140 lines
3.9 KiB
C#
140 lines
3.9 KiB
C#
// Scheduler.cs
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//
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// Copyright (c) 2008 Jérémie "Garuma" Laval
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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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//
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//
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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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using System.Threading.Tasks;
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using System.Collections.Concurrent;
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namespace Mono.Threading.Tasks
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{
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public class FixedTaskScheduler: TaskScheduler, IMonoTaskScheduler
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{
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readonly IProducerConsumerCollection<Task> workQueue;
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readonly ThreadWorker[] workers;
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readonly ManualResetEvent pulseHandle = new ManualResetEvent (false);
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public FixedTaskScheduler ()
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: this (Environment.ProcessorCount, ThreadPriority.Normal)
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{
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}
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public FixedTaskScheduler (int maxWorker, ThreadPriority priority)
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{
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workQueue = new ConcurrentQueue<Task> ();
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workers = new ThreadWorker [maxWorker];
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for (int i = 0; i < maxWorker; i++) {
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workers [i] = new ThreadWorker (workers, i, workQueue, new CyclicDeque<Task> (), priority, pulseHandle);
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workers [i].Pulse ();
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}
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}
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protected override void QueueTask (Task t)
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{
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// Add to the shared work pool
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workQueue.TryAdd (t);
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// Wake up some worker if they were asleep
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PulseAll ();
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}
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public void MonoParticipateUntil (Task task)
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{
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if (task.IsCompleted)
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return;
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ManualResetEventSlim evt = new ManualResetEventSlim (false);
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task.ContinueWith (_ => evt.Set (), TaskContinuationOptions.ExecuteSynchronously);
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if (evt.IsSet || task.IsCompleted)
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return;
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ParticipateUntilInternal (task, evt, -1);
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}
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public bool MonoParticipateUntil (Task task, ManualResetEventSlim evt, int millisecondsTimeout)
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{
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if (task.IsCompleted)
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return false;
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bool isFromPredicate = true;
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task.ContinueWith (_ => { isFromPredicate = false; evt.Set (); }, TaskContinuationOptions.ExecuteSynchronously);
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ParticipateUntilInternal (task, evt, millisecondsTimeout);
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if (task.IsCompleted)
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return false;
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return isFromPredicate;
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}
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public void ParticipateUntilInternal (Task self, ManualResetEventSlim evt, int millisecondsTimeout)
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{
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ThreadWorker.ParticipativeWorkerMethod (self, evt, millisecondsTimeout, workQueue, workers, pulseHandle, (a, b) => true);
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}
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static bool TaskCompletedPredicate (Task self)
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{
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return self.IsCompleted;
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}
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public void PulseAll ()
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{
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pulseHandle.Set ();
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}
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public void Dispose ()
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{
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foreach (ThreadWorker w in workers)
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w.Dispose ();
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}
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#region Scheduler dummy stubs
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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 override bool TryDequeue (Task task)
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{
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throw new System.NotImplementedException();
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}
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protected override bool TryExecuteTaskInline (Task task, bool taskWasPreviouslyQueued)
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{
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task.Execute (null);
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return true;
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}
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public override int MaximumConcurrencyLevel {
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get {
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return base.MaximumConcurrencyLevel;
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}
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}
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#endregion
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}
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}
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#endif
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