Add UniTask.Never
parent
73a5ff6648
commit
c1f75d9ebd
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@ -175,6 +175,22 @@ namespace Cysharp.Threading.Tasks
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return new UniTask<T>(new DeferPromise<T>(factory), 0);
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}
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/// <summary>
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/// Never complete.
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/// </summary>
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public static UniTask Never(CancellationToken cancellationToken)
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{
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return new UniTask<AsyncUnit>(new NeverPromise<AsyncUnit>(cancellationToken), 0);
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}
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/// <summary>
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/// Never complete.
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/// </summary>
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public static UniTask<T> Never<T>(CancellationToken cancellationToken)
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{
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return new UniTask<T>(new NeverPromise<T>(cancellationToken), 0);
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}
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sealed class ExceptionResultSource : IUniTaskSource
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{
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readonly ExceptionDispatchInfo exception;
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@ -384,6 +400,54 @@ namespace Cysharp.Threading.Tasks
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return task.Status;
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}
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}
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sealed class NeverPromise<T> : IUniTaskSource<T>
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{
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static readonly Action<object> cancellationCallback = CancellationCallback;
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CancellationToken cancellationToken;
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UniTaskCompletionSourceCore<T> core;
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public NeverPromise(CancellationToken cancellationToken)
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{
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this.cancellationToken = cancellationToken;
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if (this.cancellationToken.CanBeCanceled)
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{
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this.cancellationToken.RegisterWithoutCaptureExecutionContext(cancellationCallback, this);
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}
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}
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static void CancellationCallback(object state)
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{
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var self = (NeverPromise<T>)state;
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self.core.TrySetCanceled(self.cancellationToken);
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}
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public T GetResult(short token)
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{
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return core.GetResult(token);
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}
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public UniTaskStatus GetStatus(short token)
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{
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return core.GetStatus(token);
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}
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public UniTaskStatus UnsafeGetStatus()
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{
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return core.UnsafeGetStatus();
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}
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public void OnCompleted(Action<object> continuation, object state, short token)
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{
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core.OnCompleted(continuation, state, token);
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}
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void IUniTaskSource.GetResult(short token)
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{
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core.GetResult(token);
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}
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}
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}
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internal static class CompletedTasks
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