                    try
+                    {
+                        moveNext = await e.MoveNextAsync();
+                        repeat = false;
+                    }
+                    catch (Exception ex)
+                    {
+                        if (ex is OperationCanceledException) return;
+
+                        if (rebindOnError && !repeat)
+                        {
+                            repeat = true;
+                            goto BIND_AGAIN;
+                        }
+                        else
+                        {
+                            throw;
+                        }
+                    }
+
+                    if (!moveNext) return;
+
+                    text.text = e.Current;
+                }
+            }
+            finally
+            {
+                if (e != null)
+                {
+                    await e.DisposeAsync();
+                }
+            }
+        }
+
+        // <T> -> Text
+
+        public static void BindTo<T>(this IUniTaskAsyncEnumerable<T> source, TMP_Text text, bool rebindOnError = true)
+        {
+            BindToCore(source, text, text.GetCancellationTokenOnDestroy(), rebindOnError).Forget();
+        }
+
+        public static void BindTo<T>(this IUniTaskAsyncEnumerable<T> source, TMP_Text text, CancellationToken cancellationToken, bool rebindOnError = true)
+        {
+            BindToCore(source, text, cancellationToken, rebindOnError).Forget();
+        }
+
+        public static void BindTo<T>(this AsyncReactiveProperty<T> source, TMP_Text text, bool rebindOnError = true)
+        {
+            BindToCore(source, text, text.GetCancellationTokenOnDestroy(), rebindOnError).Forget();
+        }
+
+        static async UniTaskVoid BindToCore<T>(IUniTaskAsyncEnumerable<T> source, TMP_Text text, CancellationToken cancellationToken, bool rebindOnError)
+        {
+            var repeat = false;
+            BIND_AGAIN:
+            var e = source.GetAsyncEnumerator(cancellationToken);
+            try
+            {
+                while (true)
+                {
+                    bool moveNext;
+                    try
+                    {
+                        moveNext = await e.MoveNextAsync();
+                        repeat = false;
+                    }
+                    catch (Exception ex)
+                    {
+                        if (ex is OperationCanceledException) return;
+
+                        if (rebindOnError && !repeat)
+                        {
+                            repeat = true;
+                            goto BIND_AGAIN;
+                        }
+                        else
+                        {
+                            throw;
+                        }
+                    }
+
+                    if (!moveNext) return;
+
+                    text.text = e.Current.ToString();
+                }
+            }
+            finally
+            {
+                if (e != null)
+                {
+                    await e.DisposeAsync();
+                }
+            }
+        }
+    }
+}
+
+#endif

src/UniTask/Assets/Plugins/UniTask/Runtime/External/TextMeshPro/TextMeshProAsyncExtensions.cs.meta

@@ -1,5 +1,5 @@
 fileFormatVersion: 2
-guid: fcb1f7467a3e2b64c8a016c8aee2f9b4
+guid: b6ba480edafb67d4e91bb10feb64fae5
 MonoImporter:
   externalObjects: {}
   serializedVersion: 2

src/UniTask/Assets/Plugins/UniTask/Runtime/External/TextMeshPro/UniTask.TextMeshPro.asmdef

@@ -0,0 +1,22 @@
+{
+    "name": "UniTask.TextMeshPro",
+    "references": [
+        "UniTask",
+        "Unity.TextMeshPro"
+    ],
+    "includePlatforms": [],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": false,
+    "precompiledReferences": [],
+    "autoReferenced": true,
+    "defineConstraints": [],
+    "versionDefines": [
+        {
+            "name": "com.unity.textmeshpro",
+            "expression": "",
+            "define": "UNITASK_TEXTMESHPRO_SUPPORT"
+        }
+    ],
+    "noEngineReferences": false
+}

src/UniTask/Assets/Plugins/UniTask/Runtime/External/TextMeshPro/UniTask.TextMeshPro.asmdef.meta

@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: dc47925d1a5fa2946bdd37746b2b5d48
+AssemblyDefinitionImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

src/UniTask/Assets/Plugins/UniTask/Runtime/IUniTaskSource.cs

@@ -19,7 +19,7 @@ namespace Cysharp.Threading.Tasks
 
     // similar as IValueTaskSource
     public interface IUniTaskSource
-#if !UNITY_2018_3_OR_NEWER
+#if !UNITY_2018_3_OR_NEWER && !NETSTANDARD2_0
         : System.Threading.Tasks.Sources.IValueTaskSource
 #pragma warning disable CS0108
 #endif
@@ -30,7 +30,7 @@ namespace Cysharp.Threading.Tasks
 
         UniTaskStatus UnsafeGetStatus(); // only for debug use.
 
-#if !UNITY_2018_3_OR_NEWER
+#if !UNITY_2018_3_OR_NEWER && !NETSTANDARD2_0
 #pragma warning restore CS0108
 
         System.Threading.Tasks.Sources.ValueTaskSourceStatus System.Threading.Tasks.Sources.IValueTaskSource.GetStatus(short token)
@@ -53,13 +53,13 @@ namespace Cysharp.Threading.Tasks
     }
 
     public interface IUniTaskSource<out T> : IUniTaskSource
-#if !UNITY_2018_3_OR_NEWER
+#if !UNITY_2018_3_OR_NEWER && !NETSTANDARD2_0
         , System.Threading.Tasks.Sources.IValueTaskSource<T>
 #endif
     {
         new T GetResult(short token);
 
-#if !UNITY_2018_3_OR_NEWER
+#if !UNITY_2018_3_OR_NEWER && !NETSTANDARD2_0
 
         new public UniTaskStatus GetStatus(short token)
         {

src/UniTask/Assets/Plugins/UniTask/Runtime/Internal/ContinuationQueue.cs

@@ -9,10 +9,10 @@ namespace Cysharp.Threading.Tasks.Internal
     {
         const int MaxArrayLength = 0X7FEFFFFF;
         const int InitialSize = 16;
-        
+
         readonly PlayerLoopTiming timing;
 
-        SpinLock gate = new SpinLock();
+        SpinLock gate = new SpinLock(false);
         bool dequing = false;
 
         int actionListCount = 0;
@@ -70,13 +70,17 @@ namespace Cysharp.Threading.Tasks.Internal
             }
         }
 
-        public void Clear()
+        public int Clear()
         {
+            var rest = actionListCount + waitingListCount;
+
             actionListCount = 0;
             actionList = new Action[InitialSize];
 
             waitingListCount = 0;
             waitingList = new Action[InitialSize];
+
+            return rest;
         }
 
         // delegate entrypoint.
@@ -128,6 +132,14 @@ namespace Cysharp.Threading.Tasks.Internal
                 case PlayerLoopTiming.LastPostLateUpdate:
                     LastPostLateUpdate();
                     break;
+#if UNITY_2020_2_OR_NEWER
+                case PlayerLoopTiming.TimeUpdate:
+                    TimeUpdate();
+                    break;
+                case PlayerLoopTiming.LastTimeUpdate:
+                    LastTimeUpdate();
+                    break;
+#endif
                 default:
                     break;
             }
@@ -150,6 +162,10 @@ namespace Cysharp.Threading.Tasks.Internal
         void LastPreLateUpdate() => RunCore();
         void PostLateUpdate() => RunCore();
         void LastPostLateUpdate() => RunCore();
+#if UNITY_2020_2_OR_NEWER
+        void TimeUpdate() => RunCore();
+        void LastTimeUpdate() => RunCore();
+#endif
 
         [System.Diagnostics.DebuggerHidden]
         void RunCore()
@@ -170,10 +186,17 @@ namespace Cysharp.Threading.Tasks.Internal
 
             for (int i = 0; i < actionListCount; i++)
             {
+
                 var action = actionList[i];
                 actionList[i] = null;
-
+                try
-                action();
+                {
+                    action();
+                }
+                catch (Exception ex)
+                {
+                    UnityEngine.Debug.LogException(ex);
+                }
             }
 
             {

src/UniTask/Assets/Plugins/UniTask/Runtime/Internal/DiagnosticsExtensions.cs

@@ -239,7 +239,7 @@ namespace Cysharp.Threading.Tasks.Internal
             }
             else
             {
-                var fname = fi.FullName.Replace(Path.DirectorySeparatorChar, '/').Replace(Application.dataPath, "");
+                var fname = fi.FullName.Replace(Path.DirectorySeparatorChar, '/').Replace(PlayerLoopHelper.ApplicationDataPath, "");
                 var withAssetsPath = "Assets/" + fname;
                 return "<a href=\"" + withAssetsPath + "\" line=\"" + line + "\">" + withAssetsPath + ":" + line + "</a>";
             }

src/UniTask/Assets/Plugins/UniTask/Runtime/Internal/Hack.cs

@@ -1,23 +0,0 @@
-#if NET_4_6 || NET_STANDARD_2_0 || CSHARP_7_OR_LATER
-
-using System;
-
-namespace Cysharp.Threading.Tasks.Internal
-{
-    internal static class FuncExtensions
-    {
-        // avoid lambda capture
-
-        internal static Action<T> AsFuncOfT<T>(this Action action)
-        {
-            return new Action<T>(action.Invoke);
-        }
-
-        static void Invoke<T>(this Action action, T unused)
-        {
-            action();
-        }
-    }
-}
-
-#endif

src/UniTask/Assets/Plugins/UniTask/Runtime/Internal/PlayerLoopRunner.cs

@@ -48,14 +48,24 @@ namespace Cysharp.Threading.Tasks.Internal
             }
         }
 
-        public void Clear()
+        public int Clear()
         {
             lock (arrayLock)
             {
+                var rest = 0;
+
                 for (var index = 0; index < loopItems.Length; index++)
                 {
+                    if (loopItems[index] != null)
+                    {
+                        rest++;
+                    }
+
                     loopItems[index] = null;
                 }
+
+                tail = 0;
+                return rest;
             }
         }
 
@@ -108,6 +118,14 @@ namespace Cysharp.Threading.Tasks.Internal
                 case PlayerLoopTiming.LastPostLateUpdate:
                     LastPostLateUpdate();
                     break;
+#if UNITY_2020_2_OR_NEWER
+                case PlayerLoopTiming.TimeUpdate:
+                    TimeUpdate();
+                    break;
+                case PlayerLoopTiming.LastTimeUpdate:
+                    LastTimeUpdate();
+                    break;
+#endif
                 default:
                     break;
             }
@@ -130,6 +148,10 @@ namespace Cysharp.Threading.Tasks.Internal
         void LastPreLateUpdate() => RunCore();
         void PostLateUpdate() => RunCore();
         void LastPostLateUpdate() => RunCore();
+#if UNITY_2020_2_OR_NEWER
+        void TimeUpdate() => RunCore();
+        void LastTimeUpdate() => RunCore();
+#endif
 
         [System.Diagnostics.DebuggerHidden]
         void RunCore()
@@ -143,7 +165,6 @@ namespace Cysharp.Threading.Tasks.Internal
             {
                 var j = tail - 1;
 
-                // eliminate array-bound check for i
                 for (int i = 0; i < loopItems.Length; i++)
                 {
                     var action = loopItems[i];

src/UniTask/Assets/Plugins/UniTask/Runtime/Internal/PooledDelegate.cs

@@ -7,11 +7,12 @@ namespace Cysharp.Threading.Tasks.Internal
     {
         static TaskPool<PooledDelegate<T>> pool;
 
-        public PooledDelegate<T> NextNode { get; set; }
+        PooledDelegate<T> nextNode;
+        public ref PooledDelegate<T> NextNode => ref nextNode;
 
         static PooledDelegate()
         {
-            TaskPoolMonitor.RegisterSizeGetter(typeof(PooledDelegate<T>), () => pool.Size);
+            TaskPool.RegisterSizeGetter(typeof(PooledDelegate<T>), () => pool.Size);
         }
 
         readonly Action<T> runDelegate;

src/UniTask/Assets/Plugins/UniTask/Runtime/Internal/TaskTracker.cs

@@ -60,9 +60,9 @@ namespace Cysharp.Threading.Tasks
 #endif
 
 
-        static List<KeyValuePair<IUniTaskSource, (int trackingId, DateTime addTime, string stackTrace)>> listPool = new List<KeyValuePair<IUniTaskSource, (int trackingId, DateTime addTime, string stackTrace)>>();
+        static List<KeyValuePair<IUniTaskSource, (string formattedType, int trackingId, DateTime addTime, string stackTrace)>> listPool = new List<KeyValuePair<IUniTaskSource, (string formattedType, int trackingId, DateTime addTime, string stackTrace)>>();
 
-        static readonly WeakDictionary<IUniTaskSource, (int trackingId, DateTime addTime, string stackTrace)> tracking = new WeakDictionary<IUniTaskSource, (int trackingId, DateTime addTime, string stackTrace)>();
+        static readonly WeakDictionary<IUniTaskSource, (string formattedType, int trackingId, DateTime addTime, string stackTrace)> tracking = new WeakDictionary<IUniTaskSource, (string formattedType, int trackingId, DateTime addTime, string stackTrace)>();
 
         [Conditional("UNITY_EDITOR")]
         public static void TrackActiveTask(IUniTaskSource task, int skipFrame)
@@ -71,7 +71,19 @@ namespace Cysharp.Threading.Tasks
             dirty = true;
             if (!EditorEnableState.EnableTracking) return;
             var stackTrace = EditorEnableState.EnableStackTrace ? new StackTrace(skipFrame, true).CleanupAsyncStackTrace() : "";
-            tracking.TryAdd(task, (Interlocked.Increment(ref trackingId), DateTime.UtcNow, stackTrace));
+
+            string typeName;
+            if (EditorEnableState.EnableStackTrace)
+            {
+                var sb = new StringBuilder();
+                TypeBeautify(task.GetType(), sb);
+                typeName = sb.ToString();
+            }
+            else
+            {
+                typeName = task.GetType().Name;
+            }
+            tracking.TryAdd(task, (typeName, Interlocked.Increment(ref trackingId), DateTime.UtcNow, stackTrace));
 #endif
         }
 
@@ -104,14 +116,8 @@ namespace Cysharp.Threading.Tasks
                 {
                     for (int i = 0; i < count; i++)
                     {
-                        var keyType = listPool[i].Key.GetType();
+                        action(listPool[i].Value.trackingId, listPool[i].Value.formattedType, listPool[i].Key.UnsafeGetStatus(), listPool[i].Value.addTime, listPool[i].Value.stackTrace);
-
+                        listPool[i] = default;
-                        var sb = new StringBuilder();
-                        TypeBeautify(keyType, sb);
-                        var typeName = sb.ToString();
-
-                        action(listPool[i].Value.trackingId, typeName, listPool[i].Key.UnsafeGetStatus(), listPool[i].Value.addTime, listPool[i].Value.stackTrace);
-                        listPool[i] = new KeyValuePair<IUniTaskSource, (int trackingId, DateTime addTime, string stackTrace)>(null, (0, default(DateTime), null)); // clear
                     }
                 }
                 catch
@@ -126,17 +132,31 @@ namespace Cysharp.Threading.Tasks
         {
             if (type.IsNested)
             {
-                TypeBeautify(type.DeclaringType, sb);
+                // TypeBeautify(type.DeclaringType, sb);
+                sb.Append(type.DeclaringType.Name.ToString());
                 sb.Append(".");
             }
 
             if (type.IsGenericType)
             {
                 var genericsStart = type.Name.IndexOf("`");
-                sb.Append(type.Name.Substring(0, genericsStart));
+                if (genericsStart != -1)
+                {
+                    sb.Append(type.Name.Substring(0, genericsStart));
+                }
+                else
+                {
+                    sb.Append(type.Name);
+                }
                 sb.Append("<");
+                var first = true;
                 foreach (var item in type.GetGenericArguments())
                 {
+                    if (!first)
+                    {
+                        sb.Append(", ");
+                    }
+                    first = false;
                     TypeBeautify(item, sb);
                 }
                 sb.Append(">");
@@ -146,6 +166,13 @@ namespace Cysharp.Threading.Tasks
                 sb.Append(type.Name);
             }
         }
+
+        //static string RemoveUniTaskNamespace(string str)
+        //{
+        //    return str.Replace("Cysharp.Threading.Tasks.CompilerServices", "")
+        //        .Replace("Cysharp.Threading.Tasks.Linq", "")
+        //        .Replace("Cysharp.Threading.Tasks", "");
+        //}
     }
 }
 

src/UniTask/Assets/Plugins/UniTask/Runtime/Internal/UnityWebRequestExtensions.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using UnityEngine.Networking;
+
+namespace Cysharp.Threading.Tasks.Internal
+{
+#if ENABLE_UNITYWEBREQUEST && (!UNITY_2019_1_OR_NEWER || UNITASK_WEBREQUEST_SUPPORT)
+    
+    internal static class UnityWebRequestResultExtensions
+    {
+        public static bool IsError(this UnityWebRequest unityWebRequest)
+        {
+#if UNITY_2020_2_OR_NEWER
+            var result = unityWebRequest.result;
+            return (result == UnityWebRequest.Result.ConnectionError)
+                || (result == UnityWebRequest.Result.DataProcessingError)
+                || (result == UnityWebRequest.Result.ProtocolError);
+#else
+            return unityWebRequest.isHttpError || unityWebRequest.isNetworkError;
+#endif
+        }
+    }
+
+#endif
+}

src/UniTask/Assets/Plugins/UniTask/Runtime/Internal/UnityWebRequestExtensions.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 111ba0e639de1d7428af6c823ead4918
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

src/UniTask/Assets/Plugins/UniTask/Runtime/Internal/ValueStopwatch.cs

@@ -0,0 +1,37 @@
+using System;
+using System.Diagnostics;
+
+namespace Cysharp.Threading.Tasks.Internal
+{
+    internal readonly struct ValueStopwatch
+    {
+        static readonly double TimestampToTicks = TimeSpan.TicksPerSecond / (double)Stopwatch.Frequency;
+
+        readonly long startTimestamp;
+
+        public static ValueStopwatch StartNew() => new ValueStopwatch(Stopwatch.GetTimestamp());
+
+        ValueStopwatch(long startTimestamp)
+        {
+            this.startTimestamp = startTimestamp;
+        }
+
+        public TimeSpan Elapsed => TimeSpan.FromTicks(this.ElapsedTicks);
+
+        public bool IsInvalid => startTimestamp == 0;
+
+        public long ElapsedTicks
+        {
+            get
+            {
+                if (startTimestamp == 0)
+                {
+                    throw new InvalidOperationException("Detected invalid initialization(use 'default'), only to create from StartNew().");
+                }
+
+                var delta = Stopwatch.GetTimestamp() - startTimestamp;
+                return (long)(delta * TimestampToTicks);
+            }
+        }
+    }
+}

src/UniTask/Assets/Plugins/UniTask/Runtime/Internal/ValueStopwatch.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: f16fb466974ad034c8732c79c7fd67ea
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/AsyncEnumeratorBase.cs

@@ -3,66 +3,9 @@ using System.Threading;
 
 namespace Cysharp.Threading.Tasks.Linq
 {
-    public abstract class MoveNextSource : IUniTaskSource<bool>
+    // note: refactor all inherit class and should remove this.
-    {
+    // see Select and Where.
-        protected UniTaskCompletionSourceCore<bool> completionSource;
+    internal abstract class AsyncEnumeratorBase<TSource, TResult> : MoveNextSource, IUniTaskAsyncEnumerator<TResult>
-
-        public bool GetResult(short token)
-        {
-            return completionSource.GetResult(token);
-        }
-
-        public UniTaskStatus GetStatus(short token)
-        {
-            return completionSource.GetStatus(token);
-        }
-
-        public void OnCompleted(Action<object> continuation, object state, short token)
-        {
-            completionSource.OnCompleted(continuation, state, token);
-        }
-
-        public UniTaskStatus UnsafeGetStatus()
-        {
-            return completionSource.UnsafeGetStatus();
-        }
-
-        void IUniTaskSource.GetResult(short token)
-        {
-            completionSource.GetResult(token);
-        }
-
-        protected bool TryGetResult<T>(UniTask<T>.Awaiter awaiter, out T result)
-        {
-            try
-            {
-                result = awaiter.GetResult();
-                return true;
-            }
-            catch (Exception ex)
-            {
-                completionSource.TrySetException(ex);
-                result = default;
-                return false;
-            }
-        }
-
-        protected bool TryGetResult(UniTask.Awaiter awaiter)
-        {
-            try
-            {
-                awaiter.GetResult();
-                return true;
-            }
-            catch (Exception ex)
-            {
-                completionSource.TrySetException(ex);
-                return false;
-            }
-        }
-    }
-
-    public abstract class AsyncEnumeratorBase<TSource, TResult> : MoveNextSource, IUniTaskAsyncEnumerator<TResult>
     {
         static readonly Action<object> moveNextCallbackDelegate = MoveNextCallBack;
 
@@ -188,7 +131,7 @@ namespace Cysharp.Threading.Tasks.Linq
         }
     }
 
-    public abstract class AsyncEnumeratorAwaitSelectorBase<TSource, TResult, TAwait> : MoveNextSource, IUniTaskAsyncEnumerator<TResult>
+    internal abstract class AsyncEnumeratorAwaitSelectorBase<TSource, TResult, TAwait> : MoveNextSource, IUniTaskAsyncEnumerator<TResult>
     {
         static readonly Action<object> moveNextCallbackDelegate = MoveNextCallBack;
         static readonly Action<object> setCurrentCallbackDelegate = SetCurrentCallBack;
@@ -410,5 +353,4 @@ namespace Cysharp.Threading.Tasks.Linq
             return default;
         }
     }
-
 }

src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Create.cs

@@ -0,0 +1,174 @@
+using Cysharp.Threading.Tasks.Internal;
+using System;
+using System.Threading;
+
+namespace Cysharp.Threading.Tasks.Linq
+{
+    public static partial class UniTaskAsyncEnumerable
+    {
+        public static IUniTaskAsyncEnumerable<T> Create<T>(Func<IAsyncWriter<T>, CancellationToken, UniTask> create)
+        {
+            Error.ThrowArgumentNullException(create, nameof(create));
+            return new Create<T>(create);
+        }
+    }
+
+    public interface IAsyncWriter<T>
+    {
+        UniTask YieldAsync(T value);
+    }
+
+    internal sealed class Create<T> : IUniTaskAsyncEnumerable<T>
+    {
+        readonly Func<IAsyncWriter<T>, CancellationToken, UniTask> create;
+
+        public Create(Func<IAsyncWriter<T>, CancellationToken, UniTask> create)
+        {
+            this.create = create;
+        }
+
+        public IUniTaskAsyncEnumerator<T> GetAsyncEnumerator(CancellationToken cancellationToken = default)
+        {
+            return new _Create(create, cancellationToken);
+        }
+
+        sealed class _Create : MoveNextSource, IUniTaskAsyncEnumerator<T>
+        {
+            readonly Func<IAsyncWriter<T>, CancellationToken, UniTask> create;
+            readonly CancellationToken cancellationToken;
+
+            int state = -1;
+            AsyncWriter writer;
+
+            public _Create(Func<IAsyncWriter<T>, CancellationToken, UniTask> create, CancellationToken cancellationToken)
+            {
+                this.create = create;
+                this.cancellationToken = cancellationToken;
+                TaskTracker.TrackActiveTask(this, 3);
+            }
+
+            public T Current { get; private set; }
+
+            public UniTask DisposeAsync()
+            {
+                TaskTracker.RemoveTracking(this);
+                return default;
+            }
+
+            public UniTask<bool> MoveNextAsync()
+            {
+                if (state == -2) return default;
+
+                completionSource.Reset();
+                MoveNext();
+                return new UniTask<bool>(this, completionSource.Version);
+            }
+
+            void MoveNext()
+            {
+                try
+                {
+                    switch (state)
+                    {
+                        case -1: // init
+                            {
+                                writer = new AsyncWriter(this);
+                                RunWriterTask(create(writer, cancellationToken)).Forget();
+                                if (Volatile.Read(ref state) == -2)
+                                {
+                                    return; // complete synchronously
+                                }
+                                state = 0; // wait YieldAsync, it set TrySetResult(true)
+                                return;
+                            }
+                        case 0:
+                            writer.SignalWriter();
+                            return;
+                        default:
+                            goto DONE;
+                    }
+                }
+                catch (Exception ex)
+                {
+                    state = -2;
+                    completionSource.TrySetException(ex);
+                    return;
+                }
+
+                DONE:
+                state = -2;
+                completionSource.TrySetResult(false);
+                return;
+            }
+
+            async UniTaskVoid RunWriterTask(UniTask task)
+            {
+                try
+                {
+                    await task;
+                    goto DONE;
+                }
+                catch (Exception ex)
+                {
+                    Volatile.Write(ref state, -2);
+                    completionSource.TrySetException(ex);
+                    return;
+                }
+
+                DONE:
+                Volatile.Write(ref state, -2);
+                completionSource.TrySetResult(false);
+            }
+
+            public void SetResult(T value)
+            {
+                Current = value;
+                completionSource.TrySetResult(true);
+            }
+        }
+
+        sealed class AsyncWriter : IUniTaskSource, IAsyncWriter<T>
+        {
+            readonly _Create enumerator;
+
+            UniTaskCompletionSourceCore<AsyncUnit> core;
+
+            public AsyncWriter(_Create enumerator)
+            {
+                this.enumerator = enumerator;
+            }
+
+            public void GetResult(short token)
+            {
+                core.GetResult(token);
+            }
+
+            public UniTaskStatus GetStatus(short token)
+            {
+                return core.GetStatus(token);
+            }
+
+            public UniTaskStatus UnsafeGetStatus()
+            {
+                return core.UnsafeGetStatus();
+            }
+
+            public void OnCompleted(Action<object> continuation, object state, short token)
+            {
+                core.OnCompleted(continuation, state, token);
+            }
+
+            public UniTask YieldAsync(T value)
+            {
+                core.Reset();
+                enumerator.SetResult(value);
+                return new UniTask(this, core.Version);
+            }
+
+            public void SignalWriter()
+            {
+                core.TrySetResult(AsyncUnit.Default);
+            }
+        }
+    }
+}

src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Create.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 0202f723469f93945afa063bfb440d15
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/DistinctUntilChanged.cs

@@ -79,41 +79,123 @@ namespace Cysharp.Threading.Tasks.Linq
             return new _DistinctUntilChanged(source, comparer, cancellationToken);
         }
 
-        class _DistinctUntilChanged : AsyncEnumeratorBase<TSource, TSource>
+        sealed class _DistinctUntilChanged : MoveNextSource, IUniTaskAsyncEnumerator<TSource>
         {
+            readonly IUniTaskAsyncEnumerable<TSource> source;
             readonly IEqualityComparer<TSource> comparer;
-            TSource prev;
+            readonly CancellationToken cancellationToken;
-            bool first;
+
+            int state = -1;
+            IUniTaskAsyncEnumerator<TSource> enumerator;
+            UniTask<bool>.Awaiter awaiter;
+            Action moveNextAction;
 
             public _DistinctUntilChanged(IUniTaskAsyncEnumerable<TSource> source, IEqualityComparer<TSource> comparer, CancellationToken cancellationToken)
-
-                : base(source, cancellationToken)
             {
+                this.source = source;
                 this.comparer = comparer;
-                this.first = true;
+                this.cancellationToken = cancellationToken;
+                this.moveNextAction = MoveNext;
             }
 
-            protected override bool TryMoveNextCore(bool sourceHasCurrent, out bool result)
+            public TSource Current { get; private set; }
+
+            public UniTask<bool> MoveNextAsync()
             {
-                if (sourceHasCurrent)
+                if (state == -2) return default;
+
+                completionSource.Reset();
+                MoveNext();
+                return new UniTask<bool>(this, completionSource.Version);
+            }
+
+            void MoveNext()
+            {
+                REPEAT:
+                try
                 {
-                    var v = SourceCurrent;
+                    switch (state)
-                    if (first || !comparer.Equals(prev, v))
                     {
-                        first = false;
+                        case -1: // init
-                        Current = prev = v;
+                            enumerator = source.GetAsyncEnumerator(cancellationToken);
-                        result = true;
+                            awaiter = enumerator.MoveNextAsync().GetAwaiter();
-                        return true;
+                            if (awaiter.IsCompleted)
-                    }
+                            {
-                    else
+                                goto case -3;
-                    {
+                            }
-                        result = default;
+                            else
-                        return false;
+                            {
+                                state = -3;
+                                awaiter.UnsafeOnCompleted(moveNextAction);
+                                return;
+                            }
+                        case -3: // first
+                            if (awaiter.GetResult())
+                            {
+                                Current = enumerator.Current;
+                                goto CONTINUE;
+                            }
+                            else
+                            {
+                                goto DONE;
+                            }
+                        case 0: // normal
+                            awaiter = enumerator.MoveNextAsync().GetAwaiter();
+                            if (awaiter.IsCompleted)
+                            {
+                                goto case 1;
+                            }
+                            else
+                            {
+                                state = 1;
+                                awaiter.UnsafeOnCompleted(moveNextAction);
+                                return;
+                            }
+                        case 1:
+                            if (awaiter.GetResult())
+                            {
+                                var v = enumerator.Current;
+                                if (!comparer.Equals(Current, v))
+                                {
+                                    Current = v;
+                                    goto CONTINUE;
+                                }
+                                else
+                                {
+                                    state = 0;
+                                    goto REPEAT;
+                                }
+                            }
+                            else
+                            {
+                                goto DONE;
+                            }
+                        case -2:
+                        default:
+                            goto DONE;
                     }
                 }
+                catch (Exception ex)
+                {
+                    state = -2;
+                    completionSource.TrySetException(ex);
+                    return;
+                }
 
-                result = false;
+                DONE:
-                return true;
+                state = -2;
+                completionSource.TrySetResult(false);
+                return;
+
+                CONTINUE:
+                state = 0;
+                completionSource.TrySetResult(true);
+                return;
+            }
+
+            public UniTask DisposeAsync()
+            {
+                return enumerator.DisposeAsync();
             }
         }
     }
@@ -136,45 +218,128 @@ namespace Cysharp.Threading.Tasks.Linq
             return new _DistinctUntilChanged(source, keySelector, comparer, cancellationToken);
         }
 
-        class _DistinctUntilChanged : AsyncEnumeratorBase<TSource, TSource>
+        sealed class _DistinctUntilChanged : MoveNextSource, IUniTaskAsyncEnumerator<TSource>
         {
-            readonly IEqualityComparer<TKey> comparer;
+            readonly IUniTaskAsyncEnumerable<TSource> source;
             readonly Func<TSource, TKey> keySelector;
+            readonly IEqualityComparer<TKey> comparer;
+            readonly CancellationToken cancellationToken;
+
+            int state = -1;
+            IUniTaskAsyncEnumerator<TSource> enumerator;
+            UniTask<bool>.Awaiter awaiter;
+            Action moveNextAction;
             TKey prev;
-            bool first;
 
             public _DistinctUntilChanged(IUniTaskAsyncEnumerable<TSource> source, Func<TSource, TKey> keySelector, IEqualityComparer<TKey> comparer, CancellationToken cancellationToken)
-
-                : base(source, cancellationToken)
             {
-                this.comparer = comparer;
+                this.source = source;
                 this.keySelector = keySelector;
-                this.first = true;
+                this.comparer = comparer;
+                this.cancellationToken = cancellationToken;
+                this.moveNextAction = MoveNext;
             }
 
-            protected override bool TryMoveNextCore(bool sourceHasCurrent, out bool result)
+            public TSource Current { get; private set; }
+
+            public UniTask<bool> MoveNextAsync()
             {
-                if (sourceHasCurrent)
+                if (state == -2) return default;
+
+                completionSource.Reset();
+                MoveNext();
+                return new UniTask<bool>(this, completionSource.Version);
+            }
+
+            void MoveNext()
+            {
+                REPEAT:
+                try
                 {
-                    var v = SourceCurrent;
+                    switch (state)
-                    var key = keySelector(v);
-                    if (first || !comparer.Equals(prev, key))
                     {
-                        first = false;
+                        case -1: // init
-                        prev = key;
+                            enumerator = source.GetAsyncEnumerator(cancellationToken);
-                        Current = v;
+                            awaiter = enumerator.MoveNextAsync().GetAwaiter();
-                        result = true;
+                            if (awaiter.IsCompleted)
-                        return true;
+                            {
-                    }
+                                goto case -3;
-                    else
+                            }
-                    {
+                            else
-                        result = default;
+                            {
-                        return false;
+                                state = -3;
+                                awaiter.UnsafeOnCompleted(moveNextAction);
+                                return;
+                            }
+                        case -3: // first
+                            if (awaiter.GetResult())
+                            {
+                                Current = enumerator.Current;
+                                goto CONTINUE;
+                            }
+                            else
+                            {
+                                goto DONE;
+                            }
+                        case 0: // normal
+                            awaiter = enumerator.MoveNextAsync().GetAwaiter();
+                            if (awaiter.IsCompleted)
+                            {
+                                goto case 1;
+                            }
+                            else
+                            {
+                                state = 1;
+                                awaiter.UnsafeOnCompleted(moveNextAction);
+                                return;
+                            }
+                        case 1:
+                            if (awaiter.GetResult())
+                            {
+                                var v = enumerator.Current;
+                                var key = keySelector(v);
+                                if (!comparer.Equals(prev, key))
+                                {
+                                    prev = key;
+                                    Current = v;
+                                    goto CONTINUE;
+                                }
+                                else
+                                {
+                                    state = 0;
+                                    goto REPEAT;
+                                }
+                            }
+                            else
+                            {
+                                goto DONE;
+                            }
+                        case -2:
+                        default:
+                            goto DONE;
                     }
                 }
+                catch (Exception ex)
+                {
+                    state = -2;
+                    completionSource.TrySetException(ex);
+                    return;
+                }
 
-                result = false;
+                DONE:
-                return true;
+                state = -2;
+                completionSource.TrySetResult(false);
+                return;
+
+                CONTINUE:
+                state = 0;
+                completionSource.TrySetResult(true);
+                return;
+            }
+
+            public UniTask DisposeAsync()
+            {
+                return enumerator.DisposeAsync();
             }
         }
     }
@@ -197,42 +362,142 @@ namespace Cysharp.Threading.Tasks.Linq
             return new _DistinctUntilChangedAwait(source, keySelector, comparer, cancellationToken);
         }
 
-        class _DistinctUntilChangedAwait : AsyncEnumeratorAwaitSelectorBase<TSource, TSource, TKey>
+        sealed class _DistinctUntilChangedAwait : MoveNextSource, IUniTaskAsyncEnumerator<TSource>
         {
-            readonly IEqualityComparer<TKey> comparer;
+            readonly IUniTaskAsyncEnumerable<TSource> source;
             readonly Func<TSource, UniTask<TKey>> keySelector;
+            readonly IEqualityComparer<TKey> comparer;
+            readonly CancellationToken cancellationToken;
+
+            int state = -1;
+            IUniTaskAsyncEnumerator<TSource> enumerator;
+            UniTask<bool>.Awaiter awaiter;
+            UniTask<TKey>.Awaiter awaiter2;
+            Action moveNextAction;
+            TSource enumeratorCurrent;
             TKey prev;
-            bool first;
 
             public _DistinctUntilChangedAwait(IUniTaskAsyncEnumerable<TSource> source, Func<TSource, UniTask<TKey>> keySelector, IEqualityComparer<TKey> comparer, CancellationToken cancellationToken)
-
-                : base(source, cancellationToken)
             {
-                this.comparer = comparer;
+                this.source = source;
                 this.keySelector = keySelector;
-                this.first = true;
+                this.comparer = comparer;
+                this.cancellationToken = cancellationToken;
+                this.moveNextAction = MoveNext;
             }
 
-            protected override UniTask<TKey> TransformAsync(TSource sourceCurrent)
+            public TSource Current { get; private set; }
+
+            public UniTask<bool> MoveNextAsync()
             {
-                return keySelector(sourceCurrent);
+                if (state == -2) return default;
+
+                completionSource.Reset();
+                MoveNext();
+                return new UniTask<bool>(this, completionSource.Version);
             }
 
-            protected override bool TrySetCurrentCore(TKey key, out bool terminateIteration)
+            void MoveNext()
             {
-                if (first || !comparer.Equals(prev, key))
+                REPEAT:
+                try
                 {
-                    first = false;
+                    switch (state)
-                    prev = key;
+                    {
-                    Current = SourceCurrent;
+                        case -1: // init
-                    terminateIteration = false;
+                            enumerator = source.GetAsyncEnumerator(cancellationToken);
-                    return true;
+                            awaiter = enumerator.MoveNextAsync().GetAwaiter();
+                            if (awaiter.IsCompleted)
+                            {
+                                goto case -3;
+                            }
+                            else
+                            {
+                                state = -3;
+                                awaiter.UnsafeOnCompleted(moveNextAction);
+                                return;
+                            }
+                        case -3: // first
+                            if (awaiter.GetResult())
+                            {
+                                Current = enumerator.Current;
+                                goto CONTINUE;
+                            }
+                            else
+                            {
+                                goto DONE;
+                            }
+                        case 0: // normal
+                            awaiter = enumerator.MoveNextAsync().GetAwaiter();
+                            if (awaiter.IsCompleted)
+                            {
+                                goto case 1;
+                            }
+                            else
+                            {
+                                state = 1;
+                                awaiter.UnsafeOnCompleted(moveNextAction);
+                                return;
+                            }
+                        case 1:
+                            if (awaiter.GetResult())
+                            {
+                                enumeratorCurrent = enumerator.Current;
+                                awaiter2 = keySelector(enumeratorCurrent).GetAwaiter();
+                                if (awaiter2.IsCompleted)
+                                {
+                                    goto case 2;
+                                }
+                                else
+                                {
+                                    state = 2;
+                                    awaiter2.UnsafeOnCompleted(moveNextAction);
+                                    return;
+                                }
+                            }
+                            else
+                            {
+                                goto DONE;
+                            }
+                        case 2:
+                            var key = awaiter2.GetResult();
+                            if (!comparer.Equals(prev, key))
+                            {
+                                prev = key;
+                                Current = enumeratorCurrent;
+                                goto CONTINUE;
+                            }
+                            else
+                            {
+                                state = 0;
+                                goto REPEAT;
+                            }
+                        case -2:
+                        default:
+                            goto DONE;
+                    }
                 }
-                else
+                catch (Exception ex)
                 {
-                    terminateIteration = false;
+                    state = -2;
-                    return false;
+                    completionSource.TrySetException(ex);
+                    return;
                 }
+
+                DONE:
+                state = -2;
+                completionSource.TrySetResult(false);
+                return;
+
+                CONTINUE:
+                state = 0;
+                completionSource.TrySetResult(true);
+                return;
+            }
+
+            public UniTask DisposeAsync()
+            {
+                return enumerator.DisposeAsync();
             }
         }
     }
@@ -255,42 +520,142 @@ namespace Cysharp.Threading.Tasks.Linq
             return new _DistinctUntilChangedAwaitWithCancellation(source, keySelector, comparer, cancellationToken);
         }
 
-        class _DistinctUntilChangedAwaitWithCancellation : AsyncEnumeratorAwaitSelectorBase<TSource, TSource, TKey>
+        sealed class _DistinctUntilChangedAwaitWithCancellation : MoveNextSource, IUniTaskAsyncEnumerator<TSource>
         {
-            readonly IEqualityComparer<TKey> comparer;
+            readonly IUniTaskAsyncEnumerable<TSource> source;
             readonly Func<TSource, CancellationToken, UniTask<TKey>> keySelector;
+            readonly IEqualityComparer<TKey> comparer;
+            readonly CancellationToken cancellationToken;
+
+            int state = -1;
+            IUniTaskAsyncEnumerator<TSource> enumerator;
+            UniTask<bool>.Awaiter awaiter;
+            UniTask<TKey>.Awaiter awaiter2;
+            Action moveNextAction;
+            TSource enumeratorCurrent;
             TKey prev;
-            bool first;
 
             public _DistinctUntilChangedAwaitWithCancellation(IUniTaskAsyncEnumerable<TSource> source, Func<TSource, CancellationToken, UniTask<TKey>> keySelector, IEqualityComparer<TKey> comparer, CancellationToken cancellationToken)
-
-                : base(source, cancellationToken)
             {
-                this.comparer = comparer;
+                this.source = source;
                 this.keySelector = keySelector;
-                this.first = true;
+                this.comparer = comparer;
+                this.cancellationToken = cancellationToken;
+                this.moveNextAction = MoveNext;
             }
 
-            protected override UniTask<TKey> TransformAsync(TSource sourceCurrent)
+            public TSource Current { get; private set; }
+
+            public UniTask<bool> MoveNextAsync()
             {
-                return keySelector(sourceCurrent, cancellationToken);
+                if (state == -2) return default;
+
+                completionSource.Reset();
+                MoveNext();
+                return new UniTask<bool>(this, completionSource.Version);
             }
 
-            protected override bool TrySetCurrentCore(TKey key, out bool terminateIteration)
+            void MoveNext()
             {
-                if (first || !comparer.Equals(prev, key))
+                REPEAT:
+                try
                 {
-                    first = false;
+                    switch (state)
-                    prev = key;
+                    {
-                    Current = SourceCurrent;
+                        case -1: // init
-                    terminateIteration = false;
+                            enumerator = source.GetAsyncEnumerator(cancellationToken);
-                    return true;
+                            awaiter = enumerator.MoveNextAsync().GetAwaiter();
+                            if (awaiter.IsCompleted)
+                            {
+                                goto case -3;
+                            }
+                            else
+                            {
+                                state = -3;
+                                awaiter.UnsafeOnCompleted(moveNextAction);
+                                return;
+                            }
+                        case -3: // first
+                            if (awaiter.GetResult())
+                            {
+                                Current = enumerator.Current;
+                                goto CONTINUE;
+                            }
+                            else
+                            {
+                                goto DONE;
+                            }
+                        case 0: // normal
+                            awaiter = enumerator.MoveNextAsync().GetAwaiter();
+                            if (awaiter.IsCompleted)
+                            {
+                                goto case 1;
+                            }
+                            else
+                            {
+                                state = 1;
+                                awaiter.UnsafeOnCompleted(moveNextAction);
+                                return;
+                            }
+                        case 1:
+                            if (awaiter.GetResult())
+                            {
+                                enumeratorCurrent = enumerator.Current;
+                                awaiter2 = keySelector(enumeratorCurrent, cancellationToken).GetAwaiter();
+                                if (awaiter2.IsCompleted)
+                                {
+                                    goto case 2;
+                                }
+                                else
+                                {
+                                    state = 2;
+                                    awaiter2.UnsafeOnCompleted(moveNextAction);
+                                    return;
+                                }
+                            }
+                            else
+                            {
+                                goto DONE;
+                            }
+                        case 2:
+                            var key = awaiter2.GetResult();
+                            if (!comparer.Equals(prev, key))
+                            {
+                                prev = key;
+                                Current = enumeratorCurrent;
+                                goto CONTINUE;
+                            }
+                            else
+                            {
+                                state = 0;
+                                goto REPEAT;
+                            }
+                        case -2:
+                        default:
+                            goto DONE;
+                    }
                 }
-                else
+                catch (Exception ex)
                 {
-                    terminateIteration = false;
+                    state = -2;
-                    return false;
+                    completionSource.TrySetException(ex);
+                    return;
                 }
+
+                DONE:
+                state = -2;
+                completionSource.TrySetResult(false);
+                return;
+
+                CONTINUE:
+                state = 0;
+                completionSource.TrySetResult(true);
+                return;
+            }
+
+            public UniTask DisposeAsync()
+            {
+                return enumerator.DisposeAsync();
             }
         }
     }

src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Publish.cs

@@ -115,6 +115,8 @@ namespace Cysharp.Threading.Tasks.Linq
             }
 
             public TSource Current { get; private set; }
+            ITriggerHandler<TSource> ITriggerHandler<TSource>.Prev { get; set; }
+            ITriggerHandler<TSource> ITriggerHandler<TSource>.Next { get; set; }
 
             public UniTask<bool> MoveNextAsync()
             {

src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Select.cs

@@ -71,29 +71,94 @@ namespace Cysharp.Threading.Tasks.Linq
             return new _Select(source, selector, cancellationToken);
         }
 
-        sealed class _Select : AsyncEnumeratorBase<TSource, TResult>
+        sealed class _Select : MoveNextSource, IUniTaskAsyncEnumerator<TResult>
         {
+            readonly IUniTaskAsyncEnumerable<TSource> source;
             readonly Func<TSource, TResult> selector;
+            readonly CancellationToken cancellationToken;
+
+            int state = -1;
+            IUniTaskAsyncEnumerator<TSource> enumerator;
+            UniTask<bool>.Awaiter awaiter;
+            Action moveNextAction;
 
             public _Select(IUniTaskAsyncEnumerable<TSource> source, Func<TSource, TResult> selector, CancellationToken cancellationToken)
-                : base(source, cancellationToken)
             {
+                this.source = source;
                 this.selector = selector;
+                this.cancellationToken = cancellationToken;
+                this.moveNextAction = MoveNext;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
-            protected override bool TryMoveNextCore(bool sourceHasCurrent, out bool result)
+            public TResult Current { get; private set; }
+
+            public UniTask<bool> MoveNextAsync()
             {
-                if (sourceHasCurrent)
+                if (state == -2) return default;
+
+                completionSource.Reset();
+                MoveNext();
+                return new UniTask<bool>(this, completionSource.Version);
+            }
+
+            void MoveNext()
+            {
+                try
                 {
-                    Current = selector(SourceCurrent);
+                    switch (state)
-                    result = true;
+                    {
-                    return true;
+                        case -1: // init
+                            enumerator = source.GetAsyncEnumerator(cancellationToken);
+                            goto case 0;
+                        case 0:
+                            awaiter = enumerator.MoveNextAsync().GetAwaiter();
+                            if (awaiter.IsCompleted)
+                            {
+                                goto case 1;
+                            }
+                            else
+                            {
+                                state = 1;
+                                awaiter.UnsafeOnCompleted(moveNextAction);
+                                return;
+                            }
+                        case 1:
+                            if (awaiter.GetResult())
+                            {
+                                Current = selector(enumerator.Current);
+                                goto CONTINUE;
+                            }
+                            else
+                            {
+                                goto DONE;
+                            }
+                        default:
+                            goto DONE;
+                    }
                 }
-                else
+                catch (Exception ex)
                 {
-                    result = false;
+                    state = -2;
-                    return true;
+                    completionSource.TrySetException(ex);
+                    return;
                 }
+
+                DONE:
+                state = -2;
+                completionSource.TrySetResult(false);
+                return;
+
+                CONTINUE:
+                state = 0;
+                completionSource.TrySetResult(true);
+                return;
+            }
+
+            public UniTask DisposeAsync()
+            {
+                TaskTracker.RemoveTracking(this);
+                return enumerator.DisposeAsync();
             }
         }
     }
@@ -111,33 +176,98 @@ namespace Cysharp.Threading.Tasks.Linq
 
         public IUniTaskAsyncEnumerator<TResult> GetAsyncEnumerator(CancellationToken cancellationToken = default)
         {
-            return new _SelectInt(source, selector, cancellationToken);
+            return new _Select(source, selector, cancellationToken);
         }
 
-        sealed class _SelectInt : AsyncEnumeratorBase<TSource, TResult>
+        sealed class _Select : MoveNextSource, IUniTaskAsyncEnumerator<TResult>
         {
+            readonly IUniTaskAsyncEnumerable<TSource> source;
             readonly Func<TSource, int, TResult> selector;
+            readonly CancellationToken cancellationToken;
+
+            int state = -1;
+            IUniTaskAsyncEnumerator<TSource> enumerator;
+            UniTask<bool>.Awaiter awaiter;
+            Action moveNextAction;
             int index;
 
-            public _SelectInt(IUniTaskAsyncEnumerable<TSource> source, Func<TSource, int, TResult> selector, CancellationToken cancellationToken)
+            public _Select(IUniTaskAsyncEnumerable<TSource> source, Func<TSource, int, TResult> selector, CancellationToken cancellationToken)
-                : base(source, cancellationToken)
             {
+                this.source = source;
                 this.selector = selector;
+                this.cancellationToken = cancellationToken;
+                this.moveNextAction = MoveNext;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
-            protected override bool TryMoveNextCore(bool sourceHasCurrent, out bool result)
+            public TResult Current { get; private set; }
+
+            public UniTask<bool> MoveNextAsync()
             {
-                if (sourceHasCurrent)
+                if (state == -2) return default;
+
+                completionSource.Reset();
+                MoveNext();
+                return new UniTask<bool>(this, completionSource.Version);
+            }
+
+            void MoveNext()
+            {
+                try
                 {
-                    Current = selector(SourceCurrent, checked(index++));
+                    switch (state)
-                    result = true;
+                    {
-                    return true;
+                        case -1: // init
+                            enumerator = source.GetAsyncEnumerator(cancellationToken);
+                            goto case 0;
+                        case 0:
+                            awaiter = enumerator.MoveNextAsync().GetAwaiter();
+                            if (awaiter.IsCompleted)
+                            {
+                                goto case 1;
+                            }
+                            else
+                            {
+                                state = 1;
+                                awaiter.UnsafeOnCompleted(moveNextAction);
+                                return;
+                            }
+                        case 1:
+                            if (awaiter.GetResult())
+                            {
+                                Current = selector(enumerator.Current, checked(index++));
+                                goto CONTINUE;
+                            }
+                            else
+                            {
+                                goto DONE;
+                            }
+                        default:
+                            goto DONE;
+                    }
                 }
-                else
+                catch (Exception ex)
                 {
-                    result = false;
+                    state = -2;
-                    return true;
+                    completionSource.TrySetException(ex);
+                    return;
                 }
+
+                DONE:
+                state = -2;
+                completionSource.TrySetResult(false);
+                return;
+
+                CONTINUE:
+                state = 0;
+                completionSource.TrySetResult(true);
+                return;
+            }
+
+            public UniTask DisposeAsync()
+            {
+                TaskTracker.RemoveTracking(this);
+                return enumerator.DisposeAsync();
             }
         }
     }
@@ -158,26 +288,107 @@ namespace Cysharp.Threading.Tasks.Linq
             return new _SelectAwait(source, selector, cancellationToken);
         }
 
-        sealed class _SelectAwait : AsyncEnumeratorAwaitSelectorBase<TSource, TResult, TResult>
+        sealed class _SelectAwait : MoveNextSource, IUniTaskAsyncEnumerator<TResult>
         {
+            readonly IUniTaskAsyncEnumerable<TSource> source;
             readonly Func<TSource, UniTask<TResult>> selector;
+            readonly CancellationToken cancellationToken;
+
+            int state = -1;
+            IUniTaskAsyncEnumerator<TSource> enumerator;
+            UniTask<bool>.Awaiter awaiter;
+            UniTask<TResult>.Awaiter awaiter2;
+            Action moveNextAction;
 
             public _SelectAwait(IUniTaskAsyncEnumerable<TSource> source, Func<TSource, UniTask<TResult>> selector, CancellationToken cancellationToken)
-                : base(source, cancellationToken)
             {
+                this.source = source;
                 this.selector = selector;
+                this.cancellationToken = cancellationToken;
+                this.moveNextAction = MoveNext;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
-            protected override UniTask<TResult> TransformAsync(TSource sourceCurrent)
+            public TResult Current { get; private set; }
+
+            public UniTask<bool> MoveNextAsync()
             {
-                return selector(sourceCurrent);
+                if (state == -2) return default;
+
+                completionSource.Reset();
+                MoveNext();
+                return new UniTask<bool>(this, completionSource.Version);
             }
 
-            protected override bool TrySetCurrentCore(TResult awaitResult, out bool terminateIteration)
+            void MoveNext()
             {
-                Current = awaitResult;
+                try
-                terminateIteration = false;
+                {
-                return true;
+                    switch (state)
+                    {
+                        case -1: // init
+                            enumerator = source.GetAsyncEnumerator(cancellationToken);
+                            goto case 0;
+                        case 0:
+                            awaiter = enumerator.MoveNextAsync().GetAwaiter();
+                            if (awaiter.IsCompleted)
+                            {
+                                goto case 1;
+                            }
+                            else
+                            {
+                                state = 1;
+                                awaiter.UnsafeOnCompleted(moveNextAction);
+                                return;
+                            }
+                        case 1:
+                            if (awaiter.GetResult())
+                            {
+                                awaiter2 = selector(enumerator.Current).GetAwaiter();
+                                if (awaiter2.IsCompleted)
+                                {
+                                    goto case 2;
+                                }
+                                else
+                                {
+                                    state = 2;
+                                    awaiter2.UnsafeOnCompleted(moveNextAction);
+                                    return;
+                                }
+                            }
+                            else
+                            {
+                                goto DONE;
+                            }
+                        case 2:
+                            Current = awaiter2.GetResult();
+                            goto CONTINUE;
+                        default:
+                            goto DONE;
+                    }
+                }
+                catch (Exception ex)
+                {
+                    state = -2;
+                    completionSource.TrySetException(ex);
+                    return;
+                }
+
+                DONE:
+                state = -2;
+                completionSource.TrySetResult(false);
+                return;
+
+                CONTINUE:
+                state = 0;
+                completionSource.TrySetResult(true);
+                return;
+            }
+
+            public UniTask DisposeAsync()
+            {
+                TaskTracker.RemoveTracking(this);
+                return enumerator.DisposeAsync();
             }
         }
     }
@@ -195,30 +406,111 @@ namespace Cysharp.Threading.Tasks.Linq
 
         public IUniTaskAsyncEnumerator<TResult> GetAsyncEnumerator(CancellationToken cancellationToken = default)
         {
-            return new _SelectIntAwait(source, selector, cancellationToken);
+            return new _SelectAwait(source, selector, cancellationToken);
         }
 
-        sealed class _SelectIntAwait : AsyncEnumeratorAwaitSelectorBase<TSource, TResult, TResult>
+        sealed class _SelectAwait : MoveNextSource, IUniTaskAsyncEnumerator<TResult>
         {
+            readonly IUniTaskAsyncEnumerable<TSource> source;
             readonly Func<TSource, int, UniTask<TResult>> selector;
+            readonly CancellationToken cancellationToken;
+
+            int state = -1;
+            IUniTaskAsyncEnumerator<TSource> enumerator;
+            UniTask<bool>.Awaiter awaiter;
+            UniTask<TResult>.Awaiter awaiter2;
+            Action moveNextAction;
             int index;
 
-            public _SelectIntAwait(IUniTaskAsyncEnumerable<TSource> source, Func<TSource, int, UniTask<TResult>> selector, CancellationToken cancellationToken)
+            public _SelectAwait(IUniTaskAsyncEnumerable<TSource> source, Func<TSource, int, UniTask<TResult>> selector, CancellationToken cancellationToken)
-                : base(source, cancellationToken)
             {
+                this.source = source;
                 this.selector = selector;
+                this.cancellationToken = cancellationToken;
+                this.moveNextAction = MoveNext;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
-            protected override UniTask<TResult> TransformAsync(TSource sourceCurrent)
+            public TResult Current { get; private set; }
+
+            public UniTask<bool> MoveNextAsync()
             {
-                return selector(sourceCurrent, checked(index++));
+                if (state == -2) return default;
+
+                completionSource.Reset();
+                MoveNext();
+                return new UniTask<bool>(this, completionSource.Version);
             }
 
-            protected override bool TrySetCurrentCore(TResult awaitResult, out bool terminateIteration)
+            void MoveNext()
             {
-                Current = awaitResult;
+                try
-                terminateIteration = false;
+                {
-                return true;
+                    switch (state)
+                    {
+                        case -1: // init
+                            enumerator = source.GetAsyncEnumerator(cancellationToken);
+                            goto case 0;
+                        case 0:
+                            awaiter = enumerator.MoveNextAsync().GetAwaiter();
+                            if (awaiter.IsCompleted)
+                            {
+                                goto case 1;
+                            }
+                            else
+                            {
+                                state = 1;
+                                awaiter.UnsafeOnCompleted(moveNextAction);
+                                return;
+                            }
+                        case 1:
+                            if (awaiter.GetResult())
+                            {
+                                awaiter2 = selector(enumerator.Current, checked(index++)).GetAwaiter();
+                                if (awaiter2.IsCompleted)
+                                {
+                                    goto case 2;
+                                }
+                                else
+                                {
+                                    state = 2;
+                                    awaiter2.UnsafeOnCompleted(moveNextAction);
+                                    return;
+                                }
+                            }
+                            else
+                            {
+                                goto DONE;
+                            }
+                        case 2:
+                            Current = awaiter2.GetResult();
+                            goto CONTINUE;
+                        default:
+                            goto DONE;
+                    }
+                }
+                catch (Exception ex)
+                {
+                    state = -2;
+                    completionSource.TrySetException(ex);
+                    return;
+                }
+
+                DONE:
+                state = -2;
+                completionSource.TrySetResult(false);
+                return;
+
+                CONTINUE:
+                state = 0;
+                completionSource.TrySetResult(true);
+                return;
+            }
+
+            public UniTask DisposeAsync()
+            {
+                TaskTracker.RemoveTracking(this);
+                return enumerator.DisposeAsync();
             }
         }
     }
@@ -239,26 +531,107 @@ namespace Cysharp.Threading.Tasks.Linq
             return new _SelectAwaitWithCancellation(source, selector, cancellationToken);
         }
 
-        sealed class _SelectAwaitWithCancellation : AsyncEnumeratorAwaitSelectorBase<TSource, TResult, TResult>
+        sealed class _SelectAwaitWithCancellation : MoveNextSource, IUniTaskAsyncEnumerator<TResult>
         {
+            readonly IUniTaskAsyncEnumerable<TSource> source;
             readonly Func<TSource, CancellationToken, UniTask<TResult>> selector;
+            readonly CancellationToken cancellationToken;
+
+            int state = -1;
+            IUniTaskAsyncEnumerator<TSource> enumerator;
+            UniTask<bool>.Awaiter awaiter;
+            UniTask<TResult>.Awaiter awaiter2;
+            Action moveNextAction;
 
             public _SelectAwaitWithCancellation(IUniTaskAsyncEnumerable<TSource> source, Func<TSource, CancellationToken, UniTask<TResult>> selector, CancellationToken cancellationToken)
-                : base(source, cancellationToken)
             {
+                this.source = source;
                 this.selector = selector;
+                this.cancellationToken = cancellationToken;
+                this.moveNextAction = MoveNext;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
-            protected override UniTask<TResult> TransformAsync(TSource sourceCurrent)
+            public TResult Current { get; private set; }
+
+            public UniTask<bool> MoveNextAsync()
             {
-                return selector(sourceCurrent, cancellationToken);
+                if (state == -2) return default;
+
+                completionSource.Reset();
+                MoveNext();
+                return new UniTask<bool>(this, completionSource.Version);
             }
 
-            protected override bool TrySetCurrentCore(TResult awaitResult, out bool terminateIteration)
+            void MoveNext()
             {
-                Current = awaitResult;
+                try
-                terminateIteration = false;
+                {
-                return true;
+                    switch (state)
+                    {
+                        case -1: // init
+                            enumerator = source.GetAsyncEnumerator(cancellationToken);
+                            goto case 0;
+                        case 0:
+                            awaiter = enumerator.MoveNextAsync().GetAwaiter();
+                            if (awaiter.IsCompleted)
+                            {
+                                goto case 1;
+                            }
+                            else
+                            {
+                                state = 1;
+                                awaiter.UnsafeOnCompleted(moveNextAction);
+                                return;
+                            }
+                        case 1:
+                            if (awaiter.GetResult())
+                            {
+                                awaiter2 = selector(enumerator.Current, cancellationToken).GetAwaiter();
+                                if (awaiter2.IsCompleted)
+                                {
+                                    goto case 2;
+                                }
+                                else
+                                {
+                                    state = 2;
+                                    awaiter2.UnsafeOnCompleted(moveNextAction);
+                                    return;
+                                }
+                            }
+                            else
+                            {
+                                goto DONE;
+                            }
+                        case 2:
+                            Current = awaiter2.GetResult();
+                            goto CONTINUE;
+                        default:
+                            goto DONE;
+                    }
+                }
+                catch (Exception ex)
+                {
+                    state = -2;
+                    completionSource.TrySetException(ex);
+                    return;
+                }
+
+                DONE:
+                state = -2;
+                completionSource.TrySetResult(false);
+                return;
+
+                CONTINUE:
+                state = 0;
+                completionSource.TrySetResult(true);
+                return;
+            }
+
+            public UniTask DisposeAsync()
+            {
+                TaskTracker.RemoveTracking(this);
+                return enumerator.DisposeAsync();
             }
         }
     }
@@ -276,32 +649,112 @@ namespace Cysharp.Threading.Tasks.Linq
 
         public IUniTaskAsyncEnumerator<TResult> GetAsyncEnumerator(CancellationToken cancellationToken = default)
         {
-            return new _SelectIntAwaitWithCancellation(source, selector, cancellationToken);
+            return new _SelectAwaitWithCancellation(source, selector, cancellationToken);
         }
 
-        sealed class _SelectIntAwaitWithCancellation : AsyncEnumeratorAwaitSelectorBase<TSource, TResult, TResult>
+        sealed class _SelectAwaitWithCancellation : MoveNextSource, IUniTaskAsyncEnumerator<TResult>
         {
+            readonly IUniTaskAsyncEnumerable<TSource> source;
             readonly Func<TSource, int, CancellationToken, UniTask<TResult>> selector;
+            readonly CancellationToken cancellationToken;
+
+            int state = -1;
+            IUniTaskAsyncEnumerator<TSource> enumerator;
+            UniTask<bool>.Awaiter awaiter;
+            UniTask<TResult>.Awaiter awaiter2;
+            Action moveNextAction;
             int index;
 
-            public _SelectIntAwaitWithCancellation(IUniTaskAsyncEnumerable<TSource> source, Func<TSource, int, CancellationToken, UniTask<TResult>> selector, CancellationToken cancellationToken)
+            public _SelectAwaitWithCancellation(IUniTaskAsyncEnumerable<TSource> source, Func<TSource, int, CancellationToken, UniTask<TResult>> selector, CancellationToken cancellationToken)
-                : base(source, cancellationToken)
             {
+                this.source = source;
                 this.selector = selector;
+                this.cancellationToken = cancellationToken;
+                this.moveNextAction = MoveNext;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
-            protected override UniTask<TResult> TransformAsync(TSource sourceCurrent)
+            public TResult Current { get; private set; }
+
+            public UniTask<bool> MoveNextAsync()
             {
-                return selector(sourceCurrent, checked(index++), cancellationToken);
+                if (state == -2) return default;
+
+                completionSource.Reset();
+                MoveNext();
+                return new UniTask<bool>(this, completionSource.Version);
             }
 
-            protected override bool TrySetCurrentCore(TResult awaitResult, out bool terminateIteration)
+            void MoveNext()
             {
-                Current = awaitResult;
+                try
-                terminateIteration = false;
+                {
-                return true;
+                    switch (state)
+                    {
+                        case -1: // init
+                            enumerator = source.GetAsyncEnumerator(cancellationToken);
+                            goto case 0;
+                        case 0:
+                            awaiter = enumerator.MoveNextAsync().GetAwaiter();
+                            if (awaiter.IsCompleted)
+                            {
+                                goto case 1;
+                            }
+                            else
+                            {
+                                state = 1;
+                                awaiter.UnsafeOnCompleted(moveNextAction);
+                                return;
+                            }
+                        case 1:
+                            if (awaiter.GetResult())
+                            {
+                                awaiter2 = selector(enumerator.Current, checked(index++), cancellationToken).GetAwaiter();
+                                if (awaiter2.IsCompleted)
+                                {
+                                    goto case 2;
+                                }
+                                else
+                                {
+                                    state = 2;
+                                    awaiter2.UnsafeOnCompleted(moveNextAction);
+                                    return;
+                                }
+                            }
+                            else
+                            {
+                                goto DONE;
+                            }
+                        case 2:
+                            Current = awaiter2.GetResult();
+                            goto CONTINUE;
+                        default:
+                            goto DONE;
+                    }
+                }
+                catch (Exception ex)
+                {
+                    state = -2;
+                    completionSource.TrySetException(ex);
+                    return;
+                }
+
+                DONE:
+                state = -2;
+                completionSource.TrySetResult(false);
+                return;
+
+                CONTINUE:
+                state = 0;
+                completionSource.TrySetResult(true);
+                return;
+            }
+
+            public UniTask DisposeAsync()
+            {
+                TaskTracker.RemoveTracking(this);
+                return enumerator.DisposeAsync();
             }
         }
     }
-
 }

src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/SkipUntil.cs

@@ -0,0 +1,187 @@
+using Cysharp.Threading.Tasks.Internal;
+using System;
+using System.Threading;
+
+namespace Cysharp.Threading.Tasks.Linq
+{
+    public static partial class UniTaskAsyncEnumerable
+    {
+        public static IUniTaskAsyncEnumerable<TSource> SkipUntil<TSource>(this IUniTaskAsyncEnumerable<TSource> source, UniTask other)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+
+            return new SkipUntil<TSource>(source, other, null);
+        }
+
+        public static IUniTaskAsyncEnumerable<TSource> SkipUntil<TSource>(this IUniTaskAsyncEnumerable<TSource> source, Func<CancellationToken, UniTask> other)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+            Error.ThrowArgumentNullException(source, nameof(other));
+
+            return new SkipUntil<TSource>(source, default, other);
+        }
+    }
+
+    internal sealed class SkipUntil<TSource> : IUniTaskAsyncEnumerable<TSource>
+    {
+        readonly IUniTaskAsyncEnumerable<TSource> source;
+        readonly UniTask other;
+        readonly Func<CancellationToken, UniTask> other2;
+
+        public SkipUntil(IUniTaskAsyncEnumerable<TSource> source, UniTask other, Func<CancellationToken, UniTask> other2)
+        {
+            this.source = source;
+            this.other = other;
+            this.other2 = other2;
+        }
+
+        public IUniTaskAsyncEnumerator<TSource> GetAsyncEnumerator(CancellationToken cancellationToken = default)
+        {
+            if (other2 != null)
+            {
+                return new _SkipUntil(source, this.other2(cancellationToken), cancellationToken);
+            }
+            else
+            {
+                return new _SkipUntil(source, this.other, cancellationToken);
+            }
+        }
+
+        sealed class _SkipUntil : MoveNextSource, IUniTaskAsyncEnumerator<TSource>
+        {
+            static readonly Action<object> CancelDelegate1 = OnCanceled1;
+            static readonly Action<object> MoveNextCoreDelegate = MoveNextCore;
+
+            readonly IUniTaskAsyncEnumerable<TSource> source;
+            CancellationToken cancellationToken1;
+
+            bool completed;
+            CancellationTokenRegistration cancellationTokenRegistration1;
+            IUniTaskAsyncEnumerator<TSource> enumerator;
+            UniTask<bool>.Awaiter awaiter;
+            bool continueNext;
+            Exception exception;
+
+            public _SkipUntil(IUniTaskAsyncEnumerable<TSource> source, UniTask other, CancellationToken cancellationToken1)
+            {
+                this.source = source;
+                this.cancellationToken1 = cancellationToken1;
+                if (cancellationToken1.CanBeCanceled)
+                {
+                    this.cancellationTokenRegistration1 = cancellationToken1.RegisterWithoutCaptureExecutionContext(CancelDelegate1, this);
+                }
+
+                TaskTracker.TrackActiveTask(this, 3);
+                RunOther(other).Forget();
+            }
+
+            public TSource Current { get; private set; }
+
+            public UniTask<bool> MoveNextAsync()
+            {
+                if (exception != null)
+                {
+                    return UniTask.FromException<bool>(exception);
+                }
+
+                if (cancellationToken1.IsCancellationRequested)
+                {
+                    return UniTask.FromCanceled<bool>(cancellationToken1);
+                }
+
+                if (enumerator == null)
+                {
+                    enumerator = source.GetAsyncEnumerator(cancellationToken1);
+                }
+                completionSource.Reset();
+
+                if (completed)
+                {
+                    SourceMoveNext();
+                }
+                return new UniTask<bool>(this, completionSource.Version);
+            }
+
+            void SourceMoveNext()
+            {
+                try
+                {
+                    LOOP:
+                    awaiter = enumerator.MoveNextAsync().GetAwaiter();
+                    if (awaiter.IsCompleted)
+                    {
+                        continueNext = true;
+                        MoveNextCore(this);
+                        if (continueNext)
+                        {
+                            continueNext = false;
+                            goto LOOP;
+                        }
+                    }
+                    else
+                    {
+                        awaiter.SourceOnCompleted(MoveNextCoreDelegate, this);
+                    }
+                }
+                catch (Exception ex)
+                {
+                    completionSource.TrySetException(ex);
+                }
+            }
+
+            static void MoveNextCore(object state)
+            {
+                var self = (_SkipUntil)state;
+
+                if (self.TryGetResult(self.awaiter, out var result))
+                {
+                    if (result)
+                    {
+                        self.Current = self.enumerator.Current;
+                        self.completionSource.TrySetResult(true);
+                        if (self.continueNext)
+                        {
+                            self.SourceMoveNext();
+                        }
+                    }
+                    else
+                    {
+                        self.completionSource.TrySetResult(false);
+                    }
+                }
+            }
+
+            async UniTaskVoid RunOther(UniTask other)
+            {
+                try
+                {
+                    await other;
+                    completed = true;
+                    SourceMoveNext();
+                }
+                catch (Exception ex)
+                {
+                    exception = ex;
+                    completionSource.TrySetException(ex);
+                }
+            }
+
+            static void OnCanceled1(object state)
+            {
+                var self = (_SkipUntil)state;
+                self.completionSource.TrySetCanceled(self.cancellationToken1);
+            }
+
+            public UniTask DisposeAsync()
+            {
+                TaskTracker.RemoveTracking(this);
+                cancellationTokenRegistration1.Dispose();
+                if (enumerator != null)
+                {
+                    return enumerator.DisposeAsync();
+                }
+                return default;
+            }
+        }
+    }
+}

src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/SkipUntil.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: de932d79c8d9f3841a066d05ff29edc9
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/SkipUntilCanceled.cs

@@ -32,13 +32,17 @@ namespace Cysharp.Threading.Tasks.Linq
 
         sealed class _SkipUntilCanceled : MoveNextSource, IUniTaskAsyncEnumerator<TSource>
         {
+            static readonly Action<object> CancelDelegate1 = OnCanceled1;
+            static readonly Action<object> CancelDelegate2 = OnCanceled2;
             static readonly Action<object> MoveNextCoreDelegate = MoveNextCore;
 
             readonly IUniTaskAsyncEnumerable<TSource> source;
             CancellationToken cancellationToken1;
             CancellationToken cancellationToken2;
+            CancellationTokenRegistration cancellationTokenRegistration1;
+            CancellationTokenRegistration cancellationTokenRegistration2;
 
-            bool isCanceled;
+            int isCanceled;
             IUniTaskAsyncEnumerator<TSource> enumerator;
             UniTask<bool>.Awaiter awaiter;
             bool continueNext;
@@ -48,6 +52,14 @@ namespace Cysharp.Threading.Tasks.Linq
                 this.source = source;
                 this.cancellationToken1 = cancellationToken1;
                 this.cancellationToken2 = cancellationToken2;
+                if (cancellationToken1.CanBeCanceled)
+                {
+                    this.cancellationTokenRegistration1 = cancellationToken1.RegisterWithoutCaptureExecutionContext(CancelDelegate1, this);
+                }
+                if (cancellationToken1 != cancellationToken2 && cancellationToken2.CanBeCanceled)
+                {
+                    this.cancellationTokenRegistration2 = cancellationToken2.RegisterWithoutCaptureExecutionContext(CancelDelegate2, this);
+                }
                 TaskTracker.TrackActiveTask(this, 3);
             }
 
@@ -55,15 +67,18 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public UniTask<bool> MoveNextAsync()
             {
-                if (cancellationToken1.IsCancellationRequested) isCanceled = true;
-                if (cancellationToken2.IsCancellationRequested) isCanceled = true;
-
                 if (enumerator == null)
                 {
+                    if (cancellationToken1.IsCancellationRequested) isCanceled = 1;
+                    if (cancellationToken2.IsCancellationRequested) isCanceled = 1;
                     enumerator = source.GetAsyncEnumerator(cancellationToken2); // use only AsyncEnumerator provided token.
                 }
                 completionSource.Reset();
-                SourceMoveNext();
+
+                if (isCanceled != 0)
+                {
+                    SourceMoveNext();
+                }
                 return new UniTask<bool>(this, completionSource.Version);
             }
 
@@ -102,25 +117,11 @@ namespace Cysharp.Threading.Tasks.Linq
                 {
                     if (result)
                     {
-                        AGAIN:
+                        self.Current = self.enumerator.Current;
-
+                        self.completionSource.TrySetResult(true);
-                        if (self.isCanceled)
+                        if (self.continueNext)
                         {
-                            self.continueNext = false;
+                            self.SourceMoveNext();
-                            self.Current = self.enumerator.Current;
-                            self.completionSource.TrySetResult(true);
-                        }
-                        else
-                        {
-                            if (self.cancellationToken1.IsCancellationRequested) self.isCanceled = true;
-                            if (self.cancellationToken2.IsCancellationRequested) self.isCanceled = true;
-
-                            if (self.isCanceled) goto AGAIN;
-
-                            if (!self.continueNext)
-                            {
-                                self.SourceMoveNext();
-                            }
                         }
                     }
                     else
@@ -130,9 +131,37 @@ namespace Cysharp.Threading.Tasks.Linq
                 }
             }
 
+            static void OnCanceled1(object state)
+            {
+                var self = (_SkipUntilCanceled)state;
+                if (self.isCanceled == 0)
+                {
+                    if (Interlocked.Increment(ref self.isCanceled) == 1)
+                    {
+                        self.cancellationTokenRegistration2.Dispose();
+                        self.SourceMoveNext();
+                    }
+                }
+            }
+
+            static void OnCanceled2(object state)
+            {
+                var self = (_SkipUntilCanceled)state;
+                if (self.isCanceled == 0)
+                {
+                    if (Interlocked.Increment(ref self.isCanceled) == 1)
+                    {
+                        self.cancellationTokenRegistration2.Dispose();
+                        self.SourceMoveNext();
+                    }
+                }
+            }
+
             public UniTask DisposeAsync()
             {
                 TaskTracker.RemoveTracking(this);
+                cancellationTokenRegistration1.Dispose();
+                cancellationTokenRegistration2.Dispose();
                 if (enumerator != null)
                 {
                     return enumerator.DisposeAsync();

src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Subscribe.cs

@@ -0,0 +1,536 @@
+using Cysharp.Threading.Tasks.Internal;
+using System;
+using System.Threading;
+using Subscribes = Cysharp.Threading.Tasks.Linq.Subscribe;
+
+namespace Cysharp.Threading.Tasks.Linq
+{
+    public static partial class UniTaskAsyncEnumerable
+    {
+        // OnNext
+
+        public static IDisposable Subscribe<TSource>(this IUniTaskAsyncEnumerable<TSource> source, Action<TSource> action)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+            Error.ThrowArgumentNullException(action, nameof(action));
+
+            var cts = new CancellationTokenDisposable();
+            Subscribes.SubscribeCore(source, action, Subscribes.NopError, Subscribes.NopCompleted, cts.Token).Forget();
+            return cts;
+        }
+
+        public static IDisposable Subscribe<TSource>(this IUniTaskAsyncEnumerable<TSource> source, Func<TSource, UniTaskVoid> action)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+            Error.ThrowArgumentNullException(action, nameof(action));
+
+            var cts = new CancellationTokenDisposable();
+            Subscribes.SubscribeCore(source, action, Subscribes.NopError, Subscribes.NopCompleted, cts.Token).Forget();
+            return cts;
+        }
+
+        public static IDisposable Subscribe<TSource>(this IUniTaskAsyncEnumerable<TSource> source, Func<TSource, CancellationToken, UniTaskVoid> action)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+            Error.ThrowArgumentNullException(action, nameof(action));
+
+            var cts = new CancellationTokenDisposable();
+            Subscribes.SubscribeCore(source, action, Subscribes.NopError, Subscribes.NopCompleted, cts.Token).Forget();
+            return cts;
+        }
+
+        public static void Subscribe<TSource>(this IUniTaskAsyncEnumerable<TSource> source, Action<TSource> action, CancellationToken cancellationToken)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+            Error.ThrowArgumentNullException(action, nameof(action));
+
+            Subscribes.SubscribeCore(source, action, Subscribes.NopError, Subscribes.NopCompleted, cancellationToken).Forget();
+        }
+
+        public static void Subscribe<TSource>(this IUniTaskAsyncEnumerable<TSource> source, Func<TSource, UniTaskVoid> action, CancellationToken cancellationToken)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+            Error.ThrowArgumentNullException(action, nameof(action));
+
+            Subscribes.SubscribeCore(source, action, Subscribes.NopError, Subscribes.NopCompleted, cancellationToken).Forget();
+        }
+
+        public static void Subscribe<TSource>(this IUniTaskAsyncEnumerable<TSource> source, Func<TSource, CancellationToken, UniTaskVoid> action, CancellationToken cancellationToken)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+            Error.ThrowArgumentNullException(action, nameof(action));
+
+            Subscribes.SubscribeCore(source, action, Subscribes.NopError, Subscribes.NopCompleted, cancellationToken).Forget();
+        }
+
+        public static IDisposable SubscribeAwait<TSource>(this IUniTaskAsyncEnumerable<TSource> source, Func<TSource, UniTask> onNext)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+            Error.ThrowArgumentNullException(onNext, nameof(onNext));
+
+            var cts = new CancellationTokenDisposable();
+            Subscribes.SubscribeAwaitCore(source, onNext, Subscribes.NopError, Subscribes.NopCompleted, cts.Token).Forget();
+            return cts;
+        }
+
+        public static void SubscribeAwait<TSource>(this IUniTaskAsyncEnumerable<TSource> source, Func<TSource, UniTask> onNext, CancellationToken cancellationToken)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+            Error.ThrowArgumentNullException(onNext, nameof(onNext));
+
+            Subscribes.SubscribeAwaitCore(source, onNext, Subscribes.NopError, Subscribes.NopCompleted, cancellationToken).Forget();
+        }
+
+        public static IDisposable SubscribeAwait<TSource>(this IUniTaskAsyncEnumerable<TSource> source, Func<TSource, CancellationToken, UniTask> onNext)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+            Error.ThrowArgumentNullException(onNext, nameof(onNext));
+
+            var cts = new CancellationTokenDisposable();
+            Subscribes.SubscribeAwaitCore(source, onNext, Subscribes.NopError, Subscribes.NopCompleted, cts.Token).Forget();
+            return cts;
+        }
+
+        public static void SubscribeAwait<TSource>(this IUniTaskAsyncEnumerable<TSource> source, Func<TSource, CancellationToken, UniTask> onNext, CancellationToken cancellationToken)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+            Error.ThrowArgumentNullException(onNext, nameof(onNext));
+
+            Subscribes.SubscribeAwaitCore(source, onNext, Subscribes.NopError, Subscribes.NopCompleted, cancellationToken).Forget();
+        }
+
+        // OnNext, OnError
+
+        public static IDisposable Subscribe<TSource>(this IUniTaskAsyncEnumerable<TSource> source, Action<TSource> onNext, Action<Exception> onError)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+            Error.ThrowArgumentNullException(onNext, nameof(onNext));
+            Error.ThrowArgumentNullException(onError, nameof(onError));
+
+            var cts = new CancellationTokenDisposable();
+            Subscribes.SubscribeCore(source, onNext, onError, Subscribes.NopCompleted, cts.Token).Forget();
+            return cts;
+        }
+
+        public static IDisposable Subscribe<TSource>(this IUniTaskAsyncEnumerable<TSource> source, Func<TSource, UniTaskVoid> onNext, Action<Exception> onError)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+            Error.ThrowArgumentNullException(onNext, nameof(onNext));
+            Error.ThrowArgumentNullException(onError, nameof(onError));
+
+            var cts = new CancellationTokenDisposable();
+            Subscribes.SubscribeCore(source, onNext, onError, Subscribes.NopCompleted, cts.Token).Forget();
+            return cts;
+        }
+
+        public static void Subscribe<TSource>(this IUniTaskAsyncEnumerable<TSource> source, Action<TSource> onNext, Action<Exception> onError, CancellationToken cancellationToken)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+            Error.ThrowArgumentNullException(onNext, nameof(onNext));
+            Error.ThrowArgumentNullException(onError, nameof(onError));
+
+            Subscribes.SubscribeCore(source, onNext, onError, Subscribes.NopCompleted, cancellationToken).Forget();
+        }
+
+        public static void Subscribe<TSource>(this IUniTaskAsyncEnumerable<TSource> source, Func<TSource, UniTaskVoid> onNext, Action<Exception> onError, CancellationToken cancellationToken)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+            Error.ThrowArgumentNullException(onNext, nameof(onNext));
+            Error.ThrowArgumentNullException(onError, nameof(onError));
+
+            Subscribes.SubscribeCore(source, onNext, onError, Subscribes.NopCompleted, cancellationToken).Forget();
+        }
+
+        public static IDisposable SubscribeAwait<TSource>(this IUniTaskAsyncEnumerable<TSource> source, Func<TSource, UniTask> onNext, Action<Exception> onError)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+            Error.ThrowArgumentNullException(onNext, nameof(onNext));
+            Error.ThrowArgumentNullException(onError, nameof(onError));
+
+            var cts = new CancellationTokenDisposable();
+            Subscribes.SubscribeAwaitCore(source, onNext, onError, Subscribes.NopCompleted, cts.Token).Forget();
+            return cts;
+        }
+
+        public static void SubscribeAwait<TSource>(this IUniTaskAsyncEnumerable<TSource> source, Func<TSource, UniTask> onNext, Action<Exception> onError, CancellationToken cancellationToken)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+            Error.ThrowArgumentNullException(onNext, nameof(onNext));
+            Error.ThrowArgumentNullException(onError, nameof(onError));
+
+            Subscribes.SubscribeAwaitCore(source, onNext, onError, Subscribes.NopCompleted, cancellationToken).Forget();
+        }
+
+        public static IDisposable SubscribeAwait<TSource>(this IUniTaskAsyncEnumerable<TSource> source, Func<TSource, CancellationToken, UniTask> onNext, Action<Exception> onError)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+            Error.ThrowArgumentNullException(onNext, nameof(onNext));
+            Error.ThrowArgumentNullException(onError, nameof(onError));
+
+            var cts = new CancellationTokenDisposable();
+            Subscribes.SubscribeAwaitCore(source, onNext, onError, Subscribes.NopCompleted, cts.Token).Forget();
+            return cts;
+        }
+
+        public static void SubscribeAwait<TSource>(this IUniTaskAsyncEnumerable<TSource> source, Func<TSource, CancellationToken, UniTask> onNext, Action<Exception> onError, CancellationToken cancellationToken)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+            Error.ThrowArgumentNullException(onNext, nameof(onNext));
+            Error.ThrowArgumentNullException(onError, nameof(onError));
+
+            Subscribes.SubscribeAwaitCore(source, onNext, onError, Subscribes.NopCompleted, cancellationToken).Forget();
+        }
+
+        // OnNext, OnCompleted
+
+        public static IDisposable Subscribe<TSource>(this IUniTaskAsyncEnumerable<TSource> source, Action<TSource> onNext, Action onCompleted)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+            Error.ThrowArgumentNullException(onNext, nameof(onNext));
+            Error.ThrowArgumentNullException(onCompleted, nameof(onCompleted));
+
+            var cts = new CancellationTokenDisposable();
+            Subscribes.SubscribeCore(source, onNext, Subscribes.NopError, onCompleted, cts.Token).Forget();
+            return cts;
+        }
+
+        public static IDisposable Subscribe<TSource>(this IUniTaskAsyncEnumerable<TSource> source, Func<TSource, UniTaskVoid> onNext, Action onCompleted)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+            Error.ThrowArgumentNullException(onNext, nameof(onNext));
+            Error.ThrowArgumentNullException(onCompleted, nameof(onCompleted));
+
+            var cts = new CancellationTokenDisposable();
+            Subscribes.SubscribeCore(source, onNext, Subscribes.NopError, onCompleted, cts.Token).Forget();
+            return cts;
+        }
+
+        public static void Subscribe<TSource>(this IUniTaskAsyncEnumerable<TSource> source, Action<TSource> onNext, Action onCompleted, CancellationToken cancellationToken)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+            Error.ThrowArgumentNullException(onNext, nameof(onNext));
+            Error.ThrowArgumentNullException(onCompleted, nameof(onCompleted));
+
+            Subscribes.SubscribeCore(source, onNext, Subscribes.NopError, onCompleted, cancellationToken).Forget();
+        }
+
+        public static void Subscribe<TSource>(this IUniTaskAsyncEnumerable<TSource> source, Func<TSource, UniTaskVoid> onNext, Action onCompleted, CancellationToken cancellationToken)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+            Error.ThrowArgumentNullException(onNext, nameof(onNext));
+            Error.ThrowArgumentNullException(onCompleted, nameof(onCompleted));
+
+            Subscribes.SubscribeCore(source, onNext, Subscribes.NopError, onCompleted, cancellationToken).Forget();
+        }
+
+        public static IDisposable SubscribeAwait<TSource>(this IUniTaskAsyncEnumerable<TSource> source, Func<TSource, UniTask> onNext, Action onCompleted)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+            Error.ThrowArgumentNullException(onNext, nameof(onNext));
+            Error.ThrowArgumentNullException(onCompleted, nameof(onCompleted));
+
+            var cts = new CancellationTokenDisposable();
+            Subscribes.SubscribeAwaitCore(source, onNext, Subscribes.NopError, onCompleted, cts.Token).Forget();
+            return cts;
+        }
+
+        public static void SubscribeAwait<TSource>(this IUniTaskAsyncEnumerable<TSource> source, Func<TSource, UniTask> onNext, Action onCompleted, CancellationToken cancellationToken)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+            Error.ThrowArgumentNullException(onNext, nameof(onNext));
+            Error.ThrowArgumentNullException(onCompleted, nameof(onCompleted));
+
+            Subscribes.SubscribeAwaitCore(source, onNext, Subscribes.NopError, onCompleted, cancellationToken).Forget();
+        }
+
+        public static IDisposable SubscribeAwait<TSource>(this IUniTaskAsyncEnumerable<TSource> source, Func<TSource, CancellationToken, UniTask> onNext, Action onCompleted)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+            Error.ThrowArgumentNullException(onNext, nameof(onNext));
+            Error.ThrowArgumentNullException(onCompleted, nameof(onCompleted));
+
+            var cts = new CancellationTokenDisposable();
+            Subscribes.SubscribeAwaitCore(source, onNext, Subscribes.NopError, onCompleted, cts.Token).Forget();
+            return cts;
+        }
+
+        public static void SubscribeAwait<TSource>(this IUniTaskAsyncEnumerable<TSource> source, Func<TSource, CancellationToken, UniTask> onNext, Action onCompleted, CancellationToken cancellationToken)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+            Error.ThrowArgumentNullException(onNext, nameof(onNext));
+            Error.ThrowArgumentNullException(onCompleted, nameof(onCompleted));
+
+            Subscribes.SubscribeAwaitCore(source, onNext, Subscribes.NopError, onCompleted, cancellationToken).Forget();
+        }
+
+        // IObserver
+
+        public static IDisposable Subscribe<TSource>(this IUniTaskAsyncEnumerable<TSource> source, IObserver<TSource> observer)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+            Error.ThrowArgumentNullException(observer, nameof(observer));
+
+            var cts = new CancellationTokenDisposable();
+            Subscribes.SubscribeCore(source, observer, cts.Token).Forget();
+            return cts;
+        }
+
+        public static void Subscribe<TSource>(this IUniTaskAsyncEnumerable<TSource> source, IObserver<TSource> observer, CancellationToken cancellationToken)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+            Error.ThrowArgumentNullException(observer, nameof(observer));
+
+            Subscribes.SubscribeCore(source, observer, cancellationToken).Forget();
+        }
+    }
+
+    internal sealed class CancellationTokenDisposable : IDisposable
+    {
+        readonly CancellationTokenSource cts = new CancellationTokenSource();
+
+        public CancellationToken Token => cts.Token;
+
+        public void Dispose()
+        {
+            if (!cts.IsCancellationRequested)
+            {
+                cts.Cancel();
+            }
+        }
+    }
+
+    internal static class Subscribe
+    {
+        public static readonly Action<Exception> NopError = _ => { };
+        public static readonly Action NopCompleted = () => { };
+
+        public static async UniTaskVoid SubscribeCore<TSource>(IUniTaskAsyncEnumerable<TSource> source, Action<TSource> onNext, Action<Exception> onError, Action onCompleted, CancellationToken cancellationToken)
+        {
+            var e = source.GetAsyncEnumerator(cancellationToken);
+            try
+            {
+                while (await e.MoveNextAsync())
+                {
+                    try
+                    {
+                        onNext(e.Current);
+                    }
+                    catch (Exception ex)
+                    {
+                        UniTaskScheduler.PublishUnobservedTaskException(ex);
+                    }
+                }
+                onCompleted();
+            }
+            catch (Exception ex)
+            {
+                if (onError == NopError)
+                {
+                    UniTaskScheduler.PublishUnobservedTaskException(ex);
+                    return;
+                }
+
+                if (ex is OperationCanceledException) return;
+
+                onError(ex);
+            }
+            finally
+            {
+                if (e != null)
+                {
+                    await e.DisposeAsync();
+                }
+            }
+        }
+
+        public static async UniTaskVoid SubscribeCore<TSource>(IUniTaskAsyncEnumerable<TSource> source, Func<TSource, UniTaskVoid> onNext, Action<Exception> onError, Action onCompleted, CancellationToken cancellationToken)
+        {
+            var e = source.GetAsyncEnumerator(cancellationToken);
+            try
+            {
+                while (await e.MoveNextAsync())
+                {
+                    try
+                    {
+                        onNext(e.Current).Forget();
+                    }
+                    catch (Exception ex)
+                    {
+                        UniTaskScheduler.PublishUnobservedTaskException(ex);
+                    }
+                }
+                onCompleted();
+            }
+            catch (Exception ex)
+            {
+                if (onError == NopError)
+                {
+                    UniTaskScheduler.PublishUnobservedTaskException(ex);
+                    return;
+                }
+
+                if (ex is OperationCanceledException) return;
+
+                onError(ex);
+            }
+            finally
+            {
+                if (e != null)
+                {
+                    await e.DisposeAsync();
+                }
+            }
+        }
+
+        public static async UniTaskVoid SubscribeCore<TSource>(IUniTaskAsyncEnumerable<TSource> source, Func<TSource, CancellationToken, UniTaskVoid> onNext, Action<Exception> onError, Action onCompleted, CancellationToken cancellationToken)
+        {
+            var e = source.GetAsyncEnumerator(cancellationToken);
+            try
+            {
+                while (await e.MoveNextAsync())
+                {
+                    try
+                    {
+                        onNext(e.Current, cancellationToken).Forget();
+                    }
+                    catch (Exception ex)
+                    {
+                        UniTaskScheduler.PublishUnobservedTaskException(ex);
+                    }
+                }
+                onCompleted();
+            }
+            catch (Exception ex)
+            {
+                if (onError == NopError)
+                {
+                    UniTaskScheduler.PublishUnobservedTaskException(ex);
+                    return;
+                }
+
+                if (ex is OperationCanceledException) return;
+
+                onError(ex);
+            }
+            finally
+            {
+                if (e != null)
+                {
+                    await e.DisposeAsync();
+                }
+            }
+        }
+
+        public static async UniTaskVoid SubscribeCore<TSource>(IUniTaskAsyncEnumerable<TSource> source, IObserver<TSource> observer, CancellationToken cancellationToken)
+        {
+            var e = source.GetAsyncEnumerator(cancellationToken);
+            try
+            {
+                while (await e.MoveNextAsync())
+                {
+                    try
+                    {
+                        observer.OnNext(e.Current);
+                    }
+                    catch (Exception ex)
+                    {
+                        UniTaskScheduler.PublishUnobservedTaskException(ex);
+                    }
+                }
+                observer.OnCompleted();
+            }
+            catch (Exception ex)
+            {
+                if (ex is OperationCanceledException) return;
+
+                observer.OnError(ex);
+            }
+            finally
+            {
+                if (e != null)
+                {
+                    await e.DisposeAsync();
+                }
+            }
+        }
+
+        public static async UniTaskVoid SubscribeAwaitCore<TSource>(IUniTaskAsyncEnumerable<TSource> source, Func<TSource, UniTask> onNext, Action<Exception> onError, Action onCompleted, CancellationToken cancellationToken)
+        {
+            var e = source.GetAsyncEnumerator(cancellationToken);
+            try
+            {
+                while (await e.MoveNextAsync())
+                {
+                    try
+                    {
+                        await onNext(e.Current);
+                    }
+                    catch (Exception ex)
+                    {
+                        UniTaskScheduler.PublishUnobservedTaskException(ex);
+                    }
+                }
+                onCompleted();
+            }
+            catch (Exception ex)
+            {
+                if (onError == NopError)
+                {
+                    UniTaskScheduler.PublishUnobservedTaskException(ex);
+                    return;
+                }
+
+                if (ex is OperationCanceledException) return;
+
+                onError(ex);
+            }
+            finally
+            {
+                if (e != null)
+                {
+                    await e.DisposeAsync();
+                }
+            }
+        }
+
+        public static async UniTaskVoid SubscribeAwaitCore<TSource>(IUniTaskAsyncEnumerable<TSource> source, Func<TSource, CancellationToken, UniTask> onNext, Action<Exception> onError, Action onCompleted, CancellationToken cancellationToken)
+        {
+            var e = source.GetAsyncEnumerator(cancellationToken);
+            try
+            {
+                while (await e.MoveNextAsync())
+                {
+                    try
+                    {
+                        await onNext(e.Current, cancellationToken);
+                    }
+                    catch (Exception ex)
+                    {
+                        UniTaskScheduler.PublishUnobservedTaskException(ex);
+                    }
+                }
+                onCompleted();
+            }
+            catch (Exception ex)
+            {
+                if (onError == NopError)
+                {
+                    UniTaskScheduler.PublishUnobservedTaskException(ex);
+                    return;
+                }
+
+                if (ex is OperationCanceledException) return;
+
+                onError(ex);
+            }
+            finally
+            {
+                if (e != null)
+                {
+                    await e.DisposeAsync();
+                }
+            }
+        }
+
+    }
+}

src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Subscribe.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 263479eb04c189741931fc0e2f615c2d
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/TakeUntil.cs

@@ -0,0 +1,190 @@
+using Cysharp.Threading.Tasks.Internal;
+using System;
+using System.Threading;
+
+namespace Cysharp.Threading.Tasks.Linq
+{
+    public static partial class UniTaskAsyncEnumerable
+    {
+        public static IUniTaskAsyncEnumerable<TSource> TakeUntil<TSource>(this IUniTaskAsyncEnumerable<TSource> source, UniTask other)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+
+            return new TakeUntil<TSource>(source, other, null);
+        }
+
+        public static IUniTaskAsyncEnumerable<TSource> TakeUntil<TSource>(this IUniTaskAsyncEnumerable<TSource> source, Func<CancellationToken, UniTask> other)
+        {
+            Error.ThrowArgumentNullException(source, nameof(source));
+            Error.ThrowArgumentNullException(source, nameof(other));
+
+            return new TakeUntil<TSource>(source, default, other);
+        }
+    }
+
+    internal sealed class TakeUntil<TSource> : IUniTaskAsyncEnumerable<TSource>
+    {
+        readonly IUniTaskAsyncEnumerable<TSource> source;
+        readonly UniTask other;
+        readonly Func<CancellationToken, UniTask> other2;
+
+        public TakeUntil(IUniTaskAsyncEnumerable<TSource> source, UniTask other, Func<CancellationToken, UniTask> other2)
+        {
+            this.source = source;
+            this.other = other;
+            this.other2 = other2;
+        }
+
+        public IUniTaskAsyncEnumerator<TSource> GetAsyncEnumerator(CancellationToken cancellationToken = default)
+        {
+            if (other2 != null)
+            {
+                return new _TakeUntil(source, this.other2(cancellationToken), cancellationToken);
+            }
+            else
+            {
+                return new _TakeUntil(source, this.other, cancellationToken);
+            }
+        }
+
+        sealed class _TakeUntil : MoveNextSource, IUniTaskAsyncEnumerator<TSource>
+        {
+            static readonly Action<object> CancelDelegate1 = OnCanceled1;
+            static readonly Action<object> MoveNextCoreDelegate = MoveNextCore;
+
+            readonly IUniTaskAsyncEnumerable<TSource> source;
+            CancellationToken cancellationToken1;
+            CancellationTokenRegistration cancellationTokenRegistration1;
+
+            bool completed;
+            Exception exception;
+            IUniTaskAsyncEnumerator<TSource> enumerator;
+            UniTask<bool>.Awaiter awaiter;
+
+            public _TakeUntil(IUniTaskAsyncEnumerable<TSource> source, UniTask other, CancellationToken cancellationToken1)
+            {
+                this.source = source;
+                this.cancellationToken1 = cancellationToken1;
+
+                if (cancellationToken1.CanBeCanceled)
+                {
+                    this.cancellationTokenRegistration1 = cancellationToken1.RegisterWithoutCaptureExecutionContext(CancelDelegate1, this);
+                }
+
+                TaskTracker.TrackActiveTask(this, 3);
+
+                RunOther(other).Forget();
+            }
+
+            public TSource Current { get; private set; }
+
+            public UniTask<bool> MoveNextAsync()
+            {
+                if (completed)
+                {
+                    return CompletedTasks.False;
+                }
+
+                if (exception != null)
+                {
+                    return UniTask.FromException<bool>(exception);
+                }
+
+                if (cancellationToken1.IsCancellationRequested)
+                {
+                    return UniTask.FromCanceled<bool>(cancellationToken1);
+                }
+
+                if (enumerator == null)
+                {
+                    enumerator = source.GetAsyncEnumerator(cancellationToken1);
+                }
+
+                completionSource.Reset();
+                SourceMoveNext();
+                return new UniTask<bool>(this, completionSource.Version);
+            }
+
+            void SourceMoveNext()
+            {
+                try
+                {
+                    awaiter = enumerator.MoveNextAsync().GetAwaiter();
+                    if (awaiter.IsCompleted)
+                    {
+                        MoveNextCore(this);
+                    }
+                    else
+                    {
+                        awaiter.SourceOnCompleted(MoveNextCoreDelegate, this);
+                    }
+                }
+                catch (Exception ex)
+                {
+                    completionSource.TrySetException(ex);
+                }
+            }
+
+            static void MoveNextCore(object state)
+            {
+                var self = (_TakeUntil)state;
+
+                if (self.TryGetResult(self.awaiter, out var result))
+                {
+                    if (result)
+                    {
+                        if (self.exception != null)
+                        {
+                            self.completionSource.TrySetException(self.exception);
+                        }
+                        else if (self.cancellationToken1.IsCancellationRequested)
+                        {
+                            self.completionSource.TrySetCanceled(self.cancellationToken1);
+                        }
+                        else
+                        {
+                            self.Current = self.enumerator.Current;
+                            self.completionSource.TrySetResult(true);
+                        }
+                    }
+                    else
+                    {
+                        self.completionSource.TrySetResult(false);
+                    }
+                }
+            }
+
+            async UniTaskVoid RunOther(UniTask other)
+            {
+                try
+                {
+                    await other;
+                    completed = true;
+                    completionSource.TrySetResult(false);
+                }
+                catch (Exception ex)
+                {
+                    exception = ex;
+                    completionSource.TrySetException(ex);
+                }
+            }
+
+            static void OnCanceled1(object state)
+            {
+                var self = (_TakeUntil)state;
+                self.completionSource.TrySetCanceled(self.cancellationToken1);
+            }
+
+            public UniTask DisposeAsync()
+            {
+                TaskTracker.RemoveTracking(this);
+                cancellationTokenRegistration1.Dispose();
+                if (enumerator != null)
+                {
+                    return enumerator.DisposeAsync();
+                }
+                return default;
+            }
+        }
+    }
+}

src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/TakeUntil.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 12bda324162f15349afefc2c152ac07f
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/ToUniTaskAsyncEnumerable.cs

@@ -248,15 +248,18 @@ namespace Cysharp.Threading.Tasks.Linq
                         return current;
                     }
 
-                    if (queuedResult.Count != 0)
+                    lock (queuedResult)
                     {
-                        current = queuedResult.Dequeue();
+                        if (queuedResult.Count != 0)
-                        useCachedCurrent = true;
+                        {
-                        return current;
+                            current = queuedResult.Dequeue();
-                    }
+                            useCachedCurrent = true;
-                    else
+                            return current;
-                    {
+                        }
-                        return default; // undefined.
+                        else
+                        {
+                            return default; // undefined.
+                        }
                     }
                 }
             }

src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/UniTask.Linq.asmdef

@@ -0,0 +1,15 @@
+{
+    "name": "UniTask.Linq",
+    "references": [
+        "UniTask"
+    ],
+    "includePlatforms": [],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": false,
+    "precompiledReferences": [],
+    "autoReferenced": true,
+    "defineConstraints": [],
+    "versionDefines": [],
+    "noEngineReferences": false
+}

src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/UniTask.Linq.asmdef.meta

@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: 5c01796d064528144a599661eaab93a6
+AssemblyDefinitionImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/UnityExtensions/EveryUpdate.cs

@@ -34,6 +34,7 @@ namespace Cysharp.Threading.Tasks.Linq
             public _EveryUpdate(PlayerLoopTiming updateTiming, CancellationToken cancellationToken)
             {
                 this.updateTiming = updateTiming;
+                this.cancellationToken = cancellationToken;
 
                 TaskTracker.TrackActiveTask(this, 2);
                 PlayerLoopHelper.AddAction(updateTiming, this);

src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/UnityExtensions/EveryValueChanged.cs

@@ -208,7 +208,6 @@ namespace Cysharp.Threading.Tasks.Linq
 
             public bool MoveNext()
             {
-                UnityEngine.Debug.Log("TRY_RESULT:" + target.TryGetTarget(out var _));
                 if (disposed || cancellationToken.IsCancellationRequested || !target.TryGetTarget(out var t))
                 {
                     completionSource.TrySetResult(false);

src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/UnityExtensions/Timer.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Threading;
+using UnityEngine;
 
 namespace Cysharp.Threading.Tasks.Linq
 {
@@ -22,16 +23,34 @@ namespace Cysharp.Threading.Tasks.Linq
 
         public static IUniTaskAsyncEnumerable<AsyncUnit> TimerFrame(int dueTimeFrameCount, PlayerLoopTiming updateTiming = PlayerLoopTiming.Update)
         {
+            if (dueTimeFrameCount < 0)
+            {
+                throw new ArgumentOutOfRangeException("Delay does not allow minus delayFrameCount. dueTimeFrameCount:" + dueTimeFrameCount);
+            }
+
             return new TimerFrame(dueTimeFrameCount, null, updateTiming);
         }
 
         public static IUniTaskAsyncEnumerable<AsyncUnit> TimerFrame(int dueTimeFrameCount, int periodFrameCount, PlayerLoopTiming updateTiming = PlayerLoopTiming.Update)
         {
+            if (dueTimeFrameCount < 0)
+            {
+                throw new ArgumentOutOfRangeException("Delay does not allow minus delayFrameCount. dueTimeFrameCount:" + dueTimeFrameCount);
+            }
+            if (periodFrameCount < 0)
+            {
+                throw new ArgumentOutOfRangeException("Delay does not allow minus periodFrameCount. periodFrameCount:" + dueTimeFrameCount);
+            }
+
             return new TimerFrame(dueTimeFrameCount, periodFrameCount, updateTiming);
         }
 
         public static IUniTaskAsyncEnumerable<AsyncUnit> IntervalFrame(int intervalFrameCount, PlayerLoopTiming updateTiming = PlayerLoopTiming.Update)
         {
+            if (intervalFrameCount < 0)
+            {
+                throw new ArgumentOutOfRangeException("Delay does not allow minus intervalFrameCount. intervalFrameCount:" + intervalFrameCount);
+            }
             return new TimerFrame(intervalFrameCount, intervalFrameCount, updateTiming);
         }
     }
@@ -64,6 +83,7 @@ namespace Cysharp.Threading.Tasks.Linq
             readonly bool ignoreTimeScale;
             CancellationToken cancellationToken;
 
+            int initialFrame;
             float elapsed;
             bool dueTimePhase;
             bool completed;
@@ -80,9 +100,11 @@ namespace Cysharp.Threading.Tasks.Linq
                     if (this.period <= 0) this.period = 1;
                 }
 
+                this.initialFrame = PlayerLoopHelper.IsMainThread ? Time.frameCount : -1;
                 this.dueTimePhase = true;
                 this.updateTiming = updateTiming;
                 this.ignoreTimeScale = ignoreTimeScale;
+                this.cancellationToken = cancellationToken;
                 TaskTracker.TrackActiveTask(this, 2);
                 PlayerLoopHelper.AddAction(updateTiming, this);
             }
@@ -119,9 +141,19 @@ namespace Cysharp.Threading.Tasks.Linq
                     return false;
                 }
 
-                elapsed += (ignoreTimeScale) ? UnityEngine.Time.unscaledDeltaTime : UnityEngine.Time.deltaTime;
                 if (dueTimePhase)
                 {
+                    if (elapsed == 0)
+                    {
+                        // skip in initial frame.
+                        if (initialFrame == Time.frameCount)
+                        {
+                            return true;
+                        }
+                    }
+
+                    elapsed += (ignoreTimeScale) ? UnityEngine.Time.unscaledDeltaTime : UnityEngine.Time.deltaTime;
+
                     if (elapsed >= dueTime)
                     {
                         dueTimePhase = false;
@@ -137,6 +169,8 @@ namespace Cysharp.Threading.Tasks.Linq
                         return false;
                     }
 
+                    elapsed += (ignoreTimeScale) ? UnityEngine.Time.unscaledDeltaTime : UnityEngine.Time.deltaTime;
+
                     if (elapsed >= period)
                     {
                         completionSource.TrySetResult(true);
@@ -172,6 +206,7 @@ namespace Cysharp.Threading.Tasks.Linq
             readonly int? periodFrameCount;
             CancellationToken cancellationToken;
 
+            int initialFrame;
             int currentFrame;
             bool dueTimePhase;
             bool completed;
@@ -185,9 +220,11 @@ namespace Cysharp.Threading.Tasks.Linq
                     if (periodFrameCount <= 0) periodFrameCount = 1;
                 }
 
+                this.initialFrame = PlayerLoopHelper.IsMainThread ? Time.frameCount : -1;
                 this.dueTimePhase = true;
                 this.dueTimeFrameCount = dueTimeFrameCount;
                 this.periodFrameCount = periodFrameCount;
+                this.cancellationToken = cancellationToken;
 
                 TaskTracker.TrackActiveTask(this, 2);
                 PlayerLoopHelper.AddAction(updateTiming, this);
@@ -228,11 +265,30 @@ namespace Cysharp.Threading.Tasks.Linq
 
                 if (dueTimePhase)
                 {
-                    if (currentFrame++ >= dueTimeFrameCount)
+                    if (currentFrame == 0)
+                    {
+                        if (dueTimeFrameCount == 0)
+                        {
+                            dueTimePhase = false;
+                            completionSource.TrySetResult(true);
+                            return true;
+                        }
+
+                        // skip in initial frame.
+                        if (initialFrame == Time.frameCount)
+                        {
+                            return true;
+                        }
+                    }
+
+                    if (++currentFrame >= dueTimeFrameCount)
                     {
                         dueTimePhase = false;
                         completionSource.TrySetResult(true);
                     }
+                    else
+                    {
+                    }
                 }
                 else
                 {

src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Where.cs

@@ -71,36 +71,103 @@ namespace Cysharp.Threading.Tasks.Linq
             return new _Where(source, predicate, cancellationToken);
         }
 
-        class _Where : AsyncEnumeratorBase<TSource, TSource>
+        sealed class _Where : MoveNextSource, IUniTaskAsyncEnumerator<TSource>
         {
+            readonly IUniTaskAsyncEnumerable<TSource> source;
             readonly Func<TSource, bool> predicate;
+            readonly CancellationToken cancellationToken;
+
+            int state = -1;
+            IUniTaskAsyncEnumerator<TSource> enumerator;
+            UniTask<bool>.Awaiter awaiter;
+            Action moveNextAction;
 
             public _Where(IUniTaskAsyncEnumerable<TSource> source, Func<TSource, bool> predicate, CancellationToken cancellationToken)
-
-                : base(source, cancellationToken)
             {
+                this.source = source;
                 this.predicate = predicate;
+                this.cancellationToken = cancellationToken;
+                this.moveNextAction = MoveNext;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
-            protected override bool TryMoveNextCore(bool sourceHasCurrent, out bool result)
+            public TSource Current { get; private set; }
+
+            public UniTask<bool> MoveNextAsync()
             {
-                if (sourceHasCurrent)
+                if (state == -2) return default;
+
+                completionSource.Reset();
+                MoveNext();
+                return new UniTask<bool>(this, completionSource.Version);
+            }
+
+            void MoveNext()
+            {
+                REPEAT:
+                try
                 {
-                    if (predicate(SourceCurrent))
+                    switch (state)
                     {
-                        Current = SourceCurrent;
+                        case -1: // init
-                        result = true;
+                            enumerator = source.GetAsyncEnumerator(cancellationToken);
-                        return true;
+                            goto case 0;
-                    }
+                        case 0:
-                    else
+                            awaiter = enumerator.MoveNextAsync().GetAwaiter();
-                    {
+                            if (awaiter.IsCompleted)
-                        result = default;
+                            {
-                        return false;
+                                goto case 1;
+                            }
+                            else
+                            {
+                                state = 1;
+                                awaiter.UnsafeOnCompleted(moveNextAction);
+                                return;
+                            }
+                        case 1:
+                            if (awaiter.GetResult())
+                            {
+                                Current = enumerator.Current;
+                                if (predicate(Current))
+                                {
+                                    goto CONTINUE;
+                                }
+                                else
+                                {
+                                    state = 0;
+                                    goto REPEAT;
+                                }
+                            }
+                            else
+                            {
+                                goto DONE;
+                            }
+                        default:
+                            goto DONE;
                     }
                 }
+                catch (Exception ex)
+                {
+                    state = -2;
+                    completionSource.TrySetException(ex);
+                    return;
+                }
 
-                result = false;
+                DONE:
-                return true;
+                state = -2;
+                completionSource.TrySetResult(false);
+                return;
+
+                CONTINUE:
+                state = 0;
+                completionSource.TrySetResult(true);
+                return;
+            }
+
+            public UniTask DisposeAsync()
+            {
+                TaskTracker.RemoveTracking(this);
+                return enumerator.DisposeAsync();
             }
         }
     }
@@ -118,40 +185,107 @@ namespace Cysharp.Threading.Tasks.Linq
 
         public IUniTaskAsyncEnumerator<TSource> GetAsyncEnumerator(CancellationToken cancellationToken = default)
         {
-            return new _WhereInt(source, predicate, cancellationToken);
+            return new _Where(source, predicate, cancellationToken);
         }
 
-        class _WhereInt : AsyncEnumeratorBase<TSource, TSource>
+        sealed class _Where : MoveNextSource, IUniTaskAsyncEnumerator<TSource>
         {
+            readonly IUniTaskAsyncEnumerable<TSource> source;
             readonly Func<TSource, int, bool> predicate;
+            readonly CancellationToken cancellationToken;
+
+            int state = -1;
+            IUniTaskAsyncEnumerator<TSource> enumerator;
+            UniTask<bool>.Awaiter awaiter;
+            Action moveNextAction;
             int index;
 
-            public _WhereInt(IUniTaskAsyncEnumerable<TSource> source, Func<TSource, int, bool> predicate, CancellationToken cancellationToken)
+            public _Where(IUniTaskAsyncEnumerable<TSource> source, Func<TSource, int, bool> predicate, CancellationToken cancellationToken)
-
-                : base(source, cancellationToken)
             {
+                this.source = source;
                 this.predicate = predicate;
+                this.cancellationToken = cancellationToken;
+                this.moveNextAction = MoveNext;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
-            protected override bool TryMoveNextCore(bool sourceHasCurrent, out bool result)
+            public TSource Current { get; private set; }
+
+            public UniTask<bool> MoveNextAsync()
             {
-                if (sourceHasCurrent)
+                if (state == -2) return default;
+
+                completionSource.Reset();
+                MoveNext();
+                return new UniTask<bool>(this, completionSource.Version);
+            }
+
+            void MoveNext()
+            {
+                REPEAT:
+                try
                 {
-                    if (predicate(SourceCurrent, checked(index++)))
+                    switch (state)
                     {
-                        Current = SourceCurrent;
+                        case -1: // init
-                        result = true;
+                            enumerator = source.GetAsyncEnumerator(cancellationToken);
-                        return true;
+                            goto case 0;
-                    }
+                        case 0:
-                    else
+                            awaiter = enumerator.MoveNextAsync().GetAwaiter();
-                    {
+                            if (awaiter.IsCompleted)
-                        result = default;
+                            {
-                        return false;
+                                goto case 1;
+                            }
+                            else
+                            {
+                                state = 1;
+                                awaiter.UnsafeOnCompleted(moveNextAction);
+                                return;
+                            }
+                        case 1:
+                            if (awaiter.GetResult())
+                            {
+                                Current = enumerator.Current;
+                                if (predicate(Current, checked(index++)))
+                                {
+                                    goto CONTINUE;
+                                }
+                                else
+                                {
+                                    state = 0;
+                                    goto REPEAT;
+                                }
+                            }
+                            else
+                            {
+                                goto DONE;
+                            }
+                        default:
+                            goto DONE;
                     }
                 }
+                catch (Exception ex)
+                {
+                    state = -2;
+                    completionSource.TrySetException(ex);
+                    return;
+                }
 
-                result = false;
+                DONE:
-                return true;
+                state = -2;
+                completionSource.TrySetResult(false);
+                return;
+
+                CONTINUE:
+                state = 0;
+                completionSource.TrySetResult(true);
+                return;
+            }
+
+            public UniTask DisposeAsync()
+            {
+                TaskTracker.RemoveTracking(this);
+                return enumerator.DisposeAsync();
             }
         }
     }
@@ -172,34 +306,117 @@ namespace Cysharp.Threading.Tasks.Linq
             return new _WhereAwait(source, predicate, cancellationToken);
         }
 
-        class _WhereAwait : AsyncEnumeratorAwaitSelectorBase<TSource, TSource, bool>
+        sealed class _WhereAwait : MoveNextSource, IUniTaskAsyncEnumerator<TSource>
         {
+            readonly IUniTaskAsyncEnumerable<TSource> source;
             readonly Func<TSource, UniTask<bool>> predicate;
+            readonly CancellationToken cancellationToken;
+
+            int state = -1;
+            IUniTaskAsyncEnumerator<TSource> enumerator;
+            UniTask<bool>.Awaiter awaiter;
+            UniTask<bool>.Awaiter awaiter2;
+            Action moveNextAction;
 
             public _WhereAwait(IUniTaskAsyncEnumerable<TSource> source, Func<TSource, UniTask<bool>> predicate, CancellationToken cancellationToken)
-
-                : base(source, cancellationToken)
             {
+                this.source = source;
                 this.predicate = predicate;
+                this.cancellationToken = cancellationToken;
+                this.moveNextAction = MoveNext;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
-            protected override UniTask<bool> TransformAsync(TSource sourceCurrent)
+            public TSource Current { get; private set; }
+
+            public UniTask<bool> MoveNextAsync()
             {
-                return predicate(sourceCurrent);
+                if (state == -2) return default;
+
+                completionSource.Reset();
+                MoveNext();
+                return new UniTask<bool>(this, completionSource.Version);
             }
 
-            protected override bool TrySetCurrentCore(bool awaitResult, out bool terminateIteration)
+            void MoveNext()
             {
-                terminateIteration = false;
+                REPEAT:
-                if (awaitResult)
+                try
                 {
-                    Current = SourceCurrent;
+                    switch (state)
-                    return true;
+                    {
+                        case -1: // init
+                            enumerator = source.GetAsyncEnumerator(cancellationToken);
+                            goto case 0;
+                        case 0:
+                            awaiter = enumerator.MoveNextAsync().GetAwaiter();
+                            if (awaiter.IsCompleted)
+                            {
+                                goto case 1;
+                            }
+                            else
+                            {
+                                state = 1;
+                                awaiter.UnsafeOnCompleted(moveNextAction);
+                                return;
+                            }
+                        case 1:
+                            if (awaiter.GetResult())
+                            {
+                                Current = enumerator.Current;
+
+                                awaiter2 = predicate(Current).GetAwaiter();
+                                if (awaiter2.IsCompleted)
+                                {
+                                    goto case 2;
+                                }
+                                else
+                                {
+                                    state = 2;
+                                    awaiter2.UnsafeOnCompleted(moveNextAction);
+                                    return;
+                                }
+                            }
+                            else
+                            {
+                                goto DONE;
+                            }
+                        case 2:
+                            if (awaiter2.GetResult())
+                            {
+                                goto CONTINUE;
+                            }
+                            else
+                            {
+                                state = 0;
+                                goto REPEAT;
+                            }
+                        default:
+                            goto DONE;
+                    }
                 }
-                else
+                catch (Exception ex)
                 {
-                    return false;
+                    state = -2;
+                    completionSource.TrySetException(ex);
+                    return;
                 }
+
+                DONE:
+                state = -2;
+                completionSource.TrySetResult(false);
+                return;
+
+                CONTINUE:
+                state = 0;
+                completionSource.TrySetResult(true);
+                return;
+            }
+
+            public UniTask DisposeAsync()
+            {
+                TaskTracker.RemoveTracking(this);
+                return enumerator.DisposeAsync();
             }
         }
     }
@@ -217,44 +434,125 @@ namespace Cysharp.Threading.Tasks.Linq
 
         public IUniTaskAsyncEnumerator<TSource> GetAsyncEnumerator(CancellationToken cancellationToken = default)
         {
-            return new _WhereIntAwait(source, predicate, cancellationToken);
+            return new _WhereAwait(source, predicate, cancellationToken);
         }
 
-        class _WhereIntAwait : AsyncEnumeratorAwaitSelectorBase<TSource, TSource, bool>
+        sealed class _WhereAwait : MoveNextSource, IUniTaskAsyncEnumerator<TSource>
         {
+            readonly IUniTaskAsyncEnumerable<TSource> source;
             readonly Func<TSource, int, UniTask<bool>> predicate;
+            readonly CancellationToken cancellationToken;
+
+            int state = -1;
+            IUniTaskAsyncEnumerator<TSource> enumerator;
+            UniTask<bool>.Awaiter awaiter;
+            UniTask<bool>.Awaiter awaiter2;
+            Action moveNextAction;
             int index;
 
-            public _WhereIntAwait(IUniTaskAsyncEnumerable<TSource> source, Func<TSource, int, UniTask<bool>> predicate, CancellationToken cancellationToken)
+            public _WhereAwait(IUniTaskAsyncEnumerable<TSource> source, Func<TSource, int, UniTask<bool>> predicate, CancellationToken cancellationToken)
-
-                : base(source, cancellationToken)
             {
+                this.source = source;
                 this.predicate = predicate;
+                this.cancellationToken = cancellationToken;
+                this.moveNextAction = MoveNext;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
-            protected override UniTask<bool> TransformAsync(TSource sourceCurrent)
+            public TSource Current { get; private set; }
+
+            public UniTask<bool> MoveNextAsync()
             {
-                return predicate(sourceCurrent, checked(index++));
+                if (state == -2) return default;
+
+                completionSource.Reset();
+                MoveNext();
+                return new UniTask<bool>(this, completionSource.Version);
             }
 
-            protected override bool TrySetCurrentCore(bool awaitResult, out bool terminateIteration)
+            void MoveNext()
             {
-                terminateIteration = false;
+                REPEAT:
-                if (awaitResult)
+                try
                 {
-                    Current = SourceCurrent;
+                    switch (state)
-                    return true;
+                    {
+                        case -1: // init
+                            enumerator = source.GetAsyncEnumerator(cancellationToken);
+                            goto case 0;
+                        case 0:
+                            awaiter = enumerator.MoveNextAsync().GetAwaiter();
+                            if (awaiter.IsCompleted)
+                            {
+                                goto case 1;
+                            }
+                            else
+                            {
+                                state = 1;
+                                awaiter.UnsafeOnCompleted(moveNextAction);
+                                return;
+                            }
+                        case 1:
+                            if (awaiter.GetResult())
+                            {
+                                Current = enumerator.Current;
+
+                                awaiter2 = predicate(Current, checked(index++)).GetAwaiter();
+                                if (awaiter2.IsCompleted)
+                                {
+                                    goto case 2;
+                                }
+                                else
+                                {
+                                    state = 2;
+                                    awaiter2.UnsafeOnCompleted(moveNextAction);
+                                    return;
+                                }
+                            }
+                            else
+                            {
+                                goto DONE;
+                            }
+                        case 2:
+                            if (awaiter2.GetResult())
+                            {
+                                goto CONTINUE;
+                            }
+                            else
+                            {
+                                state = 0;
+                                goto REPEAT;
+                            }
+                        default:
+                            goto DONE;
+                    }
                 }
-                else
+                catch (Exception ex)
                 {
-                    return false;
+                    state = -2;
+                    completionSource.TrySetException(ex);
+                    return;
                 }
+
+                DONE:
+                state = -2;
+                completionSource.TrySetResult(false);
+                return;
+
+                CONTINUE:
+                state = 0;
+                completionSource.TrySetResult(true);
+                return;
+            }
+
+            public UniTask DisposeAsync()
+            {
+                TaskTracker.RemoveTracking(this);
+                return enumerator.DisposeAsync();
             }
         }
     }
 
-
-
     internal sealed class WhereAwaitWithCancellation<TSource> : IUniTaskAsyncEnumerable<TSource>
     {
         readonly IUniTaskAsyncEnumerable<TSource> source;
@@ -271,34 +569,117 @@ namespace Cysharp.Threading.Tasks.Linq
             return new _WhereAwaitWithCancellation(source, predicate, cancellationToken);
         }
 
-        class _WhereAwaitWithCancellation : AsyncEnumeratorAwaitSelectorBase<TSource, TSource, bool>
+        sealed class _WhereAwaitWithCancellation : MoveNextSource, IUniTaskAsyncEnumerator<TSource>
         {
+            readonly IUniTaskAsyncEnumerable<TSource> source;
             readonly Func<TSource, CancellationToken, UniTask<bool>> predicate;
+            readonly CancellationToken cancellationToken;
+
+            int state = -1;
+            IUniTaskAsyncEnumerator<TSource> enumerator;
+            UniTask<bool>.Awaiter awaiter;
+            UniTask<bool>.Awaiter awaiter2;
+            Action moveNextAction;
 
             public _WhereAwaitWithCancellation(IUniTaskAsyncEnumerable<TSource> source, Func<TSource, CancellationToken, UniTask<bool>> predicate, CancellationToken cancellationToken)
-
-                : base(source, cancellationToken)
             {
+                this.source = source;
                 this.predicate = predicate;
+                this.cancellationToken = cancellationToken;
+                this.moveNextAction = MoveNext;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
-            protected override UniTask<bool> TransformAsync(TSource sourceCurrent)
+            public TSource Current { get; private set; }
+
+            public UniTask<bool> MoveNextAsync()
             {
-                return predicate(sourceCurrent, cancellationToken);
+                if (state == -2) return default;
+
+                completionSource.Reset();
+                MoveNext();
+                return new UniTask<bool>(this, completionSource.Version);
             }
 
-            protected override bool TrySetCurrentCore(bool awaitResult, out bool terminateIteration)
+            void MoveNext()
             {
-                terminateIteration = false;
+                REPEAT:
-                if (awaitResult)
+                try
                 {
-                    Current = SourceCurrent;
+                    switch (state)
-                    return true;
+                    {
+                        case -1: // init
+                            enumerator = source.GetAsyncEnumerator(cancellationToken);
+                            goto case 0;
+                        case 0:
+                            awaiter = enumerator.MoveNextAsync().GetAwaiter();
+                            if (awaiter.IsCompleted)
+                            {
+                                goto case 1;
+                            }
+                            else
+                            {
+                                state = 1;
+                                awaiter.UnsafeOnCompleted(moveNextAction);
+                                return;
+                            }
+                        case 1:
+                            if (awaiter.GetResult())
+                            {
+                                Current = enumerator.Current;
+
+                                awaiter2 = predicate(Current, cancellationToken).GetAwaiter();
+                                if (awaiter2.IsCompleted)
+                                {
+                                    goto case 2;
+                                }
+                                else
+                                {
+                                    state = 2;
+                                    awaiter2.UnsafeOnCompleted(moveNextAction);
+                                    return;
+                                }
+                            }
+                            else
+                            {
+                                goto DONE;
+                            }
+                        case 2:
+                            if (awaiter2.GetResult())
+                            {
+                                goto CONTINUE;
+                            }
+                            else
+                            {
+                                state = 0;
+                                goto REPEAT;
+                            }
+                        default:
+                            goto DONE;
+                    }
                 }
-                else
+                catch (Exception ex)
                 {
-                    return false;
+                    state = -2;
+                    completionSource.TrySetException(ex);
+                    return;
                 }
+
+                DONE:
+                state = -2;
+                completionSource.TrySetResult(false);
+                return;
+
+                CONTINUE:
+                state = 0;
+                completionSource.TrySetResult(true);
+                return;
+            }
+
+            public UniTask DisposeAsync()
+            {
+                TaskTracker.RemoveTracking(this);
+                return enumerator.DisposeAsync();
             }
         }
     }
@@ -316,40 +697,122 @@ namespace Cysharp.Threading.Tasks.Linq
 
         public IUniTaskAsyncEnumerator<TSource> GetAsyncEnumerator(CancellationToken cancellationToken = default)
         {
-            return new _WhereIntAwaitWithCancellation(source, predicate, cancellationToken);
+            return new _WhereAwaitWithCancellation(source, predicate, cancellationToken);
         }
 
-        class _WhereIntAwaitWithCancellation : AsyncEnumeratorAwaitSelectorBase<TSource, TSource, bool>
+        sealed class _WhereAwaitWithCancellation : MoveNextSource, IUniTaskAsyncEnumerator<TSource>
         {
+            readonly IUniTaskAsyncEnumerable<TSource> source;
             readonly Func<TSource, int, CancellationToken, UniTask<bool>> predicate;
+            readonly CancellationToken cancellationToken;
+
+            int state = -1;
+            IUniTaskAsyncEnumerator<TSource> enumerator;
+            UniTask<bool>.Awaiter awaiter;
+            UniTask<bool>.Awaiter awaiter2;
+            Action moveNextAction;
             int index;
 
-            public _WhereIntAwaitWithCancellation(IUniTaskAsyncEnumerable<TSource> source, Func<TSource, int, CancellationToken, UniTask<bool>> predicate, CancellationToken cancellationToken)
+            public _WhereAwaitWithCancellation(IUniTaskAsyncEnumerable<TSource> source, Func<TSource, int, CancellationToken, UniTask<bool>> predicate, CancellationToken cancellationToken)
-
-                : base(source, cancellationToken)
             {
+                this.source = source;
                 this.predicate = predicate;
+                this.cancellationToken = cancellationToken;
+                this.moveNextAction = MoveNext;
+                TaskTracker.TrackActiveTask(this, 3);
             }
 
-            protected override UniTask<bool> TransformAsync(TSource sourceCurrent)
+            public TSource Current { get; private set; }
+
+            public UniTask<bool> MoveNextAsync()
             {
-                return predicate(sourceCurrent, checked(index++), cancellationToken);
+                if (state == -2) return default;
+
+                completionSource.Reset();
+                MoveNext();
+                return new UniTask<bool>(this, completionSource.Version);
             }
 
-            protected override bool TrySetCurrentCore(bool awaitResult, out bool terminateIteration)
+            void MoveNext()
             {
-                terminateIteration = false;
+                REPEAT:
-                if (awaitResult)
+                try
                 {
-                    Current = SourceCurrent;
+                    switch (state)
-                    return true;
+                    {
+                        case -1: // init
+                            enumerator = source.GetAsyncEnumerator(cancellationToken);
+                            goto case 0;
+                        case 0:
+                            awaiter = enumerator.MoveNextAsync().GetAwaiter();
+                            if (awaiter.IsCompleted)
+                            {
+                                goto case 1;
+                            }
+                            else
+                            {
+                                state = 1;
+                                awaiter.UnsafeOnCompleted(moveNextAction);
+                                return;
+                            }
+                        case 1:
+                            if (awaiter.GetResult())
+                            {
+                                Current = enumerator.Current;
+
+                                awaiter2 = predicate(Current, checked(index++), cancellationToken).GetAwaiter();
+                                if (awaiter2.IsCompleted)
+                                {
+                                    goto case 2;
+                                }
+                                else
+                                {
+                                    state = 2;
+                                    awaiter2.UnsafeOnCompleted(moveNextAction);
+                                    return;
+                                }
+                            }
+                            else
+                            {
+                                goto DONE;
+                            }
+                        case 2:
+                            if (awaiter2.GetResult())
+                            {
+                                goto CONTINUE;
+                            }
+                            else
+                            {
+                                state = 0;
+                                goto REPEAT;
+                            }
+                        default:
+                            goto DONE;
+                    }
                 }
-                else
+                catch (Exception ex)
                 {
-                    return false;
+                    state = -2;
+                    completionSource.TrySetException(ex);
+                    return;
                 }
+
+                DONE:
+                state = -2;
+                completionSource.TrySetResult(false);
+                return;
+
+                CONTINUE:
+                state = 0;
+                completionSource.TrySetResult(true);
+                return;
+            }
+
+            public UniTask DisposeAsync()
+            {
+                TaskTracker.RemoveTracking(this);
+                return enumerator.DisposeAsync();
             }
         }
     }
-
 }

src/UniTask/Assets/Plugins/UniTask/Runtime/MoveNextSource.cs

@@ -0,0 +1,63 @@
+using System;
+
+namespace Cysharp.Threading.Tasks
+{
+    public abstract class MoveNextSource : IUniTaskSource<bool>
+    {
+        protected UniTaskCompletionSourceCore<bool> completionSource;
+
+        public bool GetResult(short token)
+        {
+            return completionSource.GetResult(token);
+        }
+
+        public UniTaskStatus GetStatus(short token)
+        {
+            return completionSource.GetStatus(token);
+        }
+
+        public void OnCompleted(Action<object> continuation, object state, short token)
+        {
+            completionSource.OnCompleted(continuation, state, token);
+        }
+
+        public UniTaskStatus UnsafeGetStatus()
+        {
+            return completionSource.UnsafeGetStatus();
+        }
+
+        void IUniTaskSource.GetResult(short token)
+        {
+            completionSource.GetResult(token);
+        }
+
+        protected bool TryGetResult<T>(UniTask<T>.Awaiter awaiter, out T result)
+        {
+            try
+            {
+                result = awaiter.GetResult();
+                return true;
+            }
+            catch (Exception ex)
+            {
+                completionSource.TrySetException(ex);
+                result = default;
+                return false;
+            }
+        }
+
+        protected bool TryGetResult(UniTask.Awaiter awaiter)
+        {
+            try
+            {
+                awaiter.GetResult();
+                return true;
+            }
+            catch (Exception ex)
+            {
+                completionSource.TrySetException(ex);
+                return false;
+            }
+        }
+    }
+}

src/UniTask/Assets/Plugins/UniTask/Runtime/MoveNextSource.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: dc4c5dc2a5f246e4f8df44cab735826c
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

src/UniTask/Assets/Plugins/UniTask/Runtime/PlayerLoopHelper.cs

@@ -8,8 +8,10 @@ using System.Threading;
 
 #if UNITY_2019_3_OR_NEWER
 using UnityEngine.LowLevel;
+using PlayerLoopType = UnityEngine.PlayerLoop;
 #else
 using UnityEngine.Experimental.LowLevel;
+using PlayerLoopType = UnityEngine.Experimental.PlayerLoop;
 #endif
 
 #if UNITY_EDITOR
@@ -57,6 +59,13 @@ namespace Cysharp.Threading.Tasks
         public struct UniTaskLoopRunnerLastYieldUpdate { };
         public struct UniTaskLoopRunnerLastYieldPreLateUpdate { };
         public struct UniTaskLoopRunnerLastYieldPostLateUpdate { };
+
+#if UNITY_2020_2_OR_NEWER
+        public struct UniTaskLoopRunnerTimeUpdate { };
+        public struct UniTaskLoopRunnerLastTimeUpdate { };
+        public struct UniTaskLoopRunnerYieldTimeUpdate { };
+        public struct UniTaskLoopRunnerLastYieldTimeUpdate { };
+#endif
     }
 
     public enum PlayerLoopTiming
@@ -80,7 +89,13 @@ namespace Cysharp.Threading.Tasks
         LastPreLateUpdate = 11,
 
         PostLateUpdate = 12,
-        LastPostLateUpdate = 13
+        LastPostLateUpdate = 13,
+
+#if UNITY_2020_2_OR_NEWER
+        // Unity 2020.2 added TimeUpdate https://docs.unity3d.com/2020.2/Documentation/ScriptReference/PlayerLoop.TimeUpdate.html
+        TimeUpdate = 14,
+        LastTimeUpdate = 15,
+#endif
     }
 
     public interface IPlayerLoopItem
@@ -92,12 +107,16 @@ namespace Cysharp.Threading.Tasks
     {
         public static SynchronizationContext UnitySynchronizationContext => unitySynchronizationContetext;
         public static int MainThreadId => mainThreadId;
+        internal static string ApplicationDataPath => applicationDataPath;
+
+        public static bool IsMainThread => Thread.CurrentThread.ManagedThreadId == mainThreadId;
 
         static int mainThreadId;
+        static string applicationDataPath;
         static SynchronizationContext unitySynchronizationContetext;
         static ContinuationQueue[] yielders;
         static PlayerLoopRunner[] runners;
-
+        internal static bool IsEditorApplicationQuitting { get; private set; }
         static PlayerLoopSystem[] InsertRunner(PlayerLoopSystem loopSystem,
             Type loopRunnerYieldType, ContinuationQueue cq, Type lastLoopRunnerYieldType, ContinuationQueue lastCq,
             Type loopRunnerType, PlayerLoopRunner runner, Type lastLoopRunnerType, PlayerLoopRunner lastRunner)
@@ -106,27 +125,32 @@ namespace Cysharp.Threading.Tasks
 #if UNITY_EDITOR
             EditorApplication.playModeStateChanged += (state) =>
             {
-                if (state == PlayModeStateChange.EnteredEditMode || state == PlayModeStateChange.EnteredPlayMode)
+                if (state == PlayModeStateChange.EnteredEditMode || state == PlayModeStateChange.ExitingEditMode)
                 {
-                    return;
+                    IsEditorApplicationQuitting = true;
-                }
+                    // run rest action before clear.
+                    if (runner != null)
+                    {
+                        runner.Run();
+                        runner.Clear();
+                    }
+                    if (lastRunner != null)
+                    {
+                        lastRunner.Run();
+                        lastRunner.Clear();
+                    }
 
-                if (runner != null)
+                    if (cq != null)
-                {
+                    {
-                    runner.Clear();
+                        cq.Run();
-                }
+                        cq.Clear();
-                if (lastRunner != null)
+                    }
-                {
+                    if (lastCq != null)
-                    lastRunner.Clear();
+                    {
-                }
+                        lastCq.Run();
-
+                        lastCq.Clear();
-                if (cq != null)
+                    }
-                {
+                    IsEditorApplicationQuitting = false;
-                    cq.Clear();
-                }
-                if (lastCq != null)
-                {
-                    lastCq.Clear();
                 }
             };
 #endif
@@ -171,12 +195,43 @@ namespace Cysharp.Threading.Tasks
             return dest;
         }
 
+        static PlayerLoopSystem[] InsertUniTaskSynchronizationContext(PlayerLoopSystem loopSystem)
+        {
+            var loop = new PlayerLoopSystem
+            {
+                type = typeof(UniTaskSynchronizationContext),
+                updateDelegate = UniTaskSynchronizationContext.Run
+            };
+
+            // Remove items from previous initializations.
+            var source = loopSystem.subSystemList
+                .Where(ls => ls.type != typeof(UniTaskSynchronizationContext))
+                .ToArray();
+
+            var dest = new System.Collections.Generic.List<PlayerLoopSystem>(source);
+
+            var index = dest.FindIndex(x => x.type.Name == "ScriptRunDelayedTasks");
+            if (index == -1)
+            {
+                index = dest.FindIndex(x => x.type.Name == "UniTaskLoopRunnerUpdate");
+            }
+
+            dest.Insert(index + 1, loop);
+
+            return dest.ToArray();
+        }
+
         [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.BeforeSceneLoad)]
         static void Init()
         {
             // capture default(unity) sync-context.
             unitySynchronizationContetext = SynchronizationContext.Current;
             mainThreadId = Thread.CurrentThread.ManagedThreadId;
+            try
+            {
+                applicationDataPath = Application.dataPath;
+            }
+            catch { }
 
 #if UNITY_EDITOR && UNITY_2019_3_OR_NEWER
             // When domain reload is disabled, re-initialization is required when entering play mode; 
@@ -237,52 +292,90 @@ namespace Cysharp.Threading.Tasks
                     if (item != null) item.Run();
                 }
             }
+
+            UniTaskSynchronizationContext.Run();
         }
 
 #endif
 
+        private static int FindLoopSystemIndex(PlayerLoopSystem[] playerLoopList, Type systemType)
+        {
+            for (int i = 0; i < playerLoopList.Length; i++)
+            {
+                if (playerLoopList[i].type == systemType)
+                {
+                    return i;
+                }
+            }
+
+            throw new Exception("Target PlayerLoopSystem does not found. Type:" + systemType.FullName);
+        }
+
         public static void Initialize(ref PlayerLoopSystem playerLoop)
         {
+#if UNITY_2020_2_OR_NEWER
+            yielders = new ContinuationQueue[16];
+            runners = new PlayerLoopRunner[16];
+#else
             yielders = new ContinuationQueue[14];
             runners = new PlayerLoopRunner[14];
+#endif
 
             var copyList = playerLoop.subSystemList.ToArray();
 
-            // Initialization
+            var i = FindLoopSystemIndex(copyList, typeof(PlayerLoopType.Initialization));
-            copyList[0].subSystemList = InsertRunner(copyList[0], typeof(UniTaskLoopRunners.UniTaskLoopRunnerYieldInitialization), yielders[0] = new ContinuationQueue(PlayerLoopTiming.Initialization),
+            copyList[i].subSystemList = InsertRunner(copyList[i], typeof(UniTaskLoopRunners.UniTaskLoopRunnerYieldInitialization), yielders[0] = new ContinuationQueue(PlayerLoopTiming.Initialization),
                                                                   typeof(UniTaskLoopRunners.UniTaskLoopRunnerLastYieldInitialization), yielders[1] = new ContinuationQueue(PlayerLoopTiming.LastInitialization),
-                                                                  typeof(UniTaskLoopRunners.UniTaskLoopRunnerInitialization), runners[1] = new PlayerLoopRunner(PlayerLoopTiming.Initialization),
+                                                                  typeof(UniTaskLoopRunners.UniTaskLoopRunnerInitialization), runners[0] = new PlayerLoopRunner(PlayerLoopTiming.Initialization),
                                                                   typeof(UniTaskLoopRunners.UniTaskLoopRunnerLastInitialization), runners[1] = new PlayerLoopRunner(PlayerLoopTiming.LastInitialization));
             // EarlyUpdate
-            copyList[1].subSystemList = InsertRunner(copyList[1], typeof(UniTaskLoopRunners.UniTaskLoopRunnerYieldEarlyUpdate), yielders[2] = new ContinuationQueue(PlayerLoopTiming.EarlyUpdate),
+            i = FindLoopSystemIndex(copyList, typeof(PlayerLoopType.EarlyUpdate));
+            copyList[i].subSystemList = InsertRunner(copyList[i], typeof(UniTaskLoopRunners.UniTaskLoopRunnerYieldEarlyUpdate), yielders[2] = new ContinuationQueue(PlayerLoopTiming.EarlyUpdate),
                                                                   typeof(UniTaskLoopRunners.UniTaskLoopRunnerLastYieldEarlyUpdate), yielders[3] = new ContinuationQueue(PlayerLoopTiming.LastEarlyUpdate),
                                                                   typeof(UniTaskLoopRunners.UniTaskLoopRunnerEarlyUpdate), runners[2] = new PlayerLoopRunner(PlayerLoopTiming.EarlyUpdate),
                                                                   typeof(UniTaskLoopRunners.UniTaskLoopRunnerLastEarlyUpdate), runners[3] = new PlayerLoopRunner(PlayerLoopTiming.LastEarlyUpdate));
             // FixedUpdate
-            copyList[2].subSystemList = InsertRunner(copyList[2], typeof(UniTaskLoopRunners.UniTaskLoopRunnerYieldFixedUpdate), yielders[4] = new ContinuationQueue(PlayerLoopTiming.FixedUpdate),
+            i = FindLoopSystemIndex(copyList, typeof(PlayerLoopType.FixedUpdate));
+            copyList[i].subSystemList = InsertRunner(copyList[i], typeof(UniTaskLoopRunners.UniTaskLoopRunnerYieldFixedUpdate), yielders[4] = new ContinuationQueue(PlayerLoopTiming.FixedUpdate),
                                                                   typeof(UniTaskLoopRunners.UniTaskLoopRunnerLastYieldFixedUpdate), yielders[5] = new ContinuationQueue(PlayerLoopTiming.LastFixedUpdate),
                                                                   typeof(UniTaskLoopRunners.UniTaskLoopRunnerFixedUpdate), runners[4] = new PlayerLoopRunner(PlayerLoopTiming.FixedUpdate),
                                                                   typeof(UniTaskLoopRunners.UniTaskLoopRunnerLastFixedUpdate), runners[5] = new PlayerLoopRunner(PlayerLoopTiming.LastFixedUpdate));
             // PreUpdate
-            copyList[3].subSystemList = InsertRunner(copyList[3], typeof(UniTaskLoopRunners.UniTaskLoopRunnerYieldPreUpdate), yielders[6] = new ContinuationQueue(PlayerLoopTiming.PreUpdate),
+            i = FindLoopSystemIndex(copyList, typeof(PlayerLoopType.PreUpdate));
+            copyList[i].subSystemList = InsertRunner(copyList[i], typeof(UniTaskLoopRunners.UniTaskLoopRunnerYieldPreUpdate), yielders[6] = new ContinuationQueue(PlayerLoopTiming.PreUpdate),
                                                                   typeof(UniTaskLoopRunners.UniTaskLoopRunnerLastYieldPreUpdate), yielders[7] = new ContinuationQueue(PlayerLoopTiming.LastPreUpdate),
                                                                   typeof(UniTaskLoopRunners.UniTaskLoopRunnerPreUpdate), runners[6] = new PlayerLoopRunner(PlayerLoopTiming.PreUpdate),
                                                                   typeof(UniTaskLoopRunners.UniTaskLoopRunnerLastPreUpdate), runners[7] = new PlayerLoopRunner(PlayerLoopTiming.LastPreUpdate));
             // Update
-            copyList[4].subSystemList = InsertRunner(copyList[4], typeof(UniTaskLoopRunners.UniTaskLoopRunnerYieldUpdate), yielders[8] = new ContinuationQueue(PlayerLoopTiming.Update),
+            i = FindLoopSystemIndex(copyList, typeof(PlayerLoopType.Update));
+            copyList[i].subSystemList = InsertRunner(copyList[i], typeof(UniTaskLoopRunners.UniTaskLoopRunnerYieldUpdate), yielders[8] = new ContinuationQueue(PlayerLoopTiming.Update),
                                                                   typeof(UniTaskLoopRunners.UniTaskLoopRunnerLastYieldUpdate), yielders[9] = new ContinuationQueue(PlayerLoopTiming.LastUpdate),
                                                                   typeof(UniTaskLoopRunners.UniTaskLoopRunnerUpdate), runners[8] = new PlayerLoopRunner(PlayerLoopTiming.Update),
                                                                   typeof(UniTaskLoopRunners.UniTaskLoopRunnerLastUpdate), runners[9] = new PlayerLoopRunner(PlayerLoopTiming.LastUpdate));
             // PreLateUpdate
-            copyList[5].subSystemList = InsertRunner(copyList[5], typeof(UniTaskLoopRunners.UniTaskLoopRunnerYieldPreLateUpdate), yielders[10] = new ContinuationQueue(PlayerLoopTiming.PreLateUpdate),
+            i = FindLoopSystemIndex(copyList, typeof(PlayerLoopType.PreLateUpdate));
+            copyList[i].subSystemList = InsertRunner(copyList[i], typeof(UniTaskLoopRunners.UniTaskLoopRunnerYieldPreLateUpdate), yielders[10] = new ContinuationQueue(PlayerLoopTiming.PreLateUpdate),
                                                                   typeof(UniTaskLoopRunners.UniTaskLoopRunnerLastYieldPreLateUpdate), yielders[11] = new ContinuationQueue(PlayerLoopTiming.LastPreLateUpdate),
                                                                   typeof(UniTaskLoopRunners.UniTaskLoopRunnerPreLateUpdate), runners[10] = new PlayerLoopRunner(PlayerLoopTiming.PreLateUpdate),
                                                                   typeof(UniTaskLoopRunners.UniTaskLoopRunnerLastPreLateUpdate), runners[11] = new PlayerLoopRunner(PlayerLoopTiming.LastPreLateUpdate));
             // PostLateUpdate
-            copyList[6].subSystemList = InsertRunner(copyList[6], typeof(UniTaskLoopRunners.UniTaskLoopRunnerYieldPostLateUpdate), yielders[12] = new ContinuationQueue(PlayerLoopTiming.PostLateUpdate),
+            i = FindLoopSystemIndex(copyList, typeof(PlayerLoopType.PostLateUpdate));
+            copyList[i].subSystemList = InsertRunner(copyList[i], typeof(UniTaskLoopRunners.UniTaskLoopRunnerYieldPostLateUpdate), yielders[12] = new ContinuationQueue(PlayerLoopTiming.PostLateUpdate),
                                                                   typeof(UniTaskLoopRunners.UniTaskLoopRunnerLastYieldPostLateUpdate), yielders[13] = new ContinuationQueue(PlayerLoopTiming.LastPostLateUpdate),
                                                                   typeof(UniTaskLoopRunners.UniTaskLoopRunnerPostLateUpdate), runners[12] = new PlayerLoopRunner(PlayerLoopTiming.PostLateUpdate),
                                                                   typeof(UniTaskLoopRunners.UniTaskLoopRunnerLastPostLateUpdate), runners[13] = new PlayerLoopRunner(PlayerLoopTiming.LastPostLateUpdate));
+#if UNITY_2020_2_OR_NEWER
+            // TimeUpdate
+            i = FindLoopSystemIndex(copyList, typeof(PlayerLoopType.TimeUpdate));
+            copyList[i].subSystemList = InsertRunner(copyList[i], typeof(UniTaskLoopRunners.UniTaskLoopRunnerYieldTimeUpdate), yielders[14] = new ContinuationQueue(PlayerLoopTiming.TimeUpdate),
+                                                                    typeof(UniTaskLoopRunners.UniTaskLoopRunnerLastYieldTimeUpdate), yielders[15] = new ContinuationQueue(PlayerLoopTiming.LastTimeUpdate),
+                                                                    typeof(UniTaskLoopRunners.UniTaskLoopRunnerTimeUpdate), runners[14] = new PlayerLoopRunner(PlayerLoopTiming.TimeUpdate),
+                                                                    typeof(UniTaskLoopRunners.UniTaskLoopRunnerLastTimeUpdate), runners[15] = new PlayerLoopRunner(PlayerLoopTiming.LastTimeUpdate));
+#endif
+
+            // Insert UniTaskSynchronizationContext to Update loop
+            i = FindLoopSystemIndex(copyList, typeof(PlayerLoopType.Update));
+            copyList[i].subSystemList = InsertUniTaskSynchronizationContext(copyList[i]);
 
             playerLoop.subSystemList = copyList;
             PlayerLoop.SetPlayerLoop(playerLoop);
@@ -297,6 +390,56 @@ namespace Cysharp.Threading.Tasks
         {
             yielders[(int)timing].Enqueue(continuation);
         }
+
+        // Diagnostics helper
+
+#if UNITY_2019_3_OR_NEWER
+
+        public static void DumpCurrentPlayerLoop()
+        {
+            var playerLoop = UnityEngine.LowLevel.PlayerLoop.GetCurrentPlayerLoop();
+
+            var sb = new System.Text.StringBuilder();
+            sb.AppendLine($"PlayerLoop List");
+            foreach (var header in playerLoop.subSystemList)
+            {
+                sb.AppendFormat("------{0}------", header.type.Name);
+                sb.AppendLine();
+                foreach (var subSystem in header.subSystemList)
+                {
+                    sb.AppendFormat("{0}", subSystem.type.Name);
+                    sb.AppendLine();
+
+                    if (subSystem.subSystemList != null)
+                    {
+                        UnityEngine.Debug.LogWarning("More Subsystem:" + subSystem.subSystemList.Length);
+                    }
+                }
+            }
+
+            UnityEngine.Debug.Log(sb.ToString());
+        }
+
+        public static bool IsInjectedUniTaskPlayerLoop()
+        {
+            var playerLoop = UnityEngine.LowLevel.PlayerLoop.GetCurrentPlayerLoop();
+
+            foreach (var header in playerLoop.subSystemList)
+            {
+                foreach (var subSystem in header.subSystemList)
+                {
+                    if (subSystem.type == typeof(UniTaskLoopRunners.UniTaskLoopRunnerInitialization))
+                    {
+                        return true;
+                    }
+                }
+            }
+
+            return false;
+        }
+
+#endif
+
     }
 }
 

src/UniTask/Assets/Plugins/UniTask/Runtime/TaskPool.cs

@@ -5,7 +5,7 @@ using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 using System.Threading;
 
-namespace Cysharp.Threading.Tasks.Internal
+namespace Cysharp.Threading.Tasks
 {
     // internaly used but public, allow to user create custom operator with pooling.
 
@@ -13,6 +13,9 @@ namespace Cysharp.Threading.Tasks.Internal
     {
         internal static int MaxPoolSize;
 
+        // avoid to use ConcurrentDictionary for safety of WebGL build.
+        static Dictionary<Type, Func<int>> sizes = new Dictionary<Type, Func<int>>();
+
         static TaskPool()
         {
             try
@@ -36,12 +39,30 @@ namespace Cysharp.Threading.Tasks.Internal
         {
             MaxPoolSize = maxPoolSize;
         }
-    }
 
+        public static IEnumerable<(Type, int)> GetCacheSizeInfo()
+        {
+            lock (sizes)
+            {
+                foreach (var item in sizes)
+                {
+                    yield return (item.Key, item.Value());
+                }
+            }
+        }
+
+        public static void RegisterSizeGetter(Type type, Func<int> getSize)
+        {
+            lock (sizes)
+            {
+                sizes[type] = getSize;
+            }
+        }
+    }
 
     public interface ITaskPoolNode<T>
     {
-        T NextNode { get; set; }
+        ref T NextNode { get; }
     }
 
     // mutable struct, don't mark readonly.
@@ -63,8 +84,9 @@ namespace Cysharp.Threading.Tasks.Internal
                 var v = root;
                 if (!(v is null))
                 {
-                    root = v.NextNode;
+                    ref var nextNode = ref v.NextNode;
-                    v.NextNode = null;
+                    root = nextNode;
+                    nextNode = null;
                     size--;
                     result = v;
                     Volatile.Write(ref gate, 0);
@@ -98,22 +120,4 @@ namespace Cysharp.Threading.Tasks.Internal
             return false;
         }
     }
-
-    public static class TaskPoolMonitor
-    {
-        static ConcurrentDictionary<Type, Func<int>> sizes = new ConcurrentDictionary<Type, Func<int>>();
-
-        public static IEnumerable<(Type, int)> GetCacheSizeInfo()
-        {
-            foreach (var item in sizes)
-            {
-                yield return (item.Key, item.Value());
-            }
-        }
-
-        public static void RegisterSizeGetter(Type type, Func<int> getSize)
-        {
-            sizes[type] = getSize;
-        }
-    }
 }

src/UniTask/Assets/Plugins/UniTask/Runtime/TriggerEvent.cs

@@ -1,5 +1,4 @@
-using Cysharp.Threading.Tasks.Internal;
+using System;
-using System;
 using System.Threading;
 
 namespace Cysharp.Threading.Tasks
@@ -10,341 +9,302 @@ namespace Cysharp.Threading.Tasks
         void OnError(Exception ex);
         void OnCompleted();
         void OnCanceled(CancellationToken cancellationToken);
+
+        // set/get from TriggerEvent<T>
+        ITriggerHandler<T> Prev { get; set; }
+        ITriggerHandler<T> Next { get; set; }
     }
 
     // be careful to use, itself is struct.
     public struct TriggerEvent<T>
     {
-        // optimize: many cases, handler is single.
+        ITriggerHandler<T> head; // head.prev is last
-        ITriggerHandler<T> singleHandler;
+        ITriggerHandler<T> iteratingHead;
 
-        ITriggerHandler<T>[] handlers;
+        bool preserveRemoveSelf;
+        ITriggerHandler<T> iteratingNode;
 
-        // when running(in TrySetResult), does not add immediately(trampoline).
+        void LogError(Exception ex)
-        bool isRunning;
+        {
-        ITriggerHandler<T> waitHandler;
+#if UNITY_2018_3_OR_NEWER
-        MinimumQueue<ITriggerHandler<T>> waitQueue;
+            UnityEngine.Debug.LogException(ex);
+#else
+            Console.WriteLine(ex);
+#endif
+        }
 
         public void SetResult(T value)
         {
-            isRunning = true;
+            if (iteratingNode != null)
-
-            if (singleHandler != null)
             {
+                throw new InvalidOperationException("Can not trigger itself in iterating.");
+            }
+
+            var h = head;
+            while (h != null)
+            {
+                iteratingNode = h;
+
                 try
                 {
-                    singleHandler.OnNext(value);
+                    h.OnNext(value);
                 }
                 catch (Exception ex)
                 {
-#if UNITY_2018_3_OR_NEWER
+                    LogError(ex);
-                    UnityEngine.Debug.LogException(ex);
+                    Remove(h);
-#else
-                    Console.WriteLine(ex);
-#endif
                 }
-            }
 
-            if (handlers != null)
+                if (preserveRemoveSelf)
-            {
-                for (int i = 0; i < handlers.Length; i++)
                 {
-                    if (handlers[i] != null)
+                    preserveRemoveSelf = false;
-                    {
+                    iteratingNode = null;
-                        try
+                    var next = h.Next;
-                        {
+                    Remove(h);
-                            handlers[i].OnNext(value);
+                    h = next;
-                        }
-                        catch (Exception ex)
-                        {
-                            handlers[i] = null;
-#if UNITY_2018_3_OR_NEWER
-                            UnityEngine.Debug.LogException(ex);
-#else
-                            Console.WriteLine(ex);
-#endif
-                        }
-                    }
                 }
-            }
+                else
-
-            isRunning = false;
-
-            if (waitHandler != null)
-            {
-                var h = waitHandler;
-                waitHandler = null;
-                Add(h);
-            }
-
-            if (waitQueue != null)
-            {
-                while (waitQueue.Count != 0)
                 {
-                    Add(waitQueue.Dequeue());
+                    h = h.Next;
                 }
             }
+
+            iteratingNode = null;
+            if (iteratingHead != null)
+            {
+                Add(iteratingHead);
+                iteratingHead = null;
+            }
         }
 
         public void SetCanceled(CancellationToken cancellationToken)
         {
-            isRunning = true;
+            if (iteratingNode != null)
-
-            if (singleHandler != null)
             {
+                throw new InvalidOperationException("Can not trigger itself in iterating.");
+            }
+
+            var h = head;
+            while (h != null)
+            {
+                iteratingNode = h;
                 try
                 {
-                    (singleHandler).OnCanceled(cancellationToken);
+                    h.OnCanceled(cancellationToken);
                 }
                 catch (Exception ex)
                 {
-#if UNITY_2018_3_OR_NEWER
+                    LogError(ex);
-                    UnityEngine.Debug.LogException(ex);
-#else
-                    Console.WriteLine(ex);
-#endif
                 }
+
+                preserveRemoveSelf = false;
+                iteratingNode = null;
+                var next = h.Next;
+                Remove(h);
+                h = next;
             }
 
-            if (handlers != null)
+            iteratingNode = null;
+            if (iteratingHead != null)
             {
-                for (int i = 0; i < handlers.Length; i++)
+                Add(iteratingHead);
-                {
+                iteratingHead = null;
-                    if (handlers[i] != null)
-                    {
-                        try
-                        {
-                            (handlers[i]).OnCanceled(cancellationToken);
-                        }
-                        catch (Exception ex)
-                        {
-#if UNITY_2018_3_OR_NEWER
-                            UnityEngine.Debug.LogException(ex);
-#else
-                            Console.WriteLine(ex);
-#endif
-                            handlers[i] = null;
-                        }
-                    }
-                }
-            }
-
-            isRunning = false;
-
-            if (waitHandler != null)
-            {
-                var h = waitHandler;
-                waitHandler = null;
-                Add(h);
-            }
-
-            if (waitQueue != null)
-            {
-                while (waitQueue.Count != 0)
-                {
-                    Add(waitQueue.Dequeue());
-                }
             }
         }
 
         public void SetCompleted()
         {
-            isRunning = true;
+            if (iteratingNode != null)
-
-            if (singleHandler != null)
             {
+                throw new InvalidOperationException("Can not trigger itself in iterating.");
+            }
+
+            var h = head;
+            while (h != null)
+            {
+                iteratingNode = h;
                 try
                 {
-                    (singleHandler).OnCompleted();
+                    h.OnCompleted();
                 }
                 catch (Exception ex)
                 {
-#if UNITY_2018_3_OR_NEWER
+                    LogError(ex);
-                    UnityEngine.Debug.LogException(ex);
-#else
-                    Console.WriteLine(ex);
-#endif
                 }
+
+                preserveRemoveSelf = false;
+                iteratingNode = null;
+                var next = h.Next;
+                Remove(h);
+                h = next;
             }
 
-            if (handlers != null)
+            iteratingNode = null;
+            if (iteratingHead != null)
             {
-                for (int i = 0; i < handlers.Length; i++)
+                Add(iteratingHead);
-                {
+                iteratingHead = null;
-                    if (handlers[i] != null)
-                    {
-                        try
-                        {
-                            (handlers[i]).OnCompleted();
-                        }
-                        catch (Exception ex)
-                        {
-#if UNITY_2018_3_OR_NEWER
-                            UnityEngine.Debug.LogException(ex);
-#else
-                            Console.WriteLine(ex);
-#endif
-                            handlers[i] = null;
-                        }
-                    }
-                }
-            }
-
-            isRunning = false;
-
-            if (waitHandler != null)
-            {
-                var h = waitHandler;
-                waitHandler = null;
-                Add(h);
-            }
-
-            if (waitQueue != null)
-            {
-                while (waitQueue.Count != 0)
-                {
-                    Add(waitQueue.Dequeue());
-                }
             }
         }
 
         public void SetError(Exception exception)
         {
-            isRunning = true;
+            if (iteratingNode != null)
-
-            if (singleHandler != null)
             {
+                throw new InvalidOperationException("Can not trigger itself in iterating.");
+            }
+
+            var h = head;
+            while (h != null)
+            {
+                iteratingNode = h;
                 try
                 {
-                    singleHandler.OnError(exception);
+                    h.OnError(exception);
                 }
                 catch (Exception ex)
                 {
-#if UNITY_2018_3_OR_NEWER
+                    LogError(ex);
-                    UnityEngine.Debug.LogException(ex);
-#else
-                    Console.WriteLine(ex);
-#endif
                 }
+
+                preserveRemoveSelf = false;
+                iteratingNode = null;
+                var next = h.Next;
+                Remove(h);
+                h = next;
             }
 
-            if (handlers != null)
+            iteratingNode = null;
+            if (iteratingHead != null)
             {
-                for (int i = 0; i < handlers.Length; i++)
+                Add(iteratingHead);
-                {
+                iteratingHead = null;
-                    if (handlers[i] != null)
-                    {
-                        try
-                        {
-                            handlers[i].OnError(exception);
-                        }
-                        catch (Exception ex)
-                        {
-                            handlers[i] = null;
-#if UNITY_2018_3_OR_NEWER
-                            UnityEngine.Debug.LogException(ex);
-#else
-                            Console.WriteLine(ex);
-#endif
-                        }
-                    }
-                }
-            }
-
-            isRunning = false;
-
-            if (waitHandler != null)
-            {
-                var h = waitHandler;
-                waitHandler = null;
-                Add(h);
-            }
-
-            if (waitQueue != null)
-            {
-                while (waitQueue.Count != 0)
-                {
-                    Add(waitQueue.Dequeue());
-                }
             }
         }
 
         public void Add(ITriggerHandler<T> handler)
         {
-            if (isRunning)
+            if (handler == null) throw new ArgumentNullException(nameof(handler));
-            {
-                if (waitHandler == null)
-                {
-                    waitHandler = handler;
-                    return;
-                }
 
-                if (waitQueue == null)
+            // zero node.
-                {
+            if (head == null)
-                    waitQueue = new MinimumQueue<ITriggerHandler<T>>(4);
+            {
-                }
+                head = handler;
-                waitQueue.Enqueue(handler);
                 return;
             }
 
-            if (singleHandler == null)
+            if (iteratingNode != null)
             {
-                singleHandler = handler;
+                if (iteratingHead == null)
+                {
+                    iteratingHead = handler;
+                    return;
+                }
+
+                var last = iteratingHead.Prev;
+                if (last == null)
+                {
+                    // single node.
+                    iteratingHead.Prev = handler;
+                    iteratingHead.Next = handler;
+                    handler.Prev = iteratingHead;
+                }
+                else
+                {
+                    // multi node
+                    iteratingHead.Prev = handler;
+                    last.Next = handler;
+                    handler.Prev = last;
+                }
             }
             else
             {
-                if (handlers == null)
+                var last = head.Prev;
+                if (last == null)
                 {
-                    handlers = new ITriggerHandler<T>[4];
+                    // single node.
+                    head.Prev = handler;
+                    head.Next = handler;
+                    handler.Prev = head;
                 }
-
+                else
-                // check empty
-                for (int i = 0; i < handlers.Length; i++)
                 {
-                    if (handlers[i] == null)
+                    // multi node
-                    {
+                    head.Prev = handler;
-                        handlers[i] = handler;
+                    last.Next = handler;
-                        return;
+                    handler.Prev = last;
-                    }
-                }
-
-                // full, ensure capacity
-                var last = handlers.Length;
-                {
-                    EnsureCapacity(ref handlers);
-                    handlers[last] = handler;
                 }
             }
         }
 
-        static void EnsureCapacity(ref ITriggerHandler<T>[] array)
-        {
-            var newSize = array.Length * 2;
-            var newArray = new ITriggerHandler<T>[newSize];
-            Array.Copy(array, 0, newArray, 0, array.Length);
-            array = newArray;
-        }
-
         public void Remove(ITriggerHandler<T> handler)
         {
-            if (singleHandler == handler)
+            if (handler == null) throw new ArgumentNullException(nameof(handler));
+
+            if (iteratingNode != null && iteratingNode == handler)
             {
-                singleHandler = null;
+                // if remove self, reserve remove self after invoke completed.
+                preserveRemoveSelf = true;
             }
             else
             {
-                if (handlers != null)
+                var prev = handler.Prev;
+                var next = handler.Next;
+
+                if (next != null)
                 {
-                    for (int i = 0; i < handlers.Length; i++)
+                    next.Prev = prev;
+                }
+
+                if (handler == head)
+                {
+                    head = next;
+                }
+                else if (handler == iteratingHead)
+                {
+                    iteratingHead = next;
+                }
+                else
+                {
+                    // when handler is head, prev indicate last so don't use it.
+                    if (prev != null)
                     {
-                        if (handlers[i] == handler)
+                        prev.Next = next;
+                    }
+                }
+
+                if (head != null)
+                {
+                    if (head.Prev == handler)
+                    {
+                        if (prev != head)
                         {
-                            // fill null.
+                            head.Prev = prev;
-                            handlers[i] = null;
+                        }
-                            return;
+                        else
+                        {
+                            head.Prev = null;
                         }
                     }
                 }
+
+                if (iteratingHead != null)
+                {
+                    if (iteratingHead.Prev == handler)
+                    {
+                        if (prev != iteratingHead.Prev)
+                        {
+                            iteratingHead.Prev = prev;
+                        }
+                        else
+                        {
+                            iteratingHead.Prev = null;
+                        }
+                    }
+                }
+
+                handler.Prev = null;
+                handler.Next = null;
             }
         }
     }

src/UniTask/Assets/Plugins/UniTask/Runtime/Triggers/AsyncTriggerBase.cs

@@ -1,6 +1,5 @@
 #pragma warning disable CS1591 // Missing XML comment for publicly visible type or member
 
-using Cysharp.Threading.Tasks.Linq;
 using System;
 using System.Threading;
 using UnityEngine;
@@ -103,6 +102,8 @@ namespace Cysharp.Threading.Tasks.Triggers
             }
 
             public T Current { get; private set; }
+            ITriggerHandler<T> ITriggerHandler<T>.Prev { get; set; }
+            ITriggerHandler<T> ITriggerHandler<T>.Next { get; set; }
 
             public UniTask<bool> MoveNextAsync()
             {
@@ -189,6 +190,9 @@ namespace Cysharp.Threading.Tasks.Triggers
 
         internal CancellationToken CancellationToken => cancellationToken;
 
+        ITriggerHandler<T> ITriggerHandler<T>.Prev { get; set; }
+        ITriggerHandler<T> ITriggerHandler<T>.Next { get; set; }
+
         internal AsyncTriggerHandler(AsyncTriggerBase<T> trigger, bool callOnce)
         {
             if (cancellationToken.IsCancellationRequested)

src/UniTask/Assets/Plugins/UniTask/Runtime/Triggers/MonoBehaviourMessagesTriggers.cs

@@ -2,7 +2,9 @@
 
 using System.Threading;
 using UnityEngine;
+#if !UNITY_2019_1_OR_NEWER || UNITASK_UGUI_SUPPORT
 using UnityEngine.EventSystems;
+#endif
 
 namespace Cysharp.Threading.Tasks.Triggers
 {
@@ -715,6 +717,7 @@ namespace Cysharp.Threading.Tasks.Triggers
 #endregion
 
 #region CollisionEnter
+#if !UNITY_2019_1_OR_NEWER || UNITASK_PHYSICS_SUPPORT
 
     public interface IAsyncOnCollisionEnterHandler
     {
@@ -771,9 +774,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnCollisionEnterHandler)new AsyncTriggerHandler<Collision>(this, cancellationToken, true)).OnCollisionEnterAsync();
         }
     }
+#endif
 #endregion
 
 #region CollisionEnter2D
+#if !UNITY_2019_1_OR_NEWER || UNITASK_PHYSICS2D_SUPPORT
 
     public interface IAsyncOnCollisionEnter2DHandler
     {
@@ -830,9 +835,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnCollisionEnter2DHandler)new AsyncTriggerHandler<Collision2D>(this, cancellationToken, true)).OnCollisionEnter2DAsync();
         }
     }
+#endif
 #endregion
 
 #region CollisionExit
+#if !UNITY_2019_1_OR_NEWER || UNITASK_PHYSICS_SUPPORT
 
     public interface IAsyncOnCollisionExitHandler
     {
@@ -889,9 +896,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnCollisionExitHandler)new AsyncTriggerHandler<Collision>(this, cancellationToken, true)).OnCollisionExitAsync();
         }
     }
+#endif
 #endregion
 
 #region CollisionExit2D
+#if !UNITY_2019_1_OR_NEWER || UNITASK_PHYSICS2D_SUPPORT
 
     public interface IAsyncOnCollisionExit2DHandler
     {
@@ -948,9 +957,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnCollisionExit2DHandler)new AsyncTriggerHandler<Collision2D>(this, cancellationToken, true)).OnCollisionExit2DAsync();
         }
     }
+#endif
 #endregion
 
 #region CollisionStay
+#if !UNITY_2019_1_OR_NEWER || UNITASK_PHYSICS_SUPPORT
 
     public interface IAsyncOnCollisionStayHandler
     {
@@ -1007,9 +1018,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnCollisionStayHandler)new AsyncTriggerHandler<Collision>(this, cancellationToken, true)).OnCollisionStayAsync();
         }
     }
+#endif
 #endregion
 
 #region CollisionStay2D
+#if !UNITY_2019_1_OR_NEWER || UNITASK_PHYSICS2D_SUPPORT
 
     public interface IAsyncOnCollisionStay2DHandler
     {
@@ -1066,9 +1079,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnCollisionStay2DHandler)new AsyncTriggerHandler<Collision2D>(this, cancellationToken, true)).OnCollisionStay2DAsync();
         }
     }
+#endif
 #endregion
 
 #region ControllerColliderHit
+#if !UNITY_2019_1_OR_NEWER || UNITASK_PHYSICS_SUPPORT
 
     public interface IAsyncOnControllerColliderHitHandler
     {
@@ -1125,6 +1140,7 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnControllerColliderHitHandler)new AsyncTriggerHandler<ControllerColliderHit>(this, cancellationToken, true)).OnControllerColliderHitAsync();
         }
     }
+#endif
 #endregion
 
 #region Disable
@@ -1423,6 +1439,7 @@ namespace Cysharp.Threading.Tasks.Triggers
 #endregion
 
 #region JointBreak
+#if !UNITY_2019_1_OR_NEWER || UNITASK_PHYSICS_SUPPORT
 
     public interface IAsyncOnJointBreakHandler
     {
@@ -1479,9 +1496,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnJointBreakHandler)new AsyncTriggerHandler<float>(this, cancellationToken, true)).OnJointBreakAsync();
         }
     }
+#endif
 #endregion
 
 #region JointBreak2D
+#if !UNITY_2019_1_OR_NEWER || UNITASK_PHYSICS2D_SUPPORT
 
     public interface IAsyncOnJointBreak2DHandler
     {
@@ -1538,9 +1557,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnJointBreak2DHandler)new AsyncTriggerHandler<Joint2D>(this, cancellationToken, true)).OnJointBreak2DAsync();
         }
     }
+#endif
 #endregion
 
 #region MouseDown
+#if !(UNITY_IPHONE || UNITY_ANDROID || UNITY_METRO)
 
     public interface IAsyncOnMouseDownHandler
     {
@@ -1597,9 +1618,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnMouseDownHandler)new AsyncTriggerHandler<AsyncUnit>(this, cancellationToken, true)).OnMouseDownAsync();
         }
     }
+#endif
 #endregion
 
 #region MouseDrag
+#if !(UNITY_IPHONE || UNITY_ANDROID || UNITY_METRO)
 
     public interface IAsyncOnMouseDragHandler
     {
@@ -1656,9 +1679,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnMouseDragHandler)new AsyncTriggerHandler<AsyncUnit>(this, cancellationToken, true)).OnMouseDragAsync();
         }
     }
+#endif
 #endregion
 
 #region MouseEnter
+#if !(UNITY_IPHONE || UNITY_ANDROID || UNITY_METRO)
 
     public interface IAsyncOnMouseEnterHandler
     {
@@ -1715,9 +1740,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnMouseEnterHandler)new AsyncTriggerHandler<AsyncUnit>(this, cancellationToken, true)).OnMouseEnterAsync();
         }
     }
+#endif
 #endregion
 
 #region MouseExit
+#if !(UNITY_IPHONE || UNITY_ANDROID || UNITY_METRO)
 
     public interface IAsyncOnMouseExitHandler
     {
@@ -1774,9 +1801,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnMouseExitHandler)new AsyncTriggerHandler<AsyncUnit>(this, cancellationToken, true)).OnMouseExitAsync();
         }
     }
+#endif
 #endregion
 
 #region MouseOver
+#if !(UNITY_IPHONE || UNITY_ANDROID || UNITY_METRO)
 
     public interface IAsyncOnMouseOverHandler
     {
@@ -1833,9 +1862,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnMouseOverHandler)new AsyncTriggerHandler<AsyncUnit>(this, cancellationToken, true)).OnMouseOverAsync();
         }
     }
+#endif
 #endregion
 
 #region MouseUp
+#if !(UNITY_IPHONE || UNITY_ANDROID || UNITY_METRO)
 
     public interface IAsyncOnMouseUpHandler
     {
@@ -1892,9 +1923,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnMouseUpHandler)new AsyncTriggerHandler<AsyncUnit>(this, cancellationToken, true)).OnMouseUpAsync();
         }
     }
+#endif
 #endregion
 
 #region MouseUpAsButton
+#if !(UNITY_IPHONE || UNITY_ANDROID || UNITY_METRO)
 
     public interface IAsyncOnMouseUpAsButtonHandler
     {
@@ -1951,6 +1984,7 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnMouseUpAsButtonHandler)new AsyncTriggerHandler<AsyncUnit>(this, cancellationToken, true)).OnMouseUpAsButtonAsync();
         }
     }
+#endif
 #endregion
 
 #region ParticleCollision
@@ -2131,7 +2165,7 @@ namespace Cysharp.Threading.Tasks.Triggers
 #endregion
 
 #region ParticleUpdateJobScheduled
-#if UNITY_2019_3_OR_NEWER
+#if UNITY_2019_3_OR_NEWER && (!UNITY_2019_1_OR_NEWER || UNITASK_PARTICLESYSTEM_SUPPORT)
 
     public interface IAsyncOnParticleUpdateJobScheduledHandler
     {
@@ -2782,6 +2816,7 @@ namespace Cysharp.Threading.Tasks.Triggers
 #endregion
 
 #region TriggerEnter
+#if !UNITY_2019_1_OR_NEWER || UNITASK_PHYSICS_SUPPORT
 
     public interface IAsyncOnTriggerEnterHandler
     {
@@ -2838,9 +2873,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnTriggerEnterHandler)new AsyncTriggerHandler<Collider>(this, cancellationToken, true)).OnTriggerEnterAsync();
         }
     }
+#endif
 #endregion
 
 #region TriggerEnter2D
+#if !UNITY_2019_1_OR_NEWER || UNITASK_PHYSICS2D_SUPPORT
 
     public interface IAsyncOnTriggerEnter2DHandler
     {
@@ -2897,9 +2934,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnTriggerEnter2DHandler)new AsyncTriggerHandler<Collider2D>(this, cancellationToken, true)).OnTriggerEnter2DAsync();
         }
     }
+#endif
 #endregion
 
 #region TriggerExit
+#if !UNITY_2019_1_OR_NEWER || UNITASK_PHYSICS_SUPPORT
 
     public interface IAsyncOnTriggerExitHandler
     {
@@ -2956,9 +2995,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnTriggerExitHandler)new AsyncTriggerHandler<Collider>(this, cancellationToken, true)).OnTriggerExitAsync();
         }
     }
+#endif
 #endregion
 
 #region TriggerExit2D
+#if !UNITY_2019_1_OR_NEWER || UNITASK_PHYSICS2D_SUPPORT
 
     public interface IAsyncOnTriggerExit2DHandler
     {
@@ -3015,9 +3056,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnTriggerExit2DHandler)new AsyncTriggerHandler<Collider2D>(this, cancellationToken, true)).OnTriggerExit2DAsync();
         }
     }
+#endif
 #endregion
 
 #region TriggerStay
+#if !UNITY_2019_1_OR_NEWER || UNITASK_PHYSICS_SUPPORT
 
     public interface IAsyncOnTriggerStayHandler
     {
@@ -3074,9 +3117,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnTriggerStayHandler)new AsyncTriggerHandler<Collider>(this, cancellationToken, true)).OnTriggerStayAsync();
         }
     }
+#endif
 #endregion
 
 #region TriggerStay2D
+#if !UNITY_2019_1_OR_NEWER || UNITASK_PHYSICS2D_SUPPORT
 
     public interface IAsyncOnTriggerStay2DHandler
     {
@@ -3133,6 +3178,7 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnTriggerStay2DHandler)new AsyncTriggerHandler<Collider2D>(this, cancellationToken, true)).OnTriggerStay2DAsync();
         }
     }
+#endif
 #endregion
 
 #region Validate
@@ -3372,6 +3418,7 @@ namespace Cysharp.Threading.Tasks.Triggers
 #endregion
 
 #region BeginDrag
+#if !UNITY_2019_1_OR_NEWER || UNITASK_UGUI_SUPPORT
 
     public interface IAsyncOnBeginDragHandler
     {
@@ -3428,9 +3475,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnBeginDragHandler)new AsyncTriggerHandler<PointerEventData>(this, cancellationToken, true)).OnBeginDragAsync();
         }
     }
+#endif
 #endregion
 
 #region Cancel
+#if !UNITY_2019_1_OR_NEWER || UNITASK_UGUI_SUPPORT
 
     public interface IAsyncOnCancelHandler
     {
@@ -3487,9 +3536,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnCancelHandler)new AsyncTriggerHandler<BaseEventData>(this, cancellationToken, true)).OnCancelAsync();
         }
     }
+#endif
 #endregion
 
 #region Deselect
+#if !UNITY_2019_1_OR_NEWER || UNITASK_UGUI_SUPPORT
 
     public interface IAsyncOnDeselectHandler
     {
@@ -3546,9 +3597,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnDeselectHandler)new AsyncTriggerHandler<BaseEventData>(this, cancellationToken, true)).OnDeselectAsync();
         }
     }
+#endif
 #endregion
 
 #region Drag
+#if !UNITY_2019_1_OR_NEWER || UNITASK_UGUI_SUPPORT
 
     public interface IAsyncOnDragHandler
     {
@@ -3605,9 +3658,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnDragHandler)new AsyncTriggerHandler<PointerEventData>(this, cancellationToken, true)).OnDragAsync();
         }
     }
+#endif
 #endregion
 
 #region Drop
+#if !UNITY_2019_1_OR_NEWER || UNITASK_UGUI_SUPPORT
 
     public interface IAsyncOnDropHandler
     {
@@ -3664,9 +3719,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnDropHandler)new AsyncTriggerHandler<PointerEventData>(this, cancellationToken, true)).OnDropAsync();
         }
     }
+#endif
 #endregion
 
 #region EndDrag
+#if !UNITY_2019_1_OR_NEWER || UNITASK_UGUI_SUPPORT
 
     public interface IAsyncOnEndDragHandler
     {
@@ -3723,9 +3780,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnEndDragHandler)new AsyncTriggerHandler<PointerEventData>(this, cancellationToken, true)).OnEndDragAsync();
         }
     }
+#endif
 #endregion
 
 #region InitializePotentialDrag
+#if !UNITY_2019_1_OR_NEWER || UNITASK_UGUI_SUPPORT
 
     public interface IAsyncOnInitializePotentialDragHandler
     {
@@ -3782,9 +3841,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnInitializePotentialDragHandler)new AsyncTriggerHandler<PointerEventData>(this, cancellationToken, true)).OnInitializePotentialDragAsync();
         }
     }
+#endif
 #endregion
 
 #region Move
+#if !UNITY_2019_1_OR_NEWER || UNITASK_UGUI_SUPPORT
 
     public interface IAsyncOnMoveHandler
     {
@@ -3841,9 +3902,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnMoveHandler)new AsyncTriggerHandler<AxisEventData>(this, cancellationToken, true)).OnMoveAsync();
         }
     }
+#endif
 #endregion
 
 #region PointerClick
+#if !UNITY_2019_1_OR_NEWER || UNITASK_UGUI_SUPPORT
 
     public interface IAsyncOnPointerClickHandler
     {
@@ -3900,9 +3963,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnPointerClickHandler)new AsyncTriggerHandler<PointerEventData>(this, cancellationToken, true)).OnPointerClickAsync();
         }
     }
+#endif
 #endregion
 
 #region PointerDown
+#if !UNITY_2019_1_OR_NEWER || UNITASK_UGUI_SUPPORT
 
     public interface IAsyncOnPointerDownHandler
     {
@@ -3959,9 +4024,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnPointerDownHandler)new AsyncTriggerHandler<PointerEventData>(this, cancellationToken, true)).OnPointerDownAsync();
         }
     }
+#endif
 #endregion
 
 #region PointerEnter
+#if !UNITY_2019_1_OR_NEWER || UNITASK_UGUI_SUPPORT
 
     public interface IAsyncOnPointerEnterHandler
     {
@@ -4018,9 +4085,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnPointerEnterHandler)new AsyncTriggerHandler<PointerEventData>(this, cancellationToken, true)).OnPointerEnterAsync();
         }
     }
+#endif
 #endregion
 
 #region PointerExit
+#if !UNITY_2019_1_OR_NEWER || UNITASK_UGUI_SUPPORT
 
     public interface IAsyncOnPointerExitHandler
     {
@@ -4077,9 +4146,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnPointerExitHandler)new AsyncTriggerHandler<PointerEventData>(this, cancellationToken, true)).OnPointerExitAsync();
         }
     }
+#endif
 #endregion
 
 #region PointerUp
+#if !UNITY_2019_1_OR_NEWER || UNITASK_UGUI_SUPPORT
 
     public interface IAsyncOnPointerUpHandler
     {
@@ -4136,9 +4207,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnPointerUpHandler)new AsyncTriggerHandler<PointerEventData>(this, cancellationToken, true)).OnPointerUpAsync();
         }
     }
+#endif
 #endregion
 
 #region Scroll
+#if !UNITY_2019_1_OR_NEWER || UNITASK_UGUI_SUPPORT
 
     public interface IAsyncOnScrollHandler
     {
@@ -4195,9 +4268,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnScrollHandler)new AsyncTriggerHandler<PointerEventData>(this, cancellationToken, true)).OnScrollAsync();
         }
     }
+#endif
 #endregion
 
 #region Select
+#if !UNITY_2019_1_OR_NEWER || UNITASK_UGUI_SUPPORT
 
     public interface IAsyncOnSelectHandler
     {
@@ -4254,9 +4329,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnSelectHandler)new AsyncTriggerHandler<BaseEventData>(this, cancellationToken, true)).OnSelectAsync();
         }
     }
+#endif
 #endregion
 
 #region Submit
+#if !UNITY_2019_1_OR_NEWER || UNITASK_UGUI_SUPPORT
 
     public interface IAsyncOnSubmitHandler
     {
@@ -4313,9 +4390,11 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnSubmitHandler)new AsyncTriggerHandler<BaseEventData>(this, cancellationToken, true)).OnSubmitAsync();
         }
     }
+#endif
 #endregion
 
 #region UpdateSelected
+#if !UNITY_2019_1_OR_NEWER || UNITASK_UGUI_SUPPORT
 
     public interface IAsyncOnUpdateSelectedHandler
     {
@@ -4372,6 +4451,7 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((IAsyncOnUpdateSelectedHandler)new AsyncTriggerHandler<BaseEventData>(this, cancellationToken, true)).OnUpdateSelectedAsync();
         }
     }
+#endif
 #endregion
 
 }

src/UniTask/Assets/Plugins/UniTask/Runtime/Triggers/MonoBehaviourMessagesTriggers.tt

@@ -25,13 +25,7 @@
         ("Update", "Update", "AsyncUnit", null, empty),
         ("FixedUpdate", "FixedUpdate", "AsyncUnit", null, empty),
         ("LateUpdate", "LateUpdate", "AsyncUnit", null, empty),
-        ("MouseDown", "OnMouseDown", "AsyncUnit", null, empty),
+        
-        ("MouseDrag", "OnMouseDrag", "AsyncUnit", null, empty),
-        ("MouseEnter", "OnMouseEnter", "AsyncUnit", null, empty),
-        ("MouseExit", "OnMouseExit", "AsyncUnit", null, empty),
-        ("MouseOver", "OnMouseOver", "AsyncUnit", null, empty),
-        ("MouseUp", "OnMouseUp", "AsyncUnit", null, empty),
-        ("MouseUpAsButton", "OnMouseUpAsButton", "AsyncUnit", null, empty),
         ("ParticleCollision", "OnParticleCollision", "GameObject", null, new []{ ("GameObject", "other") }),
         ("RectTransformDimensionsChange", "OnRectTransformDimensionsChange", "AsyncUnit", null, empty),
         ("RectTransformRemoved", "OnRectTransformRemoved", "AsyncUnit", null, empty),
@@ -47,6 +41,15 @@
         ("BecameInvisible", "OnBecameInvisible", "AsyncUnit", null, empty),
         ("BecameVisible", "OnBecameVisible", "AsyncUnit", null, empty),
         
+        // Mouse... #if !(UNITY_IPHONE || UNITY_ANDROID || UNITY_METRO)
+        ("MouseDown", "OnMouseDown", "AsyncUnit", null, empty),
+        ("MouseDrag", "OnMouseDrag", "AsyncUnit", null, empty),
+        ("MouseEnter", "OnMouseEnter", "AsyncUnit", null, empty),
+        ("MouseExit", "OnMouseExit", "AsyncUnit", null, empty),
+        ("MouseOver", "OnMouseOver", "AsyncUnit", null, empty),
+        ("MouseUp", "OnMouseUp", "AsyncUnit", null, empty),
+        ("MouseUpAsButton", "OnMouseUpAsButton", "AsyncUnit", null, empty),
+
         // new in v2
         ("ApplicationFocus", "OnApplicationFocus", "bool", null, new []{("bool", "hasFocus") }),
         ("ApplicationPause", "OnApplicationPause", "bool", null, new []{("bool", "pauseStatus") }),
@@ -103,20 +106,36 @@
     Func<(string argType, string argName)[], string> BuildMethodArgument = x => string.Join(", ", x.Select(y => y.argType + " " + y.argName));
     Func<(string argType, string argName)[], string> BuildResultParameter = x => x.Length == 0 ? "AsyncUnit.Default" : "(" + string.Join(", ", x.Select(y => y.argName)) + ")";
 
-    Func<string, bool> Is2019_3 = x => x == "ParticleUpdateJobScheduled";
+    Func<string, bool> IsParticleSystem = x => x == "ParticleUpdateJobScheduled";
+    Func<string, bool> IsMouseTrigger = x => x.StartsWith("Mouse");
+    Func<string, string> RequirePhysicsModule = x => (x.StartsWith("Collision") || x.StartsWith("Collider") || x.StartsWith("ControllerCollider") || x.StartsWith("Joint") || x.StartsWith("Trigger"))
+        ? (x.Contains("2D") ? "UNITASK_PHYSICS2D_SUPPORT" : "UNITASK_PHYSICS_SUPPORT") 
+        : null;
+    Func<string, bool> IsUguiSystem = x => x != null;
 #>
 #pragma warning disable CS1591 // Missing XML comment for publicly visible type or member
 
 using System.Threading;
 using UnityEngine;
+#if !UNITY_2019_1_OR_NEWER || UNITASK_UGUI_SUPPORT
 using UnityEngine.EventSystems;
+#endif
 
 namespace Cysharp.Threading.Tasks.Triggers
 {
 <# foreach(var t in triggers) { #>
 #region <#= t.triggerName #>
-<# if(Is2019_3(t.triggerName)) { #>
+<# if(IsUguiSystem(t.handlerInterface)) { #>
-#if UNITY_2019_3_OR_NEWER
+#if !UNITY_2019_1_OR_NEWER || UNITASK_UGUI_SUPPORT
+<# } #>
+<# if(IsParticleSystem(t.triggerName)) { #>
+#if UNITY_2019_3_OR_NEWER && (!UNITY_2019_1_OR_NEWER || UNITASK_PARTICLESYSTEM_SUPPORT)
+<# } #>
+<# if(IsMouseTrigger(t.triggerName)) { #>
+#if !(UNITY_IPHONE || UNITY_ANDROID || UNITY_METRO)
+<# } #>
+<# if(RequirePhysicsModule(t.triggerName) != null) { #>
+#if !UNITY_2019_1_OR_NEWER || <#= RequirePhysicsModule(t.triggerName) #>
 <# } #>
 
     public interface <#= ToInterfaceName(t.methodName) #>
@@ -174,7 +193,13 @@ namespace Cysharp.Threading.Tasks.Triggers
             return ((<#= ToInterfaceName(t.methodName) #>)new AsyncTriggerHandler<<#= t.returnType #>>(this, cancellationToken, true)).<#= t.methodName #>Async();
         }
     }
-<# if(Is2019_3(t.triggerName)) { #>
+<# if(IsUguiSystem(t.handlerInterface)) { #>
+#endif
+<# } #>
+<# if(RequirePhysicsModule(t.triggerName) != null) { #>
+#endif
+<# } #>
+<# if(IsParticleSystem(t.triggerName) || IsMouseTrigger(t.triggerName)) { #>
 #endif
 <# } #>
 #endregion

src/UniTask/Assets/Plugins/UniTask/Runtime/UniTask.Delay.cs

@@ -1,13 +1,23 @@
 #pragma warning disable CS1591 // Missing XML comment for publicly visible type or member
 
+using Cysharp.Threading.Tasks.Internal;
 using System;
 using System.Runtime.CompilerServices;
 using System.Threading;
-using Cysharp.Threading.Tasks.Internal;
 using UnityEngine;
 
 namespace Cysharp.Threading.Tasks
 {
+    public enum DelayType
+    {
+        /// <summary>use Time.deltaTime.</summary>
+        DeltaTime,
+        /// <summary>Ignore timescale, use Time.unscaledDeltaTime.</summary>
+        UnscaledDeltaTime,
+        /// <summary>use Stopwatch.GetTimestamp().</summary>
+        Realtime
+    }
+
     public partial struct UniTask
     {
         public static YieldAwaitable Yield(PlayerLoopTiming timing = PlayerLoopTiming.Update)
@@ -21,6 +31,46 @@ namespace Cysharp.Threading.Tasks
             return new UniTask(YieldPromise.Create(timing, cancellationToken, out var token), token);
         }
 
+        /// <summary>
+        /// Similar as UniTask.Yield but guaranteed run on next frame.
+        /// </summary>
+        public static UniTask NextFrame(PlayerLoopTiming timing = PlayerLoopTiming.Update, CancellationToken cancellationToken = default)
+        {
+            return new UniTask(NextFramePromise.Create(timing, cancellationToken, out var token), token);
+        }
+
+        /// <summary>
+        /// Same as UniTask.Yield(PlayerLoopTiming.LastPostLateUpdate).
+        /// </summary>
+        public static YieldAwaitable WaitForEndOfFrame()
+        {
+            return UniTask.Yield(PlayerLoopTiming.LastPostLateUpdate);
+        }
+
+        /// <summary>
+        /// Same as UniTask.Yield(PlayerLoopTiming.LastPostLateUpdate, cancellationToken).
+        /// </summary>
+        public static UniTask WaitForEndOfFrame(CancellationToken cancellationToken)
+        {
+            return UniTask.Yield(PlayerLoopTiming.LastPostLateUpdate, cancellationToken);
+        }
+
+        /// <summary>
+        /// Same as UniTask.Yield(PlayerLoopTiming.FixedUpdate).
+        /// </summary>
+        public static YieldAwaitable WaitForFixedUpdate()
+        {
+            return UniTask.Yield(PlayerLoopTiming.FixedUpdate);
+        }
+
+        /// <summary>
+        /// Same as UniTask.Yield(PlayerLoopTiming.FixedUpdate, cancellationToken).
+        /// </summary>
+        public static UniTask WaitForFixedUpdate(CancellationToken cancellationToken)
+        {
+            return UniTask.Yield(PlayerLoopTiming.FixedUpdate, cancellationToken);
+        }
+
         public static UniTask DelayFrame(int delayFrameCount, PlayerLoopTiming delayTiming = PlayerLoopTiming.Update, CancellationToken cancellationToken = default(CancellationToken))
         {
             if (delayFrameCount < 0)
@@ -34,36 +84,55 @@ namespace Cysharp.Threading.Tasks
         public static UniTask Delay(int millisecondsDelay, bool ignoreTimeScale = false, PlayerLoopTiming delayTiming = PlayerLoopTiming.Update, CancellationToken cancellationToken = default(CancellationToken))
         {
             var delayTimeSpan = TimeSpan.FromMilliseconds(millisecondsDelay);
-            if (delayTimeSpan < TimeSpan.Zero)
+            return Delay(delayTimeSpan, ignoreTimeScale, delayTiming, cancellationToken);
-            {
-                throw new ArgumentOutOfRangeException("Delay does not allow minus millisecondsDelay. millisecondsDelay:" + millisecondsDelay);
-            }
-
-            return (ignoreTimeScale)
-                ? new UniTask(DelayIgnoreTimeScalePromise.Create(delayTimeSpan, delayTiming, cancellationToken, out var token), token)
-                : new UniTask(DelayPromise.Create(delayTimeSpan, delayTiming, cancellationToken, out token), token);
         }
 
         public static UniTask Delay(TimeSpan delayTimeSpan, bool ignoreTimeScale = false, PlayerLoopTiming delayTiming = PlayerLoopTiming.Update, CancellationToken cancellationToken = default(CancellationToken))
+        {
+            var delayType = ignoreTimeScale ? DelayType.UnscaledDeltaTime : DelayType.DeltaTime;
+            return Delay(delayTimeSpan, delayType, delayTiming, cancellationToken);
+        }
+
+        public static UniTask Delay(int millisecondsDelay, DelayType delayType, PlayerLoopTiming delayTiming = PlayerLoopTiming.Update, CancellationToken cancellationToken = default(CancellationToken))
+        {
+            var delayTimeSpan = TimeSpan.FromMilliseconds(millisecondsDelay);
+            return Delay(delayTimeSpan, delayType, delayTiming, cancellationToken);
+        }
+
+        public static UniTask Delay(TimeSpan delayTimeSpan, DelayType delayType, PlayerLoopTiming delayTiming = PlayerLoopTiming.Update, CancellationToken cancellationToken = default(CancellationToken))
         {
             if (delayTimeSpan < TimeSpan.Zero)
             {
                 throw new ArgumentOutOfRangeException("Delay does not allow minus delayTimeSpan. delayTimeSpan:" + delayTimeSpan);
             }
 
-            return (ignoreTimeScale)
+            switch (delayType)
-                ? new UniTask(DelayIgnoreTimeScalePromise.Create(delayTimeSpan, delayTiming, cancellationToken, out var token), token)
+            {
-                : new UniTask(DelayPromise.Create(delayTimeSpan, delayTiming, cancellationToken, out token), token);
+                case DelayType.UnscaledDeltaTime:
+                    {
+                        return new UniTask(DelayIgnoreTimeScalePromise.Create(delayTimeSpan, delayTiming, cancellationToken, out var token), token);
+                    }
+                case DelayType.Realtime:
+                    {
+                        return new UniTask(DelayRealtimePromise.Create(delayTimeSpan, delayTiming, cancellationToken, out var token), token);
+                    }
+                case DelayType.DeltaTime:
+                default:
+                    {
+                        return new UniTask(DelayPromise.Create(delayTimeSpan, delayTiming, cancellationToken, out var token), token);
+                    }
+            }
         }
 
         sealed class YieldPromise : IUniTaskSource, IPlayerLoopItem, ITaskPoolNode<YieldPromise>
         {
             static TaskPool<YieldPromise> pool;
-            public YieldPromise NextNode { get; set; }
+            YieldPromise nextNode;
+            public ref YieldPromise NextNode => ref nextNode;
 
             static YieldPromise()
             {
-                TaskPoolMonitor.RegisterSizeGetter(typeof(YieldPromise), () => pool.Size);
+                TaskPool.RegisterSizeGetter(typeof(YieldPromise), () => pool.Size);
             }
 
             CancellationToken cancellationToken;
@@ -142,31 +211,120 @@ namespace Cysharp.Threading.Tasks
                 cancellationToken = default;
                 return pool.TryPush(this);
             }
+        }
 
-            ~YieldPromise()
+        sealed class NextFramePromise : IUniTaskSource, IPlayerLoopItem, ITaskPoolNode<NextFramePromise>
+        {
+            static TaskPool<NextFramePromise> pool;
+            NextFramePromise nextNode;
+            public ref NextFramePromise NextNode => ref nextNode;
+
+            static NextFramePromise()
             {
-                if (TryReturn())
+                TaskPool.RegisterSizeGetter(typeof(NextFramePromise), () => pool.Size);
+            }
+
+            int frameCount;
+            CancellationToken cancellationToken;
+            UniTaskCompletionSourceCore<AsyncUnit> core;
+
+            NextFramePromise()
+            {
+            }
+
+            public static IUniTaskSource Create(PlayerLoopTiming timing, CancellationToken cancellationToken, out short token)
+            {
+                if (cancellationToken.IsCancellationRequested)
                 {
-                    GC.ReRegisterForFinalize(this);
+                    return AutoResetUniTaskCompletionSource.CreateFromCanceled(cancellationToken, out token);
                 }
+
+                if (!pool.TryPop(out var result))
+                {
+                    result = new NextFramePromise();
+                }
+
+                result.frameCount = PlayerLoopHelper.IsMainThread ? Time.frameCount : -1;
+                result.cancellationToken = cancellationToken;
+
+                TaskTracker.TrackActiveTask(result, 3);
+
+                PlayerLoopHelper.AddAction(timing, result);
+
+                token = result.core.Version;
+                return result;
+            }
+
+            public void GetResult(short token)
+            {
+                try
+                {
+                    core.GetResult(token);
+                }
+                finally
+                {
+                    TryReturn();
+                }
+            }
+
+            public UniTaskStatus GetStatus(short token)
+            {
+                return core.GetStatus(token);
+            }
+
+            public UniTaskStatus UnsafeGetStatus()
+            {
+                return core.UnsafeGetStatus();
+            }
+
+            public void OnCompleted(Action<object> continuation, object state, short token)
+            {
+                core.OnCompleted(continuation, state, token);
+            }
+
+            public bool MoveNext()
+            {
+                if (cancellationToken.IsCancellationRequested)
+                {
+                    core.TrySetCanceled(cancellationToken);
+                    return false;
+                }
+
+                if (frameCount == Time.frameCount)
+                {
+                    return true;
+                }
+
+                core.TrySetResult(AsyncUnit.Default);
+                return false;
+            }
+
+            bool TryReturn()
+            {
+                TaskTracker.RemoveTracking(this);
+                core.Reset();
+                cancellationToken = default;
+                return pool.TryPush(this);
             }
         }
 
         sealed class DelayFramePromise : IUniTaskSource, IPlayerLoopItem, ITaskPoolNode<DelayFramePromise>
         {
             static TaskPool<DelayFramePromise> pool;
-            public DelayFramePromise NextNode { get; set; }
+            DelayFramePromise nextNode;
+            public ref DelayFramePromise NextNode => ref nextNode;
 
             static DelayFramePromise()
             {
-                TaskPoolMonitor.RegisterSizeGetter(typeof(DelayFramePromise), () => pool.Size);
+                TaskPool.RegisterSizeGetter(typeof(DelayFramePromise), () => pool.Size);
             }
 
+            int initialFrame;
             int delayFrameCount;
             CancellationToken cancellationToken;
 
             int currentFrameCount;
-            UniTaskCompletionSourceCore<object> core;
+            UniTaskCompletionSourceCore<AsyncUnit> core;
 
             DelayFramePromise()
             {
@@ -186,6 +344,7 @@ namespace Cysharp.Threading.Tasks
 
                 result.delayFrameCount = delayFrameCount;
                 result.cancellationToken = cancellationToken;
+                result.initialFrame = PlayerLoopHelper.IsMainThread ? Time.frameCount : -1;
 
                 TaskTracker.TrackActiveTask(result, 3);
 
@@ -230,13 +389,27 @@ namespace Cysharp.Threading.Tasks
                     return false;
                 }
 
-                if (currentFrameCount == delayFrameCount)
+                if (currentFrameCount == 0)
                 {
-                    core.TrySetResult(null);
+                    if (delayFrameCount == 0) // same as Yield
+                    {
+                        core.TrySetResult(AsyncUnit.Default);
+                        return false;
+                    }
+
+                    // skip in initial frame.
+                    if (initialFrame == Time.frameCount)
+                    {
+                        return true;
+                    }
+                }
+
+                if (++currentFrameCount >= delayFrameCount)
+                {
+                    core.TrySetResult(AsyncUnit.Default);
                     return false;
                 }
 
-                currentFrameCount++;
                 return true;
             }
 
@@ -249,27 +422,21 @@ namespace Cysharp.Threading.Tasks
                 cancellationToken = default;
                 return pool.TryPush(this);
             }
-
-            ~DelayFramePromise()
-            {
-                if (TryReturn())
-                {
-                    GC.ReRegisterForFinalize(this);
-                }
-            }
         }
 
         sealed class DelayPromise : IUniTaskSource, IPlayerLoopItem, ITaskPoolNode<DelayPromise>
         {
             static TaskPool<DelayPromise> pool;
-            public DelayPromise NextNode { get; set; }
+            DelayPromise nextNode;
+            public ref DelayPromise NextNode => ref nextNode;
 
             static DelayPromise()
             {
-                TaskPoolMonitor.RegisterSizeGetter(typeof(DelayPromise), () => pool.Size);
+                TaskPool.RegisterSizeGetter(typeof(DelayPromise), () => pool.Size);
             }
 
-            float delayFrameTimeSpan;
+            int initialFrame;
+            float delayTimeSpan;
             float elapsed;
             CancellationToken cancellationToken;
 
@@ -279,7 +446,7 @@ namespace Cysharp.Threading.Tasks
             {
             }
 
-            public static IUniTaskSource Create(TimeSpan delayFrameTimeSpan, PlayerLoopTiming timing, CancellationToken cancellationToken, out short token)
+            public static IUniTaskSource Create(TimeSpan delayTimeSpan, PlayerLoopTiming timing, CancellationToken cancellationToken, out short token)
             {
                 if (cancellationToken.IsCancellationRequested)
                 {
@@ -292,8 +459,9 @@ namespace Cysharp.Threading.Tasks
                 }
 
                 result.elapsed = 0.0f;
-                result.delayFrameTimeSpan = (float)delayFrameTimeSpan.TotalSeconds;
+                result.delayTimeSpan = (float)delayTimeSpan.TotalSeconds;
                 result.cancellationToken = cancellationToken;
+                result.initialFrame = PlayerLoopHelper.IsMainThread ? Time.frameCount : -1;
 
                 TaskTracker.TrackActiveTask(result, 3);
 
@@ -338,8 +506,16 @@ namespace Cysharp.Threading.Tasks
                     return false;
                 }
 
+                if (elapsed == 0.0f)
+                {
+                    if (initialFrame == Time.frameCount)
+                    {
+                        return true;
+                    }
+                }
+
                 elapsed += Time.deltaTime;
-                if (elapsed >= delayFrameTimeSpan)
+                if (elapsed >= delayTimeSpan)
                 {
                     core.TrySetResult(null);
                     return false;
@@ -352,33 +528,27 @@ namespace Cysharp.Threading.Tasks
             {
                 TaskTracker.RemoveTracking(this);
                 core.Reset();
-                delayFrameTimeSpan = default;
+                delayTimeSpan = default;
                 elapsed = default;
                 cancellationToken = default;
                 return pool.TryPush(this);
             }
-
-            ~DelayPromise()
-            {
-                if (TryReturn())
-                {
-                    GC.ReRegisterForFinalize(this);
-                }
-            }
         }
 
         sealed class DelayIgnoreTimeScalePromise : IUniTaskSource, IPlayerLoopItem, ITaskPoolNode<DelayIgnoreTimeScalePromise>
         {
             static TaskPool<DelayIgnoreTimeScalePromise> pool;
-            public DelayIgnoreTimeScalePromise NextNode { get; set; }
+            DelayIgnoreTimeScalePromise nextNode;
+            public ref DelayIgnoreTimeScalePromise NextNode => ref nextNode;
 
             static DelayIgnoreTimeScalePromise()
             {
-                TaskPoolMonitor.RegisterSizeGetter(typeof(DelayIgnoreTimeScalePromise), () => pool.Size);
+                TaskPool.RegisterSizeGetter(typeof(DelayIgnoreTimeScalePromise), () => pool.Size);
             }
 
             float delayFrameTimeSpan;
             float elapsed;
+            int initialFrame;
             CancellationToken cancellationToken;
 
             UniTaskCompletionSourceCore<object> core;
@@ -401,6 +571,7 @@ namespace Cysharp.Threading.Tasks
 
                 result.elapsed = 0.0f;
                 result.delayFrameTimeSpan = (float)delayFrameTimeSpan.TotalSeconds;
+                result.initialFrame = PlayerLoopHelper.IsMainThread ? Time.frameCount : -1;
                 result.cancellationToken = cancellationToken;
 
                 TaskTracker.TrackActiveTask(result, 3);
@@ -446,6 +617,14 @@ namespace Cysharp.Threading.Tasks
                     return false;
                 }
 
+                if (elapsed == 0.0f)
+                {
+                    if (initialFrame == Time.frameCount)
+                    {
+                        return true;
+                    }
+                }
+
                 elapsed += Time.unscaledDeltaTime;
                 if (elapsed >= delayFrameTimeSpan)
                 {
@@ -465,13 +644,110 @@ namespace Cysharp.Threading.Tasks
                 cancellationToken = default;
                 return pool.TryPush(this);
             }
+        }
 
-            ~DelayIgnoreTimeScalePromise()
+        sealed class DelayRealtimePromise : IUniTaskSource, IPlayerLoopItem, ITaskPoolNode<DelayRealtimePromise>
+        {
+            static TaskPool<DelayRealtimePromise> pool;
+            DelayRealtimePromise nextNode;
+            public ref DelayRealtimePromise NextNode => ref nextNode;
+
+            static DelayRealtimePromise()
             {
-                if (TryReturn())
+                TaskPool.RegisterSizeGetter(typeof(DelayRealtimePromise), () => pool.Size);
+            }
+
+            long delayTimeSpanTicks;
+            ValueStopwatch stopwatch;
+            CancellationToken cancellationToken;
+
+            UniTaskCompletionSourceCore<AsyncUnit> core;
+
+            DelayRealtimePromise()
+            {
+            }
+
+            public static IUniTaskSource Create(TimeSpan delayTimeSpan, PlayerLoopTiming timing, CancellationToken cancellationToken, out short token)
+            {
+                if (cancellationToken.IsCancellationRequested)
                 {
-                    GC.ReRegisterForFinalize(this);
+                    return AutoResetUniTaskCompletionSource.CreateFromCanceled(cancellationToken, out token);
                 }
+
+                if (!pool.TryPop(out var result))
+                {
+                    result = new DelayRealtimePromise();
+                }
+
+                result.stopwatch = ValueStopwatch.StartNew();
+                result.delayTimeSpanTicks = delayTimeSpan.Ticks;
+                result.cancellationToken = cancellationToken;
+
+                TaskTracker.TrackActiveTask(result, 3);
+
+                PlayerLoopHelper.AddAction(timing, result);
+
+                token = result.core.Version;
+                return result;
+            }
+
+            public void GetResult(short token)
+            {
+                try
+                {
+                    core.GetResult(token);
+                }
+                finally
+                {
+                    TryReturn();
+                }
+            }
+
+            public UniTaskStatus GetStatus(short token)
+            {
+                return core.GetStatus(token);
+            }
+
+            public UniTaskStatus UnsafeGetStatus()
+            {
+                return core.UnsafeGetStatus();
+            }
+
+            public void OnCompleted(Action<object> continuation, object state, short token)
+            {
+                core.OnCompleted(continuation, state, token);
+            }
+
+            public bool MoveNext()
+            {
+                if (cancellationToken.IsCancellationRequested)
+                {
+                    core.TrySetCanceled(cancellationToken);
+                    return false;
+                }
+
+                if (stopwatch.IsInvalid)
+                {
+                    core.TrySetResult(AsyncUnit.Default);
+                    return false;
+                }
+
+                if (stopwatch.ElapsedTicks >= delayTimeSpanTicks)
+                {
+                    core.TrySetResult(AsyncUnit.Default);
+                    return false;
+                }
+
+                return true;
+            }
+
+            bool TryReturn()
+            {
+                TaskTracker.RemoveTracking(this);
+                core.Reset();
+                stopwatch = default;
+                cancellationToken = default;
+                return pool.TryPush(this);
             }
         }
     }

src/UniTask/Assets/Plugins/UniTask/Runtime/UniTask.Factory.cs

@@ -1,6 +1,9 @@
 #pragma warning disable CS1591 // Missing XML comment for publicly visible type or member
 
+using Cysharp.Threading.Tasks.Internal;
 using System;
+using System.Runtime.CompilerServices;
+using System.Runtime.ExceptionServices;
 using System.Threading;
 
 namespace Cysharp.Threading.Tasks
@@ -9,10 +12,7 @@ namespace Cysharp.Threading.Tasks
     {
         static readonly UniTask CanceledUniTask = new Func<UniTask>(() =>
         {
-            var promise = new UniTaskCompletionSource();
+            return new UniTask(new CanceledResultSource(CancellationToken.None), 0);
-            promise.TrySetCanceled(CancellationToken.None);
-            promise.MarkHandled();
-            return promise.Task;
         })();
 
         static class CanceledUniTaskCache<T>
@@ -21,10 +21,7 @@ namespace Cysharp.Threading.Tasks
 
             static CanceledUniTaskCache()
             {
-                var promise = new UniTaskCompletionSource<T>();
+                Task = new UniTask<T>(new CanceledResultSource<T>(CancellationToken.None), 0);
-                promise.TrySetCanceled(CancellationToken.None);
-                promise.MarkHandled();
-                Task = promise.Task;
             }
         }
 
@@ -32,18 +29,22 @@ namespace Cysharp.Threading.Tasks
 
         public static UniTask FromException(Exception ex)
         {
-            var promise = new UniTaskCompletionSource();
+            if (ex is OperationCanceledException oce)
-            promise.TrySetException(ex);
+            {
-            promise.MarkHandled();
+                return FromCanceled(oce.CancellationToken);
-            return promise.Task;
+            }
+
+            return new UniTask(new ExceptionResultSource(ex), 0);
         }
 
         public static UniTask<T> FromException<T>(Exception ex)
         {
-            var promise = new UniTaskCompletionSource<T>();
+            if (ex is OperationCanceledException oce)
-            promise.TrySetException(ex);
+            {
-            promise.MarkHandled();
+                return FromCanceled<T>(oce.CancellationToken);
-            return promise.Task;
+            }
+
+            return new UniTask<T>(new ExceptionResultSource<T>(ex), 0);
         }
 
         public static UniTask<T> FromResult<T>(T value)
@@ -59,10 +60,7 @@ namespace Cysharp.Threading.Tasks
             }
             else
             {
-                var promise = new UniTaskCompletionSource();
+                return new UniTask(new CanceledResultSource(cancellationToken), 0);
-                promise.TrySetCanceled(cancellationToken);
-                promise.MarkHandled();
-                return promise.Task;
             }
         }
 
@@ -74,10 +72,7 @@ namespace Cysharp.Threading.Tasks
             }
             else
             {
-                var promise = new UniTaskCompletionSource<T>();
+                return new UniTask<T>(new CanceledResultSource<T>(cancellationToken), 0);
-                promise.TrySetCanceled(cancellationToken);
-                promise.MarkHandled();
-                return promise.Task;
             }
         }
 
@@ -102,8 +97,7 @@ namespace Cysharp.Threading.Tasks
         }
 
         /// <summary>
-        /// helper of create add UniTaskVoid to delegate.
+        /// helper of fire and forget void action.
-        /// For example: FooEvent += () => UniTask.Void(async () => { /* */ })
         /// </summary>
         public static void Void(Func<UniTaskVoid> asyncAction)
         {
@@ -111,7 +105,7 @@ namespace Cysharp.Threading.Tasks
         }
 
         /// <summary>
-        /// helper of create add UniTaskVoid to delegate.
+        /// helper of fire and forget void action.
         /// </summary>
         public static void Void(Func<CancellationToken, UniTaskVoid> asyncAction, CancellationToken cancellationToken)
         {
@@ -119,8 +113,7 @@ namespace Cysharp.Threading.Tasks
         }
 
         /// <summary>
-        /// helper of create add UniTaskVoid to delegate.
+        /// helper of fire and forget void action.
-        /// For example: FooEvent += (sender, e) => UniTask.Void(async arg => { /* */ }, (sender, e))
         /// </summary>
         public static void Void<T>(Func<T, UniTaskVoid> asyncAction, T state)
         {
@@ -182,6 +175,153 @@ namespace Cysharp.Threading.Tasks
             return new UniTask<T>(new DeferPromise<T>(factory), 0);
         }
 
+        /// <summary>
+        /// Never complete.
+        /// </summary>
+        public static UniTask Never(CancellationToken cancellationToken)
+        {
+            return new UniTask<AsyncUnit>(new NeverPromise<AsyncUnit>(cancellationToken), 0);
+        }
+
+        /// <summary>
+        /// Never complete.
+        /// </summary>
+        public static UniTask<T> Never<T>(CancellationToken cancellationToken)
+        {
+            return new UniTask<T>(new NeverPromise<T>(cancellationToken), 0);
+        }
+
+        sealed class ExceptionResultSource : IUniTaskSource
+        {
+            readonly ExceptionDispatchInfo exception;
+
+            public ExceptionResultSource(Exception exception)
+            {
+                this.exception = ExceptionDispatchInfo.Capture(exception);
+            }
+
+            public void GetResult(short token)
+            {
+                exception.Throw();
+            }
+
+            public UniTaskStatus GetStatus(short token)
+            {
+                return UniTaskStatus.Faulted;
+            }
+
+            public UniTaskStatus UnsafeGetStatus()
+            {
+                return UniTaskStatus.Faulted;
+            }
+
+            public void OnCompleted(Action<object> continuation, object state, short token)
+            {
+                continuation(state);
+            }
+        }
+
+        sealed class ExceptionResultSource<T> : IUniTaskSource<T>
+        {
+            readonly ExceptionDispatchInfo exception;
+
+            public ExceptionResultSource(Exception exception)
+            {
+                this.exception = ExceptionDispatchInfo.Capture(exception);
+            }
+
+            public T GetResult(short token)
+            {
+                exception.Throw();
+                return default;
+            }
+
+            void IUniTaskSource.GetResult(short token)
+            {
+                exception.Throw();
+            }
+
+            public UniTaskStatus GetStatus(short token)
+            {
+                return UniTaskStatus.Faulted;
+            }
+
+            public UniTaskStatus UnsafeGetStatus()
+            {
+                return UniTaskStatus.Faulted;
+            }
+
+            public void OnCompleted(Action<object> continuation, object state, short token)
+            {
+                continuation(state);
+            }
+        }
+
+        sealed class CanceledResultSource : IUniTaskSource
+        {
+            readonly CancellationToken cancellationToken;
+
+            public CanceledResultSource(CancellationToken cancellationToken)
+            {
+                this.cancellationToken = cancellationToken;
+            }
+
+            public void GetResult(short token)
+            {
+                throw new OperationCanceledException(cancellationToken);
+            }
+
+            public UniTaskStatus GetStatus(short token)
+            {
+                return UniTaskStatus.Canceled;
+            }
+
+            public UniTaskStatus UnsafeGetStatus()
+            {
+                return UniTaskStatus.Canceled;
+            }
+
+            public void OnCompleted(Action<object> continuation, object state, short token)
+            {
+                continuation(state);
+            }
+        }
+
+        sealed class CanceledResultSource<T> : IUniTaskSource<T>
+        {
+            readonly CancellationToken cancellationToken;
+
+            public CanceledResultSource(CancellationToken cancellationToken)
+            {
+                this.cancellationToken = cancellationToken;
+            }
+
+            public T GetResult(short token)
+            {
+                throw new OperationCanceledException(cancellationToken);
+            }
+
+            void IUniTaskSource.GetResult(short token)
+            {
+                throw new OperationCanceledException(cancellationToken);
+            }
+
+            public UniTaskStatus GetStatus(short token)
+            {
+                return UniTaskStatus.Canceled;
+            }
+
+            public UniTaskStatus UnsafeGetStatus()
+            {
+                return UniTaskStatus.Canceled;
+            }
+
+            public void OnCompleted(Action<object> continuation, object state, short token)
+            {
+                continuation(state);
+            }
+        }
+
         sealed class DeferPromise : IUniTaskSource
         {
             Func<UniTask> factory;
@@ -201,10 +341,12 @@ namespace Cysharp.Threading.Tasks
             public UniTaskStatus GetStatus(short token)
             {
                 var f = Interlocked.Exchange(ref factory, null);
-                if (f == null) throw new InvalidOperationException("Can't call twice.");
+                if (f != null)
+                {
+                    task = f();
+                    awaiter = task.GetAwaiter();
+                }
 
-                task = f();
-                awaiter = f().GetAwaiter();
                 return task.Status;
             }
 
@@ -243,10 +385,12 @@ namespace Cysharp.Threading.Tasks
             public UniTaskStatus GetStatus(short token)
             {
                 var f = Interlocked.Exchange(ref factory, null);
-                if (f == null) throw new InvalidOperationException("Can't call twice.");
+                if (f != null)
+                {
+                    task = f();
+                    awaiter = task.GetAwaiter();
+                }
 
-                task = f();
-                awaiter = f().GetAwaiter();
                 return task.Status;
             }
 
@@ -260,6 +404,54 @@ namespace Cysharp.Threading.Tasks
                 return task.Status;
             }
         }
+
+        sealed class NeverPromise<T> : IUniTaskSource<T>
+        {
+            static readonly Action<object> cancellationCallback = CancellationCallback;
+
+            CancellationToken cancellationToken;
+            UniTaskCompletionSourceCore<T> core;
+
+            public NeverPromise(CancellationToken cancellationToken)
+            {
+                this.cancellationToken = cancellationToken;
+                if (this.cancellationToken.CanBeCanceled)
+                {
+                    this.cancellationToken.RegisterWithoutCaptureExecutionContext(cancellationCallback, this);
+                }
+            }
+
+            static void CancellationCallback(object state)
+            {
+                var self = (NeverPromise<T>)state;
+                self.core.TrySetCanceled(self.cancellationToken);
+            }
+
+            public T GetResult(short token)
+            {
+                return core.GetResult(token);
+            }
+
+            public UniTaskStatus GetStatus(short token)
+            {
+                return core.GetStatus(token);
+            }
+
+            public UniTaskStatus UnsafeGetStatus()
+            {
+                return core.UnsafeGetStatus();
+            }
+
+            public void OnCompleted(Action<object> continuation, object state, short token)
+            {
+                core.OnCompleted(continuation, state, token);
+            }
+
+            void IUniTaskSource.GetResult(short token)
+            {
+                core.GetResult(token);
+            }
+        }
     }
 
     internal static class CompletedTasks