| | | 1 | | // Licensed to the .NET Foundation under one or more agreements. |
| | | 2 | | // The .NET Foundation licenses this file to you under the MIT license. |
| | | 3 | | |
| | | 4 | | using System; |
| | | 5 | | using System.Threading; |
| | | 6 | | using System.Threading.Tasks; |
| | | 7 | | |
| | | 8 | | namespace CoreWCF.Runtime |
| | | 9 | | { |
| | | 10 | | // This class is based on the blog post https://blogs.msdn.microsoft.com/pfxteam/2012/02/11/building-async-coordinat |
| | | 11 | | // move this to common folder - TODO Biroj |
| | | 12 | | public class AsyncManualResetEvent : IDisposable |
| | | 13 | | { |
| | 2362 | 14 | | private TaskCompletionSource<bool> _tcs = new TaskCompletionSource<bool>(TaskCreationOptions.RunContinuationsAsy |
| | | 15 | | |
| | | 16 | | public Task WaitAsync() |
| | | 17 | | { |
| | 2630 | 18 | | CheckDisposed(); |
| | 2630 | 19 | | return _tcs.Task; |
| | | 20 | | } |
| | | 21 | | |
| | | 22 | | public async Task<bool> WaitAsync(CancellationToken token) |
| | | 23 | | { |
| | 44 | 24 | | CheckDisposed(); |
| | | 25 | | |
| | 44 | 26 | | if (!token.CanBeCanceled) |
| | | 27 | | { |
| | 43 | 28 | | await WaitAsync(); |
| | 43 | 29 | | return true; |
| | | 30 | | } |
| | | 31 | | |
| | 1 | 32 | | if (token.IsCancellationRequested) |
| | | 33 | | { |
| | 0 | 34 | | return false; |
| | | 35 | | } |
| | | 36 | | |
| | 1 | 37 | | var localTcs = new TaskCompletionSource<bool>(); |
| | 1 | 38 | | using (token.Register(TokenCancelledCallback, localTcs)) |
| | | 39 | | { |
| | 1 | 40 | | TaskCompletionSource<bool> tcs = _tcs; |
| | 1 | 41 | | CheckDisposed(); |
| | 1 | 42 | | return await await Task.WhenAny(localTcs.Task, tcs.Task); |
| | | 43 | | } |
| | 44 | 44 | | } |
| | | 45 | | |
| | | 46 | | private static void TokenCancelledCallback(object obj) |
| | | 47 | | { |
| | 0 | 48 | | var localTcs = obj as TaskCompletionSource<bool>; |
| | 0 | 49 | | localTcs?.TrySetResult(false); |
| | 0 | 50 | | } |
| | | 51 | | |
| | | 52 | | public void Set() |
| | | 53 | | { |
| | 9634 | 54 | | CheckDisposed(); |
| | 9634 | 55 | | _tcs?.TrySetResult(true); |
| | 9634 | 56 | | } |
| | | 57 | | |
| | | 58 | | public void Reset() |
| | | 59 | | { |
| | 2630 | 60 | | CheckDisposed(); |
| | | 61 | | while (true) |
| | | 62 | | { |
| | 2631 | 63 | | TaskCompletionSource<bool> tcs = _tcs; |
| | 2631 | 64 | | if (tcs == null) |
| | | 65 | | { |
| | 0 | 66 | | return; // Disposed |
| | | 67 | | } |
| | | 68 | | |
| | 2631 | 69 | | if (!tcs.Task.IsCompleted || |
| | 2631 | 70 | | Interlocked.CompareExchange(ref _tcs, new TaskCompletionSource<bool>(TaskCreationOptions.RunContinuation |
| | | 71 | | { |
| | 2630 | 72 | | return; |
| | | 73 | | } |
| | | 74 | | } |
| | | 75 | | } |
| | | 76 | | |
| | | 77 | | private void CheckDisposed() |
| | | 78 | | { |
| | 14939 | 79 | | if (_tcs == null) |
| | | 80 | | { |
| | 0 | 81 | | throw new ObjectDisposedException(nameof(AsyncManualResetEvent)); |
| | | 82 | | } |
| | 14939 | 83 | | } |
| | | 84 | | |
| | | 85 | | public void Dispose() |
| | | 86 | | { |
| | 44 | 87 | | TaskCompletionSource<bool> tcs = Interlocked.Exchange(ref _tcs, null); |
| | 44 | 88 | | tcs?.TrySetResult(false); |
| | 44 | 89 | | } |
| | | 90 | | } |
| | | 91 | | } |