1 #if NET_4_0 || BOOTSTRAP_NET_4_0
4 // Copyright (c) 2008 Jérémie "Garuma" Laval
6 // Permission is hereby granted, free of charge, to any person obtaining a copy
7 // of this software and associated documentation files (the "Software"), to deal
8 // in the Software without restriction, including without limitation the rights
9 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 // copies of the Software, and to permit persons to whom the Software is
11 // furnished to do so, subject to the following conditions:
13 // The above copyright notice and this permission notice shall be included in
14 // all copies or substantial portions of the Software.
16 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
27 using System.Collections.Concurrent;
29 namespace System.Threading.Tasks
31 internal class Scheduler: TaskScheduler, IScheduler
33 IProducerConsumerCollection<Task> workQueue;
34 ThreadWorker[] workers;
35 bool isPulsable = true;
38 : this (Environment.ProcessorCount, 0, ThreadPriority.Normal)
43 public Scheduler (int maxWorker, int maxStackSize, ThreadPriority priority)
45 workQueue = new ConcurrentQueue<Task> ();
46 workers = new ThreadWorker [maxWorker];
48 for (int i = 0; i < maxWorker; i++) {
49 workers [i] = new ThreadWorker (this, workers, workQueue, maxStackSize, priority);
53 public void AddWork (Task t)
55 // Add to the shared work pool
57 // Wake up some worker if they were asleep
61 public void ParticipateUntil (Task task)
63 if (AreTasksFinished (task))
66 ParticipateUntil (delegate {
67 return AreTasksFinished (task);
71 public bool ParticipateUntil (Task task, Func<bool> predicate)
73 if (AreTasksFinished (task))
76 bool isFromPredicate = false;
78 ParticipateUntil (delegate {
80 isFromPredicate = true;
83 return AreTasksFinished (task);
86 return isFromPredicate;
89 // Called with Task.WaitAll(someTasks) or Task.WaitAny(someTasks) so that we can remove ourselves
90 // also when our wait condition is ok
91 public void ParticipateUntil (Func<bool> predicate)
93 ThreadWorker.WorkerMethod (predicate, workQueue, workers);
96 public void PulseAll ()
99 foreach (ThreadWorker worker in workers) {
106 public void InhibitPulse ()
111 public void UnInhibitPulse ()
116 public void Dispose ()
118 foreach (ThreadWorker w in workers) {
123 bool AreTasksFinished (Task parent)
125 return parent.IsCompleted;
128 #region Scheduler dummy stubs
129 protected override System.Collections.Generic.IEnumerable<Task> GetScheduledTasks ()
131 throw new System.NotImplementedException();
134 protected internal override void QueueTask (Task task)
136 throw new System.NotImplementedException();
139 protected internal override bool TryDequeue (Task task)
141 throw new System.NotImplementedException();
144 protected override bool TryExecuteTaskInline (Task task, bool taskWasPreviouslyQueued)
146 throw new System.NotImplementedException();
149 public override int MaximumConcurrencyLevel {
151 return base.MaximumConcurrencyLevel;