111 lines
3.3 KiB
C#
111 lines
3.3 KiB
C#
//
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// AsyncVoidMethodBuilder.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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namespace System.Runtime.CompilerServices
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{
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public struct AsyncVoidMethodBuilder
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{
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static readonly SynchronizationContext null_context = new SynchronizationContext ();
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readonly SynchronizationContext context;
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IAsyncStateMachine stateMachine;
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private AsyncVoidMethodBuilder (SynchronizationContext context)
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{
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this.context = context;
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this.stateMachine = null;
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}
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public void AwaitOnCompleted<TAwaiter, TStateMachine> (ref TAwaiter awaiter, ref TStateMachine stateMachine)
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where TAwaiter : INotifyCompletion
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where TStateMachine : IAsyncStateMachine
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{
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var action = new Action (stateMachine.MoveNext);
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awaiter.OnCompleted (action);
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}
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public void AwaitUnsafeOnCompleted<TAwaiter, TStateMachine> (ref TAwaiter awaiter, ref TStateMachine stateMachine)
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where TAwaiter : ICriticalNotifyCompletion
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where TStateMachine : IAsyncStateMachine
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{
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var action = new Action (stateMachine.MoveNext);
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awaiter.UnsafeOnCompleted (action);
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}
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public static AsyncVoidMethodBuilder Create ()
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{
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var ctx = SynchronizationContext.Current ?? null_context;
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ctx.OperationStarted ();
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return new AsyncVoidMethodBuilder (ctx);
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}
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public void SetException (Exception exception)
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{
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if (exception == null)
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throw new ArgumentNullException ("exception");
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try {
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context.Post (l => { throw (Exception) l; }, exception);
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} finally {
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SetResult ();
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}
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}
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public void SetStateMachine (IAsyncStateMachine stateMachine)
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{
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if (stateMachine == null)
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throw new ArgumentNullException ("stateMachine");
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if (this.stateMachine != null)
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throw new InvalidOperationException ("The state machine was previously set");
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this.stateMachine = stateMachine;
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}
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public void SetResult ()
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{
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context.OperationCompleted ();
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}
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public void Start<TStateMachine> (ref TStateMachine stateMachine) where TStateMachine : IAsyncStateMachine
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{
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if (stateMachine == null)
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throw new ArgumentNullException ("stateMachine");
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stateMachine.MoveNext ();
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}
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}
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}
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#endif |