2 // SynchronizationContextScheduler.cs
5 // Jérémie "Garuma" Laval <jeremie.laval@gmail.com>
6 // Marek Safar <marek.safar@gmail.com>
8 // Copyright (c) 2011 Novell
9 // Copyright 2014 Xamarin Inc (http://www.xamarin.com).
11 // Permission is hereby granted, free of charge, to any person obtaining a copy
12 // of this software and associated documentation files (the "Software"), to deal
13 // in the Software without restriction, including without limitation the rights
14 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
15 // copies of the Software, and to permit persons to whom the Software is
16 // furnished to do so, subject to the following conditions:
18 // The above copyright notice and this permission notice shall be included in
19 // all copies or substantial portions of the Software.
21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
22 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
24 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
25 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
26 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
32 using System.Threading;
34 namespace System.Threading.Tasks
36 sealed class SynchronizationContextScheduler : TaskScheduler
38 readonly SynchronizationContext ctx;
39 readonly SendOrPostCallback callback;
41 public SynchronizationContextScheduler (SynchronizationContext ctx)
44 this.callback = TaskLaunchWrapper;
47 protected internal override void QueueTask (Task task)
49 ctx.Post (callback, task);
52 void TaskLaunchWrapper (object obj)
54 TryExecuteTask ((Task)obj);
57 protected override System.Collections.Generic.IEnumerable<Task> GetScheduledTasks ()
59 throw new System.NotImplementedException();
62 protected internal override bool TryDequeue (Task task)
67 protected override bool TryExecuteTaskInline (Task task, bool taskWasPreviouslyQueued)
69 return ctx == SynchronizationContext.Current && TryExecuteTask (task);
72 public override int MaximumConcurrencyLevel {