81 lines
2.3 KiB
C#
81 lines
2.3 KiB
C#
//
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// SynchronizationContextScheduler.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) 2011 Novell
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// Copyright 2014 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 a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// 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, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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#if NET_4_0
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using System;
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using System.Threading;
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namespace System.Threading.Tasks
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{
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sealed class SynchronizationContextScheduler : TaskScheduler
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{
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readonly SynchronizationContext ctx;
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readonly SendOrPostCallback callback;
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public SynchronizationContextScheduler (SynchronizationContext ctx)
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{
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this.ctx = ctx;
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this.callback = TaskLaunchWrapper;
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}
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protected internal override void QueueTask (Task task)
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{
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ctx.Post (callback, task);
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}
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void TaskLaunchWrapper (object obj)
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{
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TryExecuteTask ((Task)obj);
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}
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protected override System.Collections.Generic.IEnumerable<Task> GetScheduledTasks ()
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{
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throw new System.NotImplementedException();
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}
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protected internal override bool TryDequeue (Task task)
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{
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return false;
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}
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protected override bool TryExecuteTaskInline (Task task, bool taskWasPreviouslyQueued)
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{
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return ctx == SynchronizationContext.Current && TryExecuteTask (task);
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}
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public override int MaximumConcurrencyLevel {
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get {
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return 1;
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}
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}
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}
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}
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#endif
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