97 lines
2.6 KiB
C#
97 lines
2.6 KiB
C#
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//
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// YieldAwaitable.cs
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//
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// Authors:
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// Marek Safar <marek.safar@gmail.com>
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//
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// Copyright (C) 2011 Novell, Inc (http://www.novell.com)
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// Copyright (C) 2011 Xamarin, Inc (http://www.xamarin.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,)
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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#if NET_4_5
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using System.Threading;
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using System.Threading.Tasks;
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namespace System.Runtime.CompilerServices
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{
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public struct YieldAwaitable
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{
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public struct YieldAwaiter : ICriticalNotifyCompletion
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{
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public bool IsCompleted {
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get {
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return false;
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}
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}
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public void OnCompleted (Action continuation)
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{
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OnCompleted (continuation, false);
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}
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public void UnsafeOnCompleted (Action continuation)
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{
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OnCompleted (continuation, true);
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}
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void OnCompleted (Action continuation, bool isUnsafe)
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{
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if (continuation == null)
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throw new ArgumentNullException ("continuation");
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var ctx = SynchronizationContext.Current;
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if (ctx != null && ctx.GetType () != typeof (SynchronizationContext)) {
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ctx.Post (l => ((Action) l) (), continuation);
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return;
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}
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if (TaskScheduler.IsDefault) {
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//
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// Pass continuation as an argument to avoid allocating
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// hoisting class
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//
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WaitCallback callBack = l => ((Action) l) ();
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if (isUnsafe) {
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ThreadPool.UnsafeQueueUserWorkItem (callBack, continuation);
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} else {
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ThreadPool.QueueUserWorkItem (callBack, continuation);
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}
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return;
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}
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new Task (continuation).Start (TaskScheduler.Current);
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}
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public void GetResult ()
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{
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}
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}
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public YieldAwaitable.YieldAwaiter GetAwaiter ()
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{
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return new YieldAwaiter ();
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}
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}
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}
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#endif
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