98 lines
3.3 KiB
C#
98 lines
3.3 KiB
C#
//
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// TaskExtensionsImpl.cs
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//
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// Authors:
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// Jérémie "Garuma" Laval <jeremie.laval@gmail.com>
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// Marek Safar (marek.safar@gmail.com)
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//
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// Copyright (c) 2010 Jérémie "Garuma" Laval
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// Copyright (C) 2013 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_0
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namespace System.Threading.Tasks
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{
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static class TaskExtensionsImpl
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{
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const TaskContinuationOptions options = TaskContinuationOptions.ExecuteSynchronously;
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public static Task<TResult> Unwrap<TResult> (Task<Task<TResult>> task)
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{
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var src = new TaskCompletionSource<TResult> ();
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task.ContinueWith ((t, arg) => Cont (t, (TaskCompletionSource<TResult>) arg), src, CancellationToken.None, options, TaskScheduler.Current);
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return src.Task;
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}
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public static Task Unwrap (Task<Task> task)
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{
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var src = new TaskCompletionSource<object> ();
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task.ContinueWith ((t, arg) => Cont (t, (TaskCompletionSource<object>) arg), src, CancellationToken.None, options, TaskScheduler.Current);
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return src.Task;
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}
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static void SetResult (Task source, TaskCompletionSource<object> dest)
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{
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if (source.IsCanceled)
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dest.SetCanceled ();
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else if (source.IsFaulted)
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dest.SetException (source.Exception.InnerExceptions);
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else
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dest.SetResult (null);
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}
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static void Cont (Task<Task> source, TaskCompletionSource<object> dest)
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{
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if (source.IsCanceled)
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dest.SetCanceled ();
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else if (source.IsFaulted)
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dest.SetException (source.Exception.InnerExceptions);
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else
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source.Result.ContinueWith ((t, arg) => SetResult (t, (TaskCompletionSource<object>) arg), dest, CancellationToken.None, options, TaskScheduler.Current);
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}
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static void SetResult<TResult> (Task<TResult> source, TaskCompletionSource<TResult> dest)
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{
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if (source.IsCanceled)
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dest.SetCanceled ();
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else if (source.IsFaulted)
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dest.SetException (source.Exception.InnerExceptions);
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else
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dest.SetResult (source.Result);
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}
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static void Cont<TResult> (Task<Task<TResult>> source, TaskCompletionSource<TResult> dest)
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{
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if (source.IsCanceled)
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dest.SetCanceled ();
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else if (source.IsFaulted)
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dest.SetException (source.Exception.InnerExceptions);
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else
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source.Result.ContinueWith ((t, arg) => SetResult (t, (TaskCompletionSource<TResult>) arg), dest, CancellationToken.None, options, TaskScheduler.Current);
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}
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}
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}
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#endif
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