annotate Implab/Parallels/WorkerPool.cs @ 111:0fdaf280c797 v1

minor fix
author cin
date Wed, 19 Nov 2014 03:18:42 +0400
parents fe33f4e02ad5
children 4f20870d0816
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1 using System;
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2 using System.Collections.Generic;
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3 using System.Linq;
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4 using System.Text;
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5 using System.Threading;
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6 using System.Diagnostics;
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7 using Implab.Diagnostics;
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9 namespace Implab.Parallels {
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10 public class WorkerPool : DispatchPool<Action> {
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12 MTQueue<Action> m_queue = new MTQueue<Action>();
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13 int m_queueLength = 0;
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14 readonly int m_threshold = 1;
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16 public WorkerPool(int minThreads, int maxThreads, int threshold)
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17 : base(minThreads, maxThreads) {
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18 m_threshold = threshold;
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19 InitPool();
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20 }
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21
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22 public WorkerPool(int minThreads, int maxThreads) :
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23 base(minThreads, maxThreads) {
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24 InitPool();
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25 }
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27 public WorkerPool(int threads)
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28 : base(threads) {
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29 InitPool();
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30 }
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31
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32 public WorkerPool()
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33 : base() {
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34 InitPool();
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35 }
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36
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37 public Promise<T> Invoke<T>(Func<T> task) {
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38 if (task == null)
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39 throw new ArgumentNullException("task");
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40 if (IsDisposed)
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41 throw new ObjectDisposedException(ToString());
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43 var promise = new Promise<T>();
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45 var caller = TraceContext.Snapshot();
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46
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47 EnqueueTask(delegate() {
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48 caller.Invoke(delegate() {
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49 try {
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50 promise.Resolve(task());
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51 } catch (Exception e) {
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52 promise.Reject(e);
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53 }
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54 });
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55 });
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57 return promise;
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58 }
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59
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60 protected void EnqueueTask(Action unit) {
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61 Debug.Assert(unit != null);
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62 var len = Interlocked.Increment(ref m_queueLength);
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63 m_queue.Enqueue(unit);
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64
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65 if (len > m_threshold*ActiveThreads)
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66 GrowPool();
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67 }
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68
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69 protected override bool TryDequeue(out Action unit) {
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70 if (m_queue.TryDequeue(out unit)) {
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71 Interlocked.Decrement(ref m_queueLength);
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72 return true;
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73 }
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74 return false;
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75 }
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76
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77 protected override bool Suspend() {
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78 // This override solves race condition
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79 // WORKER CLIENT
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80 // ---------------------------------------
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81 // TryDeque == false
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82 // Enqueue(unit), queueLen++
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83 // GrowPool? == NO
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84 // ActiveThreads--
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85 // Suspend
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86 // queueLength > 0
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87 // continue
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88 if (m_queueLength > 0)
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89 return true;
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90 return base.Suspend();
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91 }
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92
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93 protected override void InvokeUnit(Action unit) {
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94 unit();
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95 }
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97 }
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98 }