112 lines
3.5 KiB
C#
112 lines
3.5 KiB
C#
//
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// AsyncTaskMethodBuilder_T.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 AsyncTaskMethodBuilder<TResult>
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{
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readonly Task<TResult> task;
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IAsyncStateMachine stateMachine;
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private AsyncTaskMethodBuilder (Task<TResult> task)
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{
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this.task = task;
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this.stateMachine = null;
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}
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public Task<TResult> Task {
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get {
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return task;
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}
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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 AsyncTaskMethodBuilder<TResult> Create ()
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{
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var task = new Task<TResult> (TaskActionInvoker.Promise, null, CancellationToken.None, TaskCreationOptions.None, null);
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task.SetupScheduler (TaskScheduler.Current);
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return new AsyncTaskMethodBuilder<TResult> (task);
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}
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public void SetException (Exception exception)
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{
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if (Task.TrySetException (new AggregateException (exception), exception is OperationCanceledException, true))
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return;
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throw new InvalidOperationException ("The task has already completed");
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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 (TResult result)
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{
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if (!task.TrySetResult (result))
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throw new InvalidOperationException ("The task has already completed");
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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 |