Use ref T for ITaskPoolNode<T>.NextNode

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

@@ -62,7 +62,8 @@ 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()
                 {

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

@@ -87,7 +87,8 @@ namespace Cysharp.Threading.Tasks
             static Action<object> cancellationCallback = CancellationCallback;
 
             static TaskPool<WaitAsyncSource> pool;
-            WaitAsyncSource ITaskPoolNode<WaitAsyncSource>.NextNode { get; set; }
+            WaitAsyncSource nextNode;
+            ref WaitAsyncSource ITaskPoolNode<WaitAsyncSource>.NextNode => ref nextNode;
 
             static WaitAsyncSource()
             {
@@ -404,7 +405,8 @@ namespace Cysharp.Threading.Tasks
             static Action<object> cancellationCallback = CancellationCallback;
 
             static TaskPool<WaitAsyncSource> pool;
-            WaitAsyncSource ITaskPoolNode<WaitAsyncSource>.NextNode { get; set; }
+            WaitAsyncSource nextNode;
+            ref WaitAsyncSource ITaskPoolNode<WaitAsyncSource>.NextNode => ref nextNode;
 
             static WaitAsyncSource()
             {

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

@@ -87,7 +87,8 @@ namespace Cysharp.Threading.Tasks.CompilerServices
             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()
         {
@@ -157,7 +158,8 @@ namespace Cysharp.Threading.Tasks.CompilerServices
             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()
         {
@@ -279,7 +281,8 @@ namespace Cysharp.Threading.Tasks.CompilerServices
             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()
         {

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

@@ -35,7 +35,8 @@ namespace Cysharp.Threading.Tasks
         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()
             {

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

@@ -7,7 +7,8 @@ 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()
         {

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

@@ -55,7 +55,7 @@ namespace Cysharp.Threading.Tasks
 
     public interface ITaskPoolNode<T>
     {
-        T NextNode { get; set; }
+        ref T NextNode { get; }
     }
 
     // mutable struct, don't mark readonly.
@@ -77,8 +77,9 @@ namespace Cysharp.Threading.Tasks
                 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);

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

@@ -127,7 +127,8 @@ namespace Cysharp.Threading.Tasks
         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()
             {
@@ -215,7 +216,8 @@ namespace Cysharp.Threading.Tasks
         sealed class NextFramePromise : IUniTaskSource, IPlayerLoopItem, ITaskPoolNode<NextFramePromise>
         {
             static TaskPool<NextFramePromise> pool;
-            public NextFramePromise NextNode { get; set; }
+            NextFramePromise nextNode;
+            public ref NextFramePromise NextNode => ref nextNode;
 
             static NextFramePromise()
             {
@@ -309,7 +311,8 @@ namespace Cysharp.Threading.Tasks
         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()
             {
@@ -424,7 +427,8 @@ namespace Cysharp.Threading.Tasks
         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()
             {
@@ -534,7 +538,8 @@ namespace Cysharp.Threading.Tasks
         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()
             {
@@ -644,7 +649,8 @@ namespace Cysharp.Threading.Tasks
         sealed class DelayRealtimePromise : IUniTaskSource, IPlayerLoopItem, ITaskPoolNode<DelayRealtimePromise>
         {
             static TaskPool<DelayRealtimePromise> pool;
-            public DelayRealtimePromise NextNode { get; set; }
+            DelayRealtimePromise nextNode;
+            public ref DelayRealtimePromise NextNode => ref nextNode;
 
             static DelayRealtimePromise()
             {

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

@@ -224,7 +224,8 @@ 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()
             {

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

@@ -38,7 +38,8 @@ namespace Cysharp.Threading.Tasks
         sealed class WaitUntilPromise : IUniTaskSource, IPlayerLoopItem, ITaskPoolNode<WaitUntilPromise>
         {
             static TaskPool<WaitUntilPromise> pool;
-            public WaitUntilPromise NextNode { get; set; }
+            WaitUntilPromise nextNode;
+            public ref WaitUntilPromise NextNode => ref nextNode;
 
             static WaitUntilPromise()
             {
@@ -142,7 +143,8 @@ namespace Cysharp.Threading.Tasks
         sealed class WaitWhilePromise : IUniTaskSource, IPlayerLoopItem, ITaskPoolNode<WaitWhilePromise>
         {
             static TaskPool<WaitWhilePromise> pool;
-            public WaitWhilePromise NextNode { get; set; }
+            WaitWhilePromise nextNode;
+            public ref WaitWhilePromise NextNode => ref nextNode;
 
             static WaitWhilePromise()
             {
@@ -246,7 +248,8 @@ namespace Cysharp.Threading.Tasks
         sealed class WaitUntilCanceledPromise : IUniTaskSource, IPlayerLoopItem, ITaskPoolNode<WaitUntilCanceledPromise>
         {
             static TaskPool<WaitUntilCanceledPromise> pool;
-            public WaitUntilCanceledPromise NextNode { get; set; }
+            WaitUntilCanceledPromise nextNode;
+            public ref WaitUntilCanceledPromise NextNode => ref nextNode;
 
             static WaitUntilCanceledPromise()
             {
@@ -334,7 +337,8 @@ namespace Cysharp.Threading.Tasks
         sealed class WaitUntilValueChangedUnityObjectPromise<T, U> : IUniTaskSource<U>, IPlayerLoopItem, ITaskPoolNode<WaitUntilValueChangedUnityObjectPromise<T, U>>
         {
             static TaskPool<WaitUntilValueChangedUnityObjectPromise<T, U>> pool;
-            public WaitUntilValueChangedUnityObjectPromise<T, U> NextNode { get; set; }
+            WaitUntilValueChangedUnityObjectPromise<T, U> nextNode;
+            public ref WaitUntilValueChangedUnityObjectPromise<T, U> NextNode => ref nextNode;
 
             static WaitUntilValueChangedUnityObjectPromise()
             {
@@ -457,7 +461,8 @@ namespace Cysharp.Threading.Tasks
             where T : class
         {
             static TaskPool<WaitUntilValueChangedStandardObjectPromise<T, U>> pool;
-            public WaitUntilValueChangedStandardObjectPromise<T, U> NextNode { get; set; }
+            WaitUntilValueChangedStandardObjectPromise<T, U> nextNode;
+            public ref WaitUntilValueChangedStandardObjectPromise<T, U> NextNode => ref nextNode;
 
             static WaitUntilValueChangedStandardObjectPromise()
             {

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

@@ -319,7 +319,8 @@ namespace Cysharp.Threading.Tasks
     public class AutoResetUniTaskCompletionSource : IUniTaskSource, ITaskPoolNode<AutoResetUniTaskCompletionSource>, IPromise
     {
         static TaskPool<AutoResetUniTaskCompletionSource> pool;
-        public AutoResetUniTaskCompletionSource NextNode { get; set; }
+        AutoResetUniTaskCompletionSource nextNode;
+        public ref AutoResetUniTaskCompletionSource NextNode => ref nextNode;
 
         static AutoResetUniTaskCompletionSource()
         {
@@ -441,7 +442,8 @@ namespace Cysharp.Threading.Tasks
     public class AutoResetUniTaskCompletionSource<T> : IUniTaskSource<T>, ITaskPoolNode<AutoResetUniTaskCompletionSource<T>>, IPromise<T>
     {
         static TaskPool<AutoResetUniTaskCompletionSource<T>> pool;
-        public AutoResetUniTaskCompletionSource<T> NextNode { get; set; }
+        AutoResetUniTaskCompletionSource<T> nextNode;
+        public ref AutoResetUniTaskCompletionSource<T> NextNode => ref nextNode;
 
         static AutoResetUniTaskCompletionSource()
         {

src/UniTask/Assets/Plugins/UniTask/Runtime/UnityAsyncExtensions.AssetBundleRequestAllAssets.cs

@@ -82,7 +82,8 @@ namespace Cysharp.Threading.Tasks
         sealed class AssetBundleRequestAllAssetsWithCancellationSource : IUniTaskSource<UnityEngine.Object[]>, IPlayerLoopItem, ITaskPoolNode<AssetBundleRequestAllAssetsWithCancellationSource>
         {
             static TaskPool<AssetBundleRequestAllAssetsWithCancellationSource> pool;
-            public AssetBundleRequestAllAssetsWithCancellationSource NextNode { get; set; }
+            AssetBundleRequestAllAssetsWithCancellationSource nextNode;
+            public ref AssetBundleRequestAllAssetsWithCancellationSource NextNode => ref nextNode;
 
             static AssetBundleRequestAllAssetsWithCancellationSource()
             {
@@ -204,7 +205,8 @@ namespace Cysharp.Threading.Tasks
         sealed class AssetBundleRequestAllAssetsConfiguredSource : IUniTaskSource<UnityEngine.Object[]>, IPlayerLoopItem, ITaskPoolNode<AssetBundleRequestAllAssetsConfiguredSource>
         {
             static TaskPool<AssetBundleRequestAllAssetsConfiguredSource> pool;
-            public AssetBundleRequestAllAssetsConfiguredSource NextNode { get; set; }
+            AssetBundleRequestAllAssetsConfiguredSource nextNode;
+            public ref AssetBundleRequestAllAssetsConfiguredSource NextNode => ref nextNode;
 
             static AssetBundleRequestAllAssetsConfiguredSource()
             {

src/UniTask/Assets/Plugins/UniTask/Runtime/UnityAsyncExtensions.AsyncGPUReadback.cs

@@ -29,7 +29,8 @@ namespace Cysharp.Threading.Tasks
         sealed class AsyncGPUReadbackRequestAwaiterConfiguredSource : IUniTaskSource<AsyncGPUReadbackRequest>, IPlayerLoopItem, ITaskPoolNode<AsyncGPUReadbackRequestAwaiterConfiguredSource>
         {
             static TaskPool<AsyncGPUReadbackRequestAwaiterConfiguredSource> pool;
-            public AsyncGPUReadbackRequestAwaiterConfiguredSource NextNode { get; set; }
+            AsyncGPUReadbackRequestAwaiterConfiguredSource nextNode;
+            public ref AsyncGPUReadbackRequestAwaiterConfiguredSource NextNode => ref nextNode;
 
             static AsyncGPUReadbackRequestAwaiterConfiguredSource()
             {

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

@@ -80,7 +80,8 @@ namespace Cysharp.Threading.Tasks
         sealed class AsyncOperationWithCancellationSource : IUniTaskSource, IPlayerLoopItem, ITaskPoolNode<AsyncOperationWithCancellationSource>
         {
             static TaskPool<AsyncOperationWithCancellationSource> pool;
-            public AsyncOperationWithCancellationSource NextNode { get; set; }
+            AsyncOperationWithCancellationSource nextNode;
+            public ref AsyncOperationWithCancellationSource NextNode => ref nextNode;
 
             static AsyncOperationWithCancellationSource()
             {
@@ -198,7 +199,8 @@ namespace Cysharp.Threading.Tasks
         sealed class AsyncOperationConfiguredSource : IUniTaskSource, IPlayerLoopItem, ITaskPoolNode<AsyncOperationConfiguredSource>
         {
             static TaskPool<AsyncOperationConfiguredSource> pool;
-            public AsyncOperationConfiguredSource NextNode { get; set; }
+            AsyncOperationConfiguredSource nextNode;
+            public ref AsyncOperationConfiguredSource NextNode => ref nextNode;
 
             static AsyncOperationConfiguredSource()
             {
@@ -374,7 +376,8 @@ namespace Cysharp.Threading.Tasks
         sealed class ResourceRequestWithCancellationSource : IUniTaskSource<UnityEngine.Object>, IPlayerLoopItem, ITaskPoolNode<ResourceRequestWithCancellationSource>
         {
             static TaskPool<ResourceRequestWithCancellationSource> pool;
-            public ResourceRequestWithCancellationSource NextNode { get; set; }
+            ResourceRequestWithCancellationSource nextNode;
+            public ref ResourceRequestWithCancellationSource NextNode => ref nextNode;
 
             static ResourceRequestWithCancellationSource()
             {
@@ -496,7 +499,8 @@ namespace Cysharp.Threading.Tasks
         sealed class ResourceRequestConfiguredSource : IUniTaskSource<UnityEngine.Object>, IPlayerLoopItem, ITaskPoolNode<ResourceRequestConfiguredSource>
         {
             static TaskPool<ResourceRequestConfiguredSource> pool;
-            public ResourceRequestConfiguredSource NextNode { get; set; }
+            ResourceRequestConfiguredSource nextNode;
+            public ref ResourceRequestConfiguredSource NextNode => ref nextNode;
 
             static ResourceRequestConfiguredSource()
             {
@@ -677,7 +681,8 @@ namespace Cysharp.Threading.Tasks
         sealed class AssetBundleRequestWithCancellationSource : IUniTaskSource<UnityEngine.Object>, IPlayerLoopItem, ITaskPoolNode<AssetBundleRequestWithCancellationSource>
         {
             static TaskPool<AssetBundleRequestWithCancellationSource> pool;
-            public AssetBundleRequestWithCancellationSource NextNode { get; set; }
+            AssetBundleRequestWithCancellationSource nextNode;
+            public ref AssetBundleRequestWithCancellationSource NextNode => ref nextNode;
 
             static AssetBundleRequestWithCancellationSource()
             {
@@ -799,7 +804,8 @@ namespace Cysharp.Threading.Tasks
         sealed class AssetBundleRequestConfiguredSource : IUniTaskSource<UnityEngine.Object>, IPlayerLoopItem, ITaskPoolNode<AssetBundleRequestConfiguredSource>
         {
             static TaskPool<AssetBundleRequestConfiguredSource> pool;
-            public AssetBundleRequestConfiguredSource NextNode { get; set; }
+            AssetBundleRequestConfiguredSource nextNode;
+            public ref AssetBundleRequestConfiguredSource NextNode => ref nextNode;
 
             static AssetBundleRequestConfiguredSource()
             {
@@ -981,7 +987,8 @@ namespace Cysharp.Threading.Tasks
         sealed class AssetBundleCreateRequestWithCancellationSource : IUniTaskSource<AssetBundle>, IPlayerLoopItem, ITaskPoolNode<AssetBundleCreateRequestWithCancellationSource>
         {
             static TaskPool<AssetBundleCreateRequestWithCancellationSource> pool;
-            public AssetBundleCreateRequestWithCancellationSource NextNode { get; set; }
+            AssetBundleCreateRequestWithCancellationSource nextNode;
+            public ref AssetBundleCreateRequestWithCancellationSource NextNode => ref nextNode;
 
             static AssetBundleCreateRequestWithCancellationSource()
             {
@@ -1103,7 +1110,8 @@ namespace Cysharp.Threading.Tasks
         sealed class AssetBundleCreateRequestConfiguredSource : IUniTaskSource<AssetBundle>, IPlayerLoopItem, ITaskPoolNode<AssetBundleCreateRequestConfiguredSource>
         {
             static TaskPool<AssetBundleCreateRequestConfiguredSource> pool;
-            public AssetBundleCreateRequestConfiguredSource NextNode { get; set; }
+            AssetBundleCreateRequestConfiguredSource nextNode;
+            public ref AssetBundleCreateRequestConfiguredSource NextNode => ref nextNode;
 
             static AssetBundleCreateRequestConfiguredSource()
             {
@@ -1307,7 +1315,8 @@ namespace Cysharp.Threading.Tasks
         sealed class UnityWebRequestAsyncOperationWithCancellationSource : IUniTaskSource<UnityWebRequest>, IPlayerLoopItem, ITaskPoolNode<UnityWebRequestAsyncOperationWithCancellationSource>
         {
             static TaskPool<UnityWebRequestAsyncOperationWithCancellationSource> pool;
-            public UnityWebRequestAsyncOperationWithCancellationSource NextNode { get; set; }
+            UnityWebRequestAsyncOperationWithCancellationSource nextNode;
+            public ref UnityWebRequestAsyncOperationWithCancellationSource NextNode => ref nextNode;
 
             static UnityWebRequestAsyncOperationWithCancellationSource()
             {
@@ -1438,7 +1447,8 @@ namespace Cysharp.Threading.Tasks
         sealed class UnityWebRequestAsyncOperationConfiguredSource : IUniTaskSource<UnityWebRequest>, IPlayerLoopItem, ITaskPoolNode<UnityWebRequestAsyncOperationConfiguredSource>
         {
             static TaskPool<UnityWebRequestAsyncOperationConfiguredSource> pool;
-            public UnityWebRequestAsyncOperationConfiguredSource NextNode { get; set; }
+            UnityWebRequestAsyncOperationConfiguredSource nextNode;
+            public ref UnityWebRequestAsyncOperationConfiguredSource NextNode => ref nextNode;
 
             static UnityWebRequestAsyncOperationConfiguredSource()
             {