Merge pull request #243 from Cysharp/playerloop-timer

Add PlayerLoopTimer

src/UniTask.NetCore/UniTask.NetCore.csproj

@@ -43,6 +43,7 @@
 ..\UniTask\Assets\Plugins\UniTask\Runtime\EnumeratorAsyncExtensions.cs;
 ..\UniTask\Assets\Plugins\UniTask\Runtime\TimeoutController.cs;
 ..\UniTask\Assets\Plugins\UniTask\Runtime\PlayerLoopHelper.cs;
+..\UniTask\Assets\Plugins\UniTask\Runtime\PlayerLoopTimer.cs;
 ..\UniTask\Assets\Plugins\UniTask\Runtime\UniTask.Delay.cs;
 ..\UniTask\Assets\Plugins\UniTask\Runtime\UniTask.Run.cs;
 ..\UniTask\Assets\Plugins\UniTask\Runtime\UniTask.Bridge.cs;

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

@@ -4,32 +4,29 @@ using System.Threading;
 using UnityEngine;
 using Cysharp.Threading.Tasks.Triggers;
 using System;
+using Cysharp.Threading.Tasks.Internal;
 
 namespace Cysharp.Threading.Tasks
 {
 
-    public static class CancellationTokenSourceExtensions
+    public static partial class CancellationTokenSourceExtensions
     {
-        public static void CancelAfterSlim(this CancellationTokenSource cts, int millisecondsDelay, DelayType delayType = DelayType.DeltaTime, PlayerLoopTiming delayTiming = PlayerLoopTiming.Update)
+        readonly static Action<object> CancelCancellationTokenSourceStateDelegate = new Action<object>(CancelCancellationTokenSourceState);
-        {
-            var delay = UniTask.Delay(millisecondsDelay, delayType, delayTiming, cts.Token);
-            CancelAfterCore(cts, delay).Forget();
-        }
 
-        public static void CancelAfterSlim(this CancellationTokenSource cts, TimeSpan delayTimeSpan, DelayType delayType = DelayType.DeltaTime, PlayerLoopTiming delayTiming = PlayerLoopTiming.Update)
+        static void CancelCancellationTokenSourceState(object state)
-        {
-            var delay = UniTask.Delay(delayTimeSpan, delayType, delayTiming, cts.Token);
-            CancelAfterCore(cts, delay).Forget();
-        }
-
-        static async UniTaskVoid CancelAfterCore(CancellationTokenSource cts, UniTask delayTask)
-        {
-            var alreadyCanceled = await delayTask.SuppressCancellationThrow();
-            if (!alreadyCanceled)
         {
+            var cts = (CancellationTokenSource)state;
             cts.Cancel();
-                cts.Dispose();
         }
+
+        public static IDisposable CancelAfterSlim(this CancellationTokenSource cts, int millisecondsDelay, DelayType delayType = DelayType.DeltaTime, PlayerLoopTiming delayTiming = PlayerLoopTiming.Update)
+        {
+            return CancelAfterSlim(cts, TimeSpan.FromMilliseconds(millisecondsDelay), delayType, delayTiming);
+        }
+
+        public static IDisposable CancelAfterSlim(this CancellationTokenSource cts, TimeSpan delayTimeSpan, DelayType delayType = DelayType.DeltaTime, PlayerLoopTiming delayTiming = PlayerLoopTiming.Update)
+        {
+            return PlayerLoopTimer.StartNew(delayTimeSpan, false, delayType, delayTiming, cts.Token, CancelCancellationTokenSourceStateDelegate, cts);
         }
 
         public static void RegisterRaiseCancelOnDestroy(this CancellationTokenSource cts, Component component)
@@ -40,11 +37,7 @@ namespace Cysharp.Threading.Tasks
         public static void RegisterRaiseCancelOnDestroy(this CancellationTokenSource cts, GameObject gameObject)
         {
             var trigger = gameObject.GetAsyncDestroyTrigger();
-            trigger.CancellationToken.RegisterWithoutCaptureExecutionContext(state =>
+            trigger.CancellationToken.RegisterWithoutCaptureExecutionContext(CancelCancellationTokenSourceStateDelegate, cts);
-            {
-                var cts2 = (CancellationTokenSource)state;
-                cts2.Cancel();
-            }, cts);
         }
     }
 }

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

@@ -0,0 +1,262 @@
+#pragma warning disable CS1591 // Missing XML comment for publicly visible type or member
+
+using System.Threading;
+using System;
+using Cysharp.Threading.Tasks.Internal;
+using UnityEngine;
+
+namespace Cysharp.Threading.Tasks
+{
+    public abstract class PlayerLoopTimer : IDisposable, IPlayerLoopItem
+    {
+        readonly CancellationToken cancellationToken;
+        readonly Action<object> timerCallback;
+        readonly object state;
+        readonly PlayerLoopTiming playerLoopTiming;
+        readonly bool periodic;
+
+        bool isRunning;
+        bool tryStop;
+        bool isDisposed;
+
+        protected PlayerLoopTimer(bool periodic, PlayerLoopTiming playerLoopTiming, CancellationToken cancellationToken, Action<object> timerCallback, object state)
+        {
+            this.periodic = periodic;
+            this.playerLoopTiming = playerLoopTiming;
+            this.cancellationToken = cancellationToken;
+            this.timerCallback = timerCallback;
+            this.state = state;
+        }
+
+        public static PlayerLoopTimer Create(TimeSpan interval, bool periodic, DelayType delayType, PlayerLoopTiming playerLoopTiming, CancellationToken cancellationToken, Action<object> timerCallback, object state)
+        {
+#if UNITY_EDITOR
+            // force use Realtime.
+            if (PlayerLoopHelper.IsMainThread && !UnityEditor.EditorApplication.isPlaying)
+            {
+                delayType = DelayType.Realtime;
+            }
+#endif
+
+            switch (delayType)
+            {
+                case DelayType.UnscaledDeltaTime:
+                    return new IgnoreTimeScalePlayerLoopTimer(interval, periodic, playerLoopTiming, cancellationToken, timerCallback, state);
+                case DelayType.Realtime:
+                    return new RealtimePlayerLoopTimer(interval, periodic, playerLoopTiming, cancellationToken, timerCallback, state);
+                case DelayType.DeltaTime:
+                default:
+                    return new DeltaTimePlayerLoopTimer(interval, periodic, playerLoopTiming, cancellationToken, timerCallback, state);
+            }
+        }
+
+        public static PlayerLoopTimer StartNew(TimeSpan interval, bool periodic, DelayType delayType, PlayerLoopTiming playerLoopTiming, CancellationToken cancellationToken, Action<object> timerCallback, object state)
+        {
+            var timer = Create(interval, periodic, delayType, playerLoopTiming, cancellationToken, timerCallback, state);
+            timer.Restart();
+            return timer;
+        }
+
+        /// <summary>
+        /// Restart(Reset and Start) timer.
+        /// </summary>
+        public void Restart()
+        {
+            if (isDisposed) throw new ObjectDisposedException(null);
+
+            ResetCore(null); // init state
+            if (!isRunning)
+            {
+                isRunning = true;
+                PlayerLoopHelper.AddAction(playerLoopTiming, this);
+            }
+            tryStop = false;
+        }
+
+        /// <summary>
+        /// Restart(Reset and Start) and change interval.
+        /// </summary>
+        public void Restart(TimeSpan interval)
+        {
+            if (isDisposed) throw new ObjectDisposedException(null);
+
+            ResetCore(interval); // init state
+            if (!isRunning)
+            {
+                isRunning = true;
+                PlayerLoopHelper.AddAction(playerLoopTiming, this);
+            }
+            tryStop = false;
+        }
+
+        /// <summary>
+        /// Stop timer.
+        /// </summary>
+        public void Stop()
+        {
+            tryStop = true;
+        }
+
+        protected abstract void ResetCore(TimeSpan? newInterval);
+
+        public void Dispose()
+        {
+            isDisposed = true;
+        }
+
+        bool IPlayerLoopItem.MoveNext()
+        {
+            if (isDisposed)
+            {
+                isRunning = false;
+                return false;
+            }
+            if (tryStop)
+            {
+                isRunning = false;
+                return false;
+            }
+            if (cancellationToken.IsCancellationRequested)
+            {
+                isRunning = false;
+                return false;
+            }
+
+            if (!MoveNextCore())
+            {
+                timerCallback(state);
+
+                if (periodic)
+                {
+                    ResetCore(null);
+                    return true;
+                }
+                else
+                {
+                    isRunning = false;
+                    return false;
+                }
+            }
+
+            return true;
+        }
+
+        protected abstract bool MoveNextCore();
+    }
+
+    sealed class DeltaTimePlayerLoopTimer : PlayerLoopTimer
+    {
+        int initialFrame;
+        float elapsed;
+        float interval;
+
+        public DeltaTimePlayerLoopTimer(TimeSpan interval, bool periodic, PlayerLoopTiming playerLoopTiming, CancellationToken cancellationToken, Action<object> timerCallback, object state)
+            : base(periodic, playerLoopTiming, cancellationToken, timerCallback, state)
+        {
+            ResetCore(interval);
+        }
+
+        protected override bool MoveNextCore()
+        {
+            if (elapsed == 0.0f)
+            {
+                if (initialFrame == Time.frameCount)
+                {
+                    return true;
+                }
+            }
+
+            elapsed += Time.deltaTime;
+            if (elapsed >= interval)
+            {
+                return false;
+            }
+
+            return true;
+        }
+
+        protected override void ResetCore(TimeSpan? interval)
+        {
+            this.elapsed = 0.0f;
+            this.initialFrame = PlayerLoopHelper.IsMainThread ? Time.frameCount : -1;
+            if (interval != null)
+            {
+                this.interval = (float)interval.Value.TotalSeconds;
+            }
+        }
+    }
+
+    sealed class IgnoreTimeScalePlayerLoopTimer : PlayerLoopTimer
+    {
+        int initialFrame;
+        float elapsed;
+        float interval;
+
+        public IgnoreTimeScalePlayerLoopTimer(TimeSpan interval, bool periodic, PlayerLoopTiming playerLoopTiming, CancellationToken cancellationToken, Action<object> timerCallback, object state)
+            : base(periodic, playerLoopTiming, cancellationToken, timerCallback, state)
+        {
+            ResetCore(interval);
+        }
+
+        protected override bool MoveNextCore()
+        {
+            if (elapsed == 0.0f)
+            {
+                if (initialFrame == Time.frameCount)
+                {
+                    return true;
+                }
+            }
+
+            elapsed += Time.unscaledDeltaTime;
+            if (elapsed >= interval)
+            {
+                return false;
+            }
+
+            return true;
+        }
+
+        protected override void ResetCore(TimeSpan? interval)
+        {
+            this.elapsed = 0.0f;
+            this.initialFrame = PlayerLoopHelper.IsMainThread ? Time.frameCount : -1;
+            if (interval != null)
+            {
+                this.interval = (float)interval.Value.TotalSeconds;
+            }
+        }
+    }
+
+    sealed class RealtimePlayerLoopTimer : PlayerLoopTimer
+    {
+        ValueStopwatch stopwatch;
+        long intervalTicks;
+
+        public RealtimePlayerLoopTimer(TimeSpan interval, bool periodic, PlayerLoopTiming playerLoopTiming, CancellationToken cancellationToken, Action<object> timerCallback, object state)
+            : base(periodic, playerLoopTiming, cancellationToken, timerCallback, state)
+        {
+            ResetCore(interval);
+        }
+
+        protected override bool MoveNextCore()
+        {
+            if (stopwatch.ElapsedTicks >= intervalTicks)
+            {
+                return false;
+            }
+
+            return true;
+        }
+
+        protected override void ResetCore(TimeSpan? interval)
+        {
+            this.stopwatch = ValueStopwatch.StartNew();
+            if (interval != null)
+            {
+                this.intervalTicks = interval.Value.Ticks;
+            }
+        }
+    }
+}
+

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

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 57095a17fdca7ee4380450910afc7f26
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

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

@@ -1,8 +1,7 @@
 #pragma warning disable CS1591 // Missing XML comment for publicly visible type or member
 
-using System.Threading;
 using System;
-using Cysharp.Threading.Tasks.Internal;
+using System.Threading;
 
 namespace Cysharp.Threading.Tasks
 {
@@ -14,26 +13,44 @@ namespace Cysharp.Threading.Tasks
 
     public sealed class TimeoutController : IDisposable
     {
+        readonly static Action<object> CancelCancellationTokenSourceStateDelegate = new Action<object>(CancelCancellationTokenSourceState);
+
+        static void CancelCancellationTokenSourceState(object state)
+        {
+            var cts = (CancellationTokenSource)state;
+            cts.Cancel();
+        }
+
         CancellationTokenSource timeoutSource;
         CancellationTokenSource linkedSource;
-        StoppableDelayRealtimePromise timeoutDelay;
+        PlayerLoopTimer timer;
+        bool isDisposed;
 
+        readonly DelayType delayType;
+        readonly PlayerLoopTiming delayTiming;
         readonly CancellationTokenSource originalLinkCancellationTokenSource;
 
-        public TimeoutController()
+        public TimeoutController(DelayType delayType = DelayType.DeltaTime, PlayerLoopTiming delayTiming = PlayerLoopTiming.Update)
         {
             this.timeoutSource = new CancellationTokenSource();
             this.originalLinkCancellationTokenSource = null;
             this.linkedSource = null;
-            this.timeoutDelay = null;
+            this.delayType = delayType;
+            this.delayTiming = delayTiming;
         }
 
-        public TimeoutController(CancellationTokenSource linkCancellationTokenSource)
+        public TimeoutController(CancellationTokenSource linkCancellationTokenSource, DelayType delayType = DelayType.DeltaTime, PlayerLoopTiming delayTiming = PlayerLoopTiming.Update)
         {
             this.timeoutSource = new CancellationTokenSource();
             this.originalLinkCancellationTokenSource = linkCancellationTokenSource;
             this.linkedSource = CancellationTokenSource.CreateLinkedTokenSource(timeoutSource.Token, linkCancellationTokenSource.Token);
-            this.timeoutDelay = null;
+            this.delayType = delayType;
+            this.delayTiming = delayTiming;
+        }
+
+        public CancellationToken Timeout(int millisecondsTimeout)
+        {
+            return Timeout(TimeSpan.FromMilliseconds(millisecondsTimeout));
         }
 
         public CancellationToken Timeout(TimeSpan timeout)
@@ -43,6 +60,7 @@ namespace Cysharp.Threading.Tasks
                 return originalLinkCancellationTokenSource.Token;
             }
 
+            // Timeouted, create new source and timer.
             if (timeoutSource.IsCancellationRequested)
             {
                 timeoutSource.Dispose();
@@ -53,18 +71,25 @@ namespace Cysharp.Threading.Tasks
                     this.linkedSource.Dispose();
                     this.linkedSource = CancellationTokenSource.CreateLinkedTokenSource(timeoutSource.Token, originalLinkCancellationTokenSource.Token);
                 }
+
+                timer?.Dispose();
+                timer = null;
             }
 
-            if (timeoutDelay == null)
+            var useSource = (linkedSource != null) ? linkedSource : timeoutSource;
+            var token = useSource.Token;
+            if (timer == null)
             {
-                RunDelayAsync(timeout).Forget(); // timeoutDelay = ... in RunDelayAsync(immediately, before await)
+                // Timer complete => timeoutSource.Cancel() -> linkedSource will be canceled.
+                // (linked)token is canceled => stop timer
+                timer = PlayerLoopTimer.StartNew(timeout, false, delayType, delayTiming, token, CancelCancellationTokenSourceStateDelegate, timeoutSource);
             }
             else
             {
-                timeoutDelay.RestartStopwatch(); // already running RunDelayAsync
+                timer.Restart(timeout);
             }
 
-            return (linkedSource != null) ? linkedSource.Token : timeoutSource.Token;
+            return token;
         }
 
         public bool IsTimeout()
@@ -74,184 +99,30 @@ namespace Cysharp.Threading.Tasks
 
         public void Reset()
         {
-            if (timeoutDelay != null)
+            timer.Stop();
-            {
-                timeoutDelay.Stop(); // stop delay, will finish RunDelayAsync
-                timeoutDelay = null;
-            }
-        }
-
-        async UniTaskVoid RunDelayAsync(TimeSpan timeout)
-        {
-            timeoutDelay = StoppableDelayRealtimePromise.Create(timeout, PlayerLoopTiming.Update, (linkedSource == null) ? CancellationToken.None : linkedSource.Token, out var version);
-            try
-            {
-                var reason = await new UniTask<DelayResult>(timeoutDelay, version);
-                if (reason == DelayResult.DelayCompleted)
-                {
-                    // UnityEngine.Debug.Log("DEBUG:Timeout Complete, try to call timeoutSource.Cancel");
-                    timeoutSource.Cancel();
-                }
-                else if (reason == DelayResult.LinkedTokenCanceled)
-                {
-                    // UnityEngine.Debug.Log("DEBUG:LinkedSource IsCancellationRequested");
-                }
-                else if (reason == DelayResult.ExternalStopped)
-                {
-                    // Reset(Promise.Stop) called, do nothing.
-                    // UnityEngine.Debug.Log("DEBUG:Reset called");
-                }
-            }
-            finally
-            {
-                timeoutDelay = null;
-            }
         }
 
         public void Dispose()
         {
-            if (timeoutDelay != null)
+            if (isDisposed) return;
+
+            try
             {
-                timeoutDelay.Stop();
+                // stop timer.
-            }
+                timer.Dispose();
+
+                // cancel and dispose.
+                timeoutSource.Cancel();
                 timeoutSource.Dispose();
                 if (linkedSource != null)
                 {
+                    linkedSource.Cancel();
                     linkedSource.Dispose();
                 }
             }
-
-        enum DelayResult
-        {
-            LinkedTokenCanceled,
-            ExternalStopped,
-            DelayCompleted, // as Timeout.
-        }
-
-        // Stop + SuppressCancellationThrow.
-        sealed class StoppableDelayRealtimePromise : IUniTaskSource<DelayResult>, IPlayerLoopItem, ITaskPoolNode<StoppableDelayRealtimePromise>
-        {
-            static OperationCanceledException ExterenalStopException = new OperationCanceledException();
-
-            static TaskPool<StoppableDelayRealtimePromise> pool;
-            StoppableDelayRealtimePromise nextNode;
-            public ref StoppableDelayRealtimePromise NextNode => ref nextNode;
-
-            static StoppableDelayRealtimePromise()
-            {
-                TaskPool.RegisterSizeGetter(typeof(StoppableDelayRealtimePromise), () => pool.Size);
-            }
-
-            long delayTimeSpanTicks;
-            ValueStopwatch stopwatch;
-            CancellationToken cancellationToken;
-            bool externalStop;
-
-            UniTaskCompletionSourceCore<DelayResult> core;
-
-            StoppableDelayRealtimePromise()
-            {
-            }
-
-            public static StoppableDelayRealtimePromise Create(TimeSpan delayTimeSpan, PlayerLoopTiming timing, CancellationToken cancellationToken, out short token)
-            {
-                if (!pool.TryPop(out var result))
-                {
-                    result = new StoppableDelayRealtimePromise();
-                }
-
-                result.stopwatch = ValueStopwatch.StartNew();
-                result.delayTimeSpanTicks = delayTimeSpan.Ticks;
-                result.cancellationToken = cancellationToken;
-                result.externalStop = false;
-
-                TaskTracker.TrackActiveTask(result, 3);
-
-                PlayerLoopHelper.AddAction(timing, result);
-
-                token = result.core.Version;
-                return result;
-            }
-
-            public void Stop()
-            {
-                externalStop = true;
-            }
-
-            public void RestartStopwatch()
-            {
-                stopwatch = ValueStopwatch.StartNew();
-            }
-
-            public DelayResult GetResult(short token)
-            {
-                try
-                {
-                    return core.GetResult(token);
-                }
             finally
             {
-                    TryReturn();
+                isDisposed = true;
-                }
-            }
-
-            void IUniTaskSource.GetResult(short token)
-            {
-                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 bool MoveNext()
-            {
-                if (cancellationToken.IsCancellationRequested)
-                {
-                    core.TrySetResult(DelayResult.LinkedTokenCanceled);
-                    return false;
-                }
-
-                if (externalStop)
-                {
-                    core.TrySetResult(DelayResult.ExternalStopped);
-                    return false;
-                }
-
-                if (stopwatch.IsInvalid)
-                {
-                    core.TrySetResult(DelayResult.DelayCompleted);
-                    return false;
-                }
-
-                if (stopwatch.ElapsedTicks >= delayTimeSpanTicks)
-                {
-                    core.TrySetResult(DelayResult.DelayCompleted);
-                    return false;
-                }
-
-                return true;
-            }
-
-            bool TryReturn()
-            {
-                TaskTracker.RemoveTracking(this);
-                core.Reset();
-                stopwatch = default;
-                cancellationToken = default;
-                externalStop = false;
-                return pool.TryPush(this);
             }
         }
     }

src/UniTask/Assets/Tests/PlayerLoopTimerTest.cs

@@ -0,0 +1,179 @@
+using Cysharp.Threading.Tasks;
+using FluentAssertions;
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using UnityEngine.TestTools;
+
+namespace Cysharp.Threading.TasksTests
+{
+    public class PlayerLoopTimerTest
+    {
+        void Between(TimeSpan l, TimeSpan data, TimeSpan r)
+        {
+            NUnit.Framework.Assert.AreEqual(l < data, true, "{0} < {1} failed.", l, data);
+            NUnit.Framework.Assert.AreEqual(data < r, true, "{0} < {1} failed.", data, r);
+        }
+
+        [UnityTest]
+        public IEnumerator StandardTicks() => UniTask.ToCoroutine(async () =>
+        {
+            foreach (var delay in new[] { DelayType.DeltaTime, DelayType.Realtime, DelayType.UnscaledDeltaTime })
+            {
+                var raisedTimeout = new UniTaskCompletionSource();
+                PlayerLoopTimer.StartNew(TimeSpan.FromSeconds(1), false, delay, PlayerLoopTiming.Update, CancellationToken.None, _ =>
+                {
+                    raisedTimeout.TrySetResult();
+                }, null);
+
+
+                var sw = Stopwatch.StartNew();
+                await raisedTimeout.Task;
+                sw.Stop();
+
+                Between(TimeSpan.FromSeconds(0.9), sw.Elapsed, TimeSpan.FromSeconds(1.1));
+            }
+        });
+
+
+        [UnityTest]
+        public IEnumerator Periodic() => UniTask.ToCoroutine(async () =>
+        {
+            var raisedTime = new List<DateTime>();
+            var count = 0;
+            var complete = new UniTaskCompletionSource();
+
+            PlayerLoopTimer timer = null;
+            timer = PlayerLoopTimer.StartNew(TimeSpan.FromSeconds(1), true, DelayType.DeltaTime, PlayerLoopTiming.Update, CancellationToken.None, _ =>
+            {
+                raisedTime.Add(DateTime.UtcNow);
+                count++;
+                if (count == 3)
+                {
+                    complete.TrySetResult();
+                    timer.Dispose();
+                }
+            }, null);
+
+            var start = DateTime.UtcNow;
+            await complete.Task;
+
+            Between(TimeSpan.FromSeconds(0.9), raisedTime[0] - start, TimeSpan.FromSeconds(1.1));
+            Between(TimeSpan.FromSeconds(1.9), raisedTime[1] - start, TimeSpan.FromSeconds(2.1));
+            Between(TimeSpan.FromSeconds(2.9), raisedTime[2] - start, TimeSpan.FromSeconds(3.1));
+        });
+
+        [UnityTest]
+        public IEnumerator CancelAfterSlimTest() => UniTask.ToCoroutine(async () =>
+        {
+            var cts = new CancellationTokenSource();
+            var complete = new UniTaskCompletionSource();
+            cts.Token.RegisterWithoutCaptureExecutionContext(() =>
+            {
+                complete.TrySetResult();
+            });
+
+            cts.CancelAfterSlim(TimeSpan.FromSeconds(1));
+
+            var sw = Stopwatch.StartNew();
+            await complete.Task;
+
+            Between(TimeSpan.FromSeconds(0.9), sw.Elapsed, TimeSpan.FromSeconds(1.1));
+        });
+
+        [UnityTest]
+        public IEnumerator CancelAfterSlimCancelTest() => UniTask.ToCoroutine(async () =>
+        {
+            var cts = new CancellationTokenSource();
+            var complete = new UniTaskCompletionSource();
+            cts.Token.RegisterWithoutCaptureExecutionContext(() =>
+            {
+                complete.TrySetResult();
+            });
+
+            var d = cts.CancelAfterSlim(TimeSpan.FromSeconds(1));
+
+            var sw = Stopwatch.StartNew();
+
+            await UniTask.Delay(TimeSpan.FromMilliseconds(100));
+            d.Dispose();
+
+            await UniTask.Delay(TimeSpan.FromSeconds(2));
+
+            complete.Task.Status.Should().Be(UniTaskStatus.Pending);
+        });
+
+        [UnityTest]
+        public IEnumerator TimeoutController() => UniTask.ToCoroutine(async () =>
+        {
+            var controller = new TimeoutController();
+
+            var token = controller.Timeout(TimeSpan.FromSeconds(1));
+
+            var complete = new UniTaskCompletionSource();
+            token.RegisterWithoutCaptureExecutionContext(() =>
+            {
+                complete.TrySetResult();
+            });
+
+            var sw = Stopwatch.StartNew();
+            await complete.Task;
+            Between(TimeSpan.FromSeconds(0.9), sw.Elapsed, TimeSpan.FromSeconds(1.1));
+
+            controller.IsTimeout().Should().BeTrue();
+        });
+
+
+        [UnityTest]
+        public IEnumerator TimeoutReuse() => UniTask.ToCoroutine(async () =>
+        {
+            var controller = new TimeoutController(DelayType.DeltaTime);
+
+            var token = controller.Timeout(TimeSpan.FromSeconds(2));
+
+            var complete = new UniTaskCompletionSource();
+            token.RegisterWithoutCaptureExecutionContext(() =>
+            {
+                complete.TrySetResult(); // reuse, used same token?
+            });
+
+            await UniTask.Delay(TimeSpan.FromMilliseconds(100));
+            controller.Reset();
+
+            controller.IsTimeout().Should().BeFalse();
+
+            var sw = Stopwatch.StartNew();
+
+            controller.Timeout(TimeSpan.FromSeconds(5));
+
+            await complete.Task;
+
+            UnityEngine.Debug.Log(UnityEngine.Time.timeScale);
+            Between(TimeSpan.FromSeconds(4.9), sw.Elapsed, TimeSpan.FromSeconds(5.1));
+
+            controller.IsTimeout().Should().BeTrue();
+        });
+
+        [UnityTest]
+        public IEnumerator LinkedTokenTest() => UniTask.ToCoroutine(async () =>
+        {
+            var cts = new CancellationTokenSource();
+
+            var controller = new TimeoutController(cts);
+            var token = controller.Timeout(TimeSpan.FromSeconds(2));
+
+            await UniTask.DelayFrame(3);
+
+            cts.Cancel();
+
+            token.IsCancellationRequested.Should().BeTrue();
+
+            controller.Dispose();
+        });
+    }
+}

src/UniTask/Assets/Tests/PlayerLoopTimerTest.cs.meta

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