mcs/class/corlib/System.Threading.Tasks/TpScheduler.cs

   1 // TpScheduler.cs
   2 //
   3 // Copyright (c) 2011 Jérémie "Garuma" Laval
   4 //
   5 // Permission is hereby granted, free of charge, to any person obtaining a copy
   6 // of this software and associated documentation files (the "Software"), to deal
   7 // in the Software without restriction, including without limitation the rights
   8 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   9 // copies of the Software, and to permit persons to whom the Software is
  10 // furnished to do so, subject to the following conditions:
  11 //
  12 // The above copyright notice and this permission notice shall be included in
  13 // all copies or substantial portions of the Software.
  14 //
  15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  18 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  21 // THE SOFTWARE.
  22 //
  23 //
  24
  25 #if NET_4_0 || MOBILE
  26 using System;
  27 using System.Collections.Concurrent;
  28
  29 namespace System.Threading.Tasks
  30 {
  31         internal class TpScheduler: TaskScheduler, IScheduler
  32         {
  33
  34                 public TpScheduler ()
  35                         : this (Environment.ProcessorCount, ThreadPriority.Normal)
  36                 {
  37                 }
  38
  39                 public TpScheduler (int maxWorker, ThreadPriority priority)
  40                 {
  41                 }
  42
  43                 public void AddWork (Task t)
  44                 {
  45                         ThreadPool.QueueUserWorkItem (_ => t.Execute (null));
  46                 }
  47
  48                 public void ParticipateUntil (Task task)
  49                 {
  50                         ParticipateUntil (task, new ManualResetEventSlim (false), -1);
  51                 }
  52
  53                 public bool ParticipateUntil (Task task, ManualResetEventSlim evt, int millisecondsTimeout)
  54                 {
  55                         if (task.IsCompleted)
  56                                 return false;
  57
  58                         bool isFromPredicate = true;
  59                         task.ContinueWith (_ => { isFromPredicate = false; evt.Set (); }, TaskContinuationOptions.ExecuteSynchronously);
  60
  61                         evt.Wait (millisecondsTimeout);
  62
  63                         return isFromPredicate;
  64                 }
  65
  66                 static bool TaskCompletedPredicate (Task self)
  67                 {
  68                         return self.IsCompleted;
  69                 }
  70
  71                 public void PulseAll ()
  72                 {
  73                 }
  74
  75                 public void Dispose ()
  76                 {
  77                 }
  78 #region Scheduler dummy stubs
  79                 protected override System.Collections.Generic.IEnumerable<Task> GetScheduledTasks ()
  80                 {
  81                         throw new System.NotImplementedException();
  82                 }
  83
  84                 protected internal override void QueueTask (Task task)
  85                 {
  86                         throw new System.NotImplementedException();
  87                 }
  88
  89                 protected internal override bool TryDequeue (Task task)
  90                 {
  91                         throw new System.NotImplementedException();
  92                 }
  93
  94                 protected override bool TryExecuteTaskInline (Task task, bool taskWasPreviouslyQueued)
  95                 {
  96                         task.Execute (null);
  97                         return true;
  98                 }
  99
 100                 public override int MaximumConcurrencyLevel {
 101                         get {
 102                                 return base.MaximumConcurrencyLevel;
 103                         }
 104                 }
 105 #endregion
 106         }
 107 }
 108 #endif