diff --git a/Assets/Scenes/SandboxMain.cs b/Assets/Scenes/SandboxMain.cs
index c8c4c13..f14c761 100644
--- a/Assets/Scenes/SandboxMain.cs
+++ b/Assets/Scenes/SandboxMain.cs
@@ -6,10 +6,29 @@ using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
 using UniRx.Async;
+using Unity.Collections;
+using Unity.Jobs;
 using UnityEngine;
 using UnityEngine.Networking;
 using UnityEngine.UI;
 
+public struct MyJob : IJob
+{
+    public int loopCount;
+    public NativeArray<int> inOut;
+    public int result;
+
+    public void Execute()
+    {
+        result = 0;
+        for (int i = 0; i < loopCount; i++)
+        {
+            result++;
+        }
+        inOut[0] = result;
+    }
+}
+
 public class SandboxMain : MonoBehaviour
 {
     public Button okButton;
@@ -20,11 +39,45 @@ public class SandboxMain : MonoBehaviour
 
     UniTaskCompletionSource ucs;
 
+
+
+    async UniTask RunStandardDelayAsync()
+    {
+        UnityEngine.Debug.Log("DEB");
+
+        await UniTask.DelayFrame(30);
+
+        UnityEngine.Debug.Log("DEB END");
+    }
+
+    async UniTask RunJobAsync()
+    {
+        var job = new MyJob() { loopCount = 999, inOut = new NativeArray<int>(1, Allocator.TempJob) };
+        JobHandle.ScheduleBatchedJobs();
+
+        var scheduled = job.Schedule();
+
+      
+
+
+        UnityEngine.Debug.Log("OK");
+        await scheduled; // .ConfigureAwait(PlayerLoopTiming.Update); // .WaitAsync(PlayerLoopTiming.Update);
+        UnityEngine.Debug.Log("OK2");
+
+        job.inOut.Dispose();
+    }
+
     void Start()
     {
+        Application.SetStackTraceLogType(LogType.Error, StackTraceLogType.Full);
+        Application.SetStackTraceLogType(LogType.Exception, StackTraceLogType.Full);
+
         var playerLoop = UnityEngine.LowLevel.PlayerLoop.GetCurrentPlayerLoop();
         ShowPlayerLoop.DumpPlayerLoop("Current", playerLoop);
 
+
+        RunStandardDelayAsync().Forget();
+
         //for (int i = 0; i < 14; i++)
         //{
         //    TimingDump((PlayerLoopTiming)i).Forget();
@@ -36,6 +89,19 @@ public class SandboxMain : MonoBehaviour
 
         // -----
 
+        RunJobAsync().Forget();
+
+        //var cor = UniTask.ToCoroutine(async () =>
+        // {
+        //     var job = new MyJob() { loopCount = 999, inOut = new NativeArray<int>(1, Allocator.TempJob) };
+        //     JobHandle.ScheduleBatchedJobs();
+        //     await job.Schedule().WaitAsync(PlayerLoopTiming.Update);
+        //     job.inOut.Dispose();
+        // });
+
+        //StartCoroutine(cor);
+
+
         Application.logMessageReceived += Application_logMessageReceived;
 
 
@@ -56,6 +122,22 @@ public class SandboxMain : MonoBehaviour
         });
     }
 
+    async UniTask SimpleAwait()
+    {
+        await UniTask.Yield();
+        await UniTask.Yield();
+        await UniTask.Yield();
+        throw new InvalidOperationException("bar!!!");
+    }
+
+    IEnumerator SimpleCoroutine()
+    {
+        yield return null;
+        yield return null;
+        yield return null;
+        throw new InvalidOperationException("foo!!!");
+    }
+
     async UniTask TimingDump(PlayerLoopTiming timing)
     {
         while (true)
@@ -124,33 +206,33 @@ public class SandboxMain : MonoBehaviour
         }
     }
 
-/*
-PlayerLoopTiming.Initialization
-PlayerLoopTiming.LastInitialization
-PlayerLoopTiming.EarlyUpdate
-PlayerLoopTiming.LastEarlyUpdate
-PlayerLoopTiming.PreUpdate
-PlayerLoopTiming.LastPreUpdate
-PlayerLoopTiming.Update
-Update
-yield null
-yield WaitForSeconds
-yield WWW
-yield StartCoroutine
-PlayerLoopTiming.LastUpdate
-PlayerLoopTiming.PreLateUpdate
-LateUpdate
-PlayerLoopTiming.LastPreLateUpdate
-PlayerLoopTiming.PostLateUpdate
-PlayerLoopTiming.LastPostLateUpdate
-yield WaitForEndOfFrame
+    /*
+    PlayerLoopTiming.Initialization
+    PlayerLoopTiming.LastInitialization
+    PlayerLoopTiming.EarlyUpdate
+    PlayerLoopTiming.LastEarlyUpdate
+    PlayerLoopTiming.PreUpdate
+    PlayerLoopTiming.LastPreUpdate
+    PlayerLoopTiming.Update
+    Update
+    yield null
+    yield WaitForSeconds
+    yield WWW
+    yield StartCoroutine
+    PlayerLoopTiming.LastUpdate
+    PlayerLoopTiming.PreLateUpdate
+    LateUpdate
+    PlayerLoopTiming.LastPreLateUpdate
+    PlayerLoopTiming.PostLateUpdate
+    PlayerLoopTiming.LastPostLateUpdate
+    yield WaitForEndOfFrame
 
-// --- Physics Loop
-PlayerLoopTiming.FixedUpdate
-FixedUpdate
-yield WaitForFixedUpdate
-PlayerLoopTiming.LastFixedUpdate
-*/
+    // --- Physics Loop
+    PlayerLoopTiming.FixedUpdate
+    FixedUpdate
+    yield WaitForFixedUpdate
+    PlayerLoopTiming.LastFixedUpdate
+    */
 
 
 
diff --git a/Assets/UniRx.Async/UnityAsyncExtensions.Jobs.cs b/Assets/UniRx.Async/UnityAsyncExtensions.Jobs.cs
index 4c76539..fea8b21 100644
--- a/Assets/UniRx.Async/UnityAsyncExtensions.Jobs.cs
+++ b/Assets/UniRx.Async/UnityAsyncExtensions.Jobs.cs
@@ -9,42 +9,45 @@ namespace UniRx.Async
 {
     public static partial class UnityAsyncExtensions
     {
+        public static async UniTask WaitAsync(this JobHandle jobHandle, PlayerLoopTiming waitTiming)
+        {
+            await UniTask.Yield(waitTiming);
+            jobHandle.Complete();
+        }
+
         public static UniTask.Awaiter GetAwaiter(this JobHandle jobHandle)
         {
-            var handler = JobHandlePromise.Create(jobHandle, CancellationToken.None, out var token);
-            if (handler.GetStatus(token).IsCompleted() && handler is JobHandlePromise loopItem)
+            var handler = JobHandlePromise.Create(jobHandle, out var token);
             {
-                PlayerLoopHelper.AddAction(PlayerLoopTiming.EarlyUpdate, loopItem);
-                PlayerLoopHelper.AddAction(PlayerLoopTiming.PreUpdate, loopItem);
-                PlayerLoopHelper.AddAction(PlayerLoopTiming.Update, loopItem);
-                PlayerLoopHelper.AddAction(PlayerLoopTiming.PreLateUpdate, loopItem);
-                PlayerLoopHelper.AddAction(PlayerLoopTiming.PostLateUpdate, loopItem);
+                PlayerLoopHelper.AddAction(PlayerLoopTiming.EarlyUpdate, handler);
+                PlayerLoopHelper.AddAction(PlayerLoopTiming.PreUpdate, handler);
+                PlayerLoopHelper.AddAction(PlayerLoopTiming.Update, handler);
+                PlayerLoopHelper.AddAction(PlayerLoopTiming.PreLateUpdate, handler);
+                PlayerLoopHelper.AddAction(PlayerLoopTiming.PostLateUpdate, handler);
             }
 
             return new UniTask(handler, token).GetAwaiter();
         }
 
-        public static UniTask ToUniTask(this JobHandle jobHandle, CancellationToken cancellation = default(CancellationToken))
+        public static UniTask ToUniTask(this JobHandle jobHandle)
         {
-            var handler = JobHandlePromise.Create(jobHandle, cancellation, out var token);
-            if (handler.GetStatus(token).IsCompleted() && handler is JobHandlePromise loopItem)
+            var handler = JobHandlePromise.Create(jobHandle, out var token);
             {
-                PlayerLoopHelper.AddAction(PlayerLoopTiming.EarlyUpdate, loopItem);
-                PlayerLoopHelper.AddAction(PlayerLoopTiming.PreUpdate, loopItem);
-                PlayerLoopHelper.AddAction(PlayerLoopTiming.Update, loopItem);
-                PlayerLoopHelper.AddAction(PlayerLoopTiming.PreLateUpdate, loopItem);
-                PlayerLoopHelper.AddAction(PlayerLoopTiming.PostLateUpdate, loopItem);
+                PlayerLoopHelper.AddAction(PlayerLoopTiming.EarlyUpdate, handler);
+                PlayerLoopHelper.AddAction(PlayerLoopTiming.PreUpdate, handler);
+                PlayerLoopHelper.AddAction(PlayerLoopTiming.Update, handler);
+                PlayerLoopHelper.AddAction(PlayerLoopTiming.PreLateUpdate, handler);
+                PlayerLoopHelper.AddAction(PlayerLoopTiming.PostLateUpdate, handler);
             }
 
             return new UniTask(handler, token);
         }
 
-        public static UniTask ConfigureAwait(this JobHandle jobHandle, PlayerLoopTiming waitTiming, CancellationToken cancellation = default(CancellationToken))
+        public static UniTask ConfigureAwait(this JobHandle jobHandle, PlayerLoopTiming waitTiming)
         {
-            var handler = JobHandlePromise.Create(jobHandle, cancellation, out var token);
-            if (handler.GetStatus(token).IsCompleted() && handler is JobHandlePromise loopItem)
+            var handler = JobHandlePromise.Create(jobHandle, out var token);
             {
-                PlayerLoopHelper.AddAction(waitTiming, loopItem);
+                PlayerLoopHelper.AddAction(waitTiming, handler);
             }
 
             return new UniTask(handler, token);
@@ -53,22 +56,16 @@ namespace UniRx.Async
         sealed class JobHandlePromise : IUniTaskSource, IPlayerLoopItem
         {
             JobHandle jobHandle;
-            CancellationToken cancellationToken;
 
             UniTaskCompletionSourceCore<AsyncUnit> core;
 
-            public static IUniTaskSource Create(JobHandle jobHandle, CancellationToken cancellationToken, out short token)
+            // Cancellation is not supported.
+            public static JobHandlePromise Create(JobHandle jobHandle, out short token)
             {
-                if (cancellationToken.IsCancellationRequested)
-                {
-                    return AutoResetUniTaskCompletionSource.CreateFromCanceled(cancellationToken, out token);
-                }
-
                 // not use pool.
                 var result = new JobHandlePromise();
 
                 result.jobHandle = jobHandle;
-                result.cancellationToken = cancellationToken;
 
                 TaskTracker.TrackActiveTask(result, 3);
 
@@ -99,12 +96,6 @@ namespace UniRx.Async
 
             public bool MoveNext()
             {
-                if (cancellationToken.IsCancellationRequested)
-                {
-                    core.TrySetCanceled(cancellationToken);
-                    return false;
-                }
-
                 if (jobHandle.IsCompleted)
                 {
                     jobHandle.Complete();