76 lines
2.3 KiB
C#
76 lines
2.3 KiB
C#
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#if CSHARP_7_OR_LATER || (UNITY_2018_3_OR_NEWER && (NET_STANDARD_2_0 || NET_4_6))
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#pragma warning disable CS1591 // Missing XML comment for publicly visible type or member
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using System;
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using System.Threading;
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namespace UniRx.Async
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{
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public static class CancellationTokenExtensions
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{
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static readonly Action<object> cancellationTokenCallback = Callback;
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public static (UniTask, CancellationTokenRegistration) ToUniTask(this CancellationToken cts)
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{
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if (cts.IsCancellationRequested)
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{
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return (UniTask.FromCanceled(cts), default(CancellationTokenRegistration));
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}
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var promise = new UniTaskCompletionSource<AsyncUnit>();
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return (promise.Task, cts.RegisterWithoutCaptureExecutionContext(cancellationTokenCallback, promise));
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}
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static void Callback(object state)
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{
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var promise = (UniTaskCompletionSource<AsyncUnit>)state;
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promise.TrySetResult(AsyncUnit.Default);
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}
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public static CancellationTokenRegistration RegisterWithoutCaptureExecutionContext(this CancellationToken cancellationToken, Action callback)
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{
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var restoreFlow = false;
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if (!ExecutionContext.IsFlowSuppressed())
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{
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ExecutionContext.SuppressFlow();
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restoreFlow = true;
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}
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try
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{
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return cancellationToken.Register(callback, false);
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}
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finally
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{
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if (restoreFlow)
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{
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ExecutionContext.RestoreFlow();
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}
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}
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}
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public static CancellationTokenRegistration RegisterWithoutCaptureExecutionContext(this CancellationToken cancellationToken, Action<object> callback, object state)
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{
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var restoreFlow = false;
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if (!ExecutionContext.IsFlowSuppressed())
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{
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ExecutionContext.SuppressFlow();
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restoreFlow = true;
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}
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try
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{
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return cancellationToken.Register(callback, state, false);
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}
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finally
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{
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if (restoreFlow)
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{
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ExecutionContext.RestoreFlow();
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}
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}
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}
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}
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}
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#endif
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