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annotate Implab/Parallels/DispatchPool.cs @ 24:ee04e1fa78da

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fixed dispatch pool race condition
author cin
date Thu, 14 Nov 2013 01:15:07 +0400
parents 5a35900264f5
children 2fad2d1f4b03
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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
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8 namespace Implab.Parallels {
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9 public abstract class DispatchPool<TUnit> : IDisposable {
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10 readonly int m_minThreads;
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11 readonly int m_maxThreads;
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12
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13 int m_createdThreads = 0; // the current size of the pool
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14 int m_activeThreads = 0; // the count of threads which are active
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15 int m_sleepingThreads = 0; // the count of currently inactive threads
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16 int m_maxRunningThreads = 0; // the meximum reached size of the pool
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17 int m_exitRequired = 0; // the pool is going to shutdown, all unused workers are released
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18 int m_releaseTimeout = 100; // the timeout while the working thread will wait for the new tasks before exit
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19 int m_wakeEvents = 0; // the count of wake events
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20
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21 AutoResetEvent m_hasTasks = new AutoResetEvent(false);
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22
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23 protected DispatchPool(int min, int max) {
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24 if (min < 0)
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25 throw new ArgumentOutOfRangeException("min");
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26 if (max <= 0)
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27 throw new ArgumentOutOfRangeException("max");
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28
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29 if (min > max)
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30 min = max;
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31 m_minThreads = min;
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32 m_maxThreads = max;
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33 }
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34
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35 protected DispatchPool(int threads)
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36 : this(threads, threads) {
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37 }
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38
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39 protected DispatchPool() {
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40 int maxThreads, maxCP;
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41 ThreadPool.GetMaxThreads(out maxThreads, out maxCP);
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42
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43 m_minThreads = 0;
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44 m_maxThreads = maxThreads;
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45 }
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46
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47 protected void InitPool() {
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48 for (int i = 0; i < m_minThreads; i++)
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49 StartWorker();
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50 }
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51
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52 public int PoolSize {
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53 get {
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54 return m_createdThreads;
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55 }
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56 }
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57
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58 public int ActiveThreads {
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59 get {
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60 return m_activeThreads;
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61 }
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62 }
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63
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64 public int MaxRunningThreads {
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65 get {
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66 return m_maxRunningThreads;
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67 }
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68 }
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69
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70 protected bool IsDisposed {
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71 get {
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72 return m_exitRequired != 0;
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73 }
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74 }
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75
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76 protected abstract bool TryDequeue(out TUnit unit);
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77
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78 #region thread execution traits
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79 int SignalThread() {
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80 var signals = Interlocked.Increment(ref m_wakeEvents);
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81 if(signals == 1)
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82 m_hasTasks.Set();
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83 return signals;
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84 }
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85
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86 bool FetchSignalOrWait(int timeout) {
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87 var start = Environment.TickCount;
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88
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89 // означает, что поток владеет блокировкой и при успешном получении сигнала должен
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90 // ее вернуть, чтобы другой ожидающий поток смог
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91 bool hasLock = false;
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92 do {
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93 int signals;
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94 do {
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95 signals = m_wakeEvents;
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96 if (signals == 0)
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97 break;
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98 } while (Interlocked.CompareExchange(ref m_wakeEvents, signals - 1, signals) != signals);
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99
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100 if (signals >= 1) {
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101 if (signals > 1 && hasLock)
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102 m_hasTasks.Set();
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103 return true;
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104 }
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105
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106 if (timeout != -1)
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107 timeout = Math.Max(0, timeout - (Environment.TickCount - start));
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108
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109 // если сигналов больше не осталось, то первый поток, который дошел сюда сбросит событие
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110 // и уйдет на пустой цикл, после чего заблокируется
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111
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112 hasLock = true;
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113 } while (m_hasTasks.WaitOne(timeout));
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114
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115 return false;
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116 }
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117
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118 bool Sleep(int timeout) {
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119 Interlocked.Increment(ref m_sleepingThreads);
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120 if (FetchSignalOrWait(timeout)) {
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121 Interlocked.Decrement(ref m_sleepingThreads);
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122 return true;
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123 } else {
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124 Interlocked.Decrement(ref m_sleepingThreads);
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125 return false;
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126 }
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127 }
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128 #endregion
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129
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130 /// <summary>
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131 /// Запускает либо новый поток, если раньше не было ни одного потока, либо устанавливает событие пробуждение одного спящего потока
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132 /// </summary>
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133 protected void GrowPool() {
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134 if (m_exitRequired != 0)
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135 return;
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136 if (m_sleepingThreads > m_wakeEvents) {
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137 //Console.WriteLine("Waking threads (sleeps {0}, pending {1})", m_sleepingThreads, m_wakeEvents);
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138
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139 // all sleeping threads may gone
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140 SignalThread(); // wake a sleeping thread;
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141
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142 // we can't check whether signal has been processed
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143 // anyway it may take some time for the thread to start
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144 // we will ensure that at least one thread is running
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145
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146 if (AllocateThreadSlot(1)) {
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147 // if there were no threads in the pool
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148 var worker = new Thread(this.Worker);
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149 worker.IsBackground = true;
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150 worker.Start();
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151 }
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152 } else {
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153 // if there is no sleeping threads in the pool
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154 if (!StartWorker())
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155 // we haven't started a new thread, but the current can be on the way and it can't process the queue
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156 // send it a signal to spin again
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157 SignalThread();
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158 }
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159 }
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160
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161 private bool Suspend() {
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162 //no tasks left, exit if the thread is no longer needed
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163 bool last;
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164 bool requestExit;
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165
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166 // if threads have a timeout before releasing
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167 if (m_releaseTimeout > 0)
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168 requestExit = !Sleep(m_releaseTimeout);
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169 else
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170 requestExit = true;
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171
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172 if (!requestExit)
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173 return true;
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174
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175 // release unsused thread
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176 if (requestExit && ReleaseThreadSlot(out last)) {
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177 // in case at the moment the last thread was being released
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178 // a new task was added to the queue, we need to try
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179 // to revoke the thread to avoid the situation when the task is left unprocessed
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180 if (last && Sleep(0)) { // Sleep(0) will fetch pending task or will return false
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181 if (AllocateThreadSlot(1))
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182 return true; // spin again...
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183 else
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184 SignalThread(); // since Sleep(0) has fetched the signal we neet to reschedule it
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185
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186 }
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187
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188 return false;
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189 }
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190
21
6a56df4ec59e DispatchPool works again, but performance is poor in some cases
cin
parents: 20
diff changeset
191 // wait till infinity
20
1c3b3d518480 refactoring, sync
cin
parents: 17
diff changeset
192 Sleep(-1);
1c3b3d518480 refactoring, sync
cin
parents: 17
diff changeset
193
1c3b3d518480 refactoring, sync
cin
parents: 17
diff changeset
194 return true;
17
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
195 }
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
196
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
197 #region thread slots traits
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
198
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
199 bool AllocateThreadSlot() {
16
cin
parents: 15
diff changeset
200 int current;
15
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
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201 // use spins to allocate slot for the new thread
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
202 do {
20
1c3b3d518480 refactoring, sync
cin
parents: 17
diff changeset
203 current = m_createdThreads;
15
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
204 if (current >= m_maxThreads || m_exitRequired != 0)
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
205 // no more slots left or the pool has been disposed
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
206 return false;
20
1c3b3d518480 refactoring, sync
cin
parents: 17
diff changeset
207 } while (current != Interlocked.CompareExchange(ref m_createdThreads, current + 1, current));
15
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
208
17
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
209 UpdateMaxThreads(current + 1);
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
210
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
211 return true;
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
212 }
15
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
213
17
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
214 bool AllocateThreadSlot(int desired) {
20
1c3b3d518480 refactoring, sync
cin
parents: 17
diff changeset
215 if (desired - 1 != Interlocked.CompareExchange(ref m_createdThreads, desired, desired - 1))
17
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
216 return false;
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
217
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
218 UpdateMaxThreads(desired);
15
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
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219
17
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
220 return true;
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
221 }
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
222
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
223 bool ReleaseThreadSlot(out bool last) {
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
224 last = false;
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
225 int current;
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
226 // use spins to release slot for the new thread
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
227 do {
20
1c3b3d518480 refactoring, sync
cin
parents: 17
diff changeset
228 current = m_createdThreads;
17
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
229 if (current <= m_minThreads && m_exitRequired == 0)
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
230 // the thread is reserved
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
231 return false;
20
1c3b3d518480 refactoring, sync
cin
parents: 17
diff changeset
232 } while (current != Interlocked.CompareExchange(ref m_createdThreads, current - 1, current));
17
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
233
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
234 last = (current == 1);
15
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
235
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
236 return true;
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
237 }
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
238
17
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
239 /// <summary>
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cin
parents: 16
diff changeset
240 /// releases thread slot unconditionally, used during cleanup
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
241 /// </summary>
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
242 /// <returns>true - no more threads left</returns>
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cin
parents: 16
diff changeset
243 bool ReleaseThreadSlotAnyway() {
20
1c3b3d518480 refactoring, sync
cin
parents: 17
diff changeset
244 var left = Interlocked.Decrement(ref m_createdThreads);
17
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
245 return left == 0;
15
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
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246 }
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
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247
17
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
248 void UpdateMaxThreads(int count) {
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
249 int max;
16
cin
parents: 15
diff changeset
250 do {
17
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
251 max = m_maxRunningThreads;
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
252 if (max >= count)
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
253 break;
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
254 } while(max != Interlocked.CompareExchange(ref m_maxRunningThreads, count, max));
16
cin
parents: 15
diff changeset
255 }
cin
parents: 15
diff changeset
256
17
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
257 #endregion
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
258
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
259 bool StartWorker() {
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
260 if (AllocateThreadSlot()) {
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
261 // slot successfully allocated
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
262 var worker = new Thread(this.Worker);
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
263 worker.IsBackground = true;
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
264 worker.Start();
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
265
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
266 return true;
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
267 } else {
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
268 return false;
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
269 }
16
cin
parents: 15
diff changeset
270 }
cin
parents: 15
diff changeset
271
21
6a56df4ec59e DispatchPool works again, but performance is poor in some cases
cin
parents: 20
diff changeset
272 protected abstract void InvokeUnit(TUnit unit);
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cin
parents: 20
diff changeset
273
6a56df4ec59e DispatchPool works again, but performance is poor in some cases
cin
parents: 20
diff changeset
274 void Worker() {
6a56df4ec59e DispatchPool works again, but performance is poor in some cases
cin
parents: 20
diff changeset
275 TUnit unit;
22
5a35900264f5 implemented nonblocking wake singnals processing
cin
parents: 21
diff changeset
276 //Console.WriteLine("{0}: Active", Thread.CurrentThread.ManagedThreadId);
21
6a56df4ec59e DispatchPool works again, but performance is poor in some cases
cin
parents: 20
diff changeset
277 Interlocked.Increment(ref m_activeThreads);
15
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
278 do {
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
279 // exit if requested
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
280 if (m_exitRequired != 0) {
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
281 // release the thread slot
20
1c3b3d518480 refactoring, sync
cin
parents: 17
diff changeset
282 Interlocked.Decrement(ref m_activeThreads);
17
7cd4a843b4e4 Improved worker pool
cin
parents: 16
diff changeset
283 if (ReleaseThreadSlotAnyway()) // it was the last worker
15
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
284 m_hasTasks.Dispose();
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
285 else
21
6a56df4ec59e DispatchPool works again, but performance is poor in some cases
cin
parents: 20
diff changeset
286 SignalThread(); // wake next worker
6a56df4ec59e DispatchPool works again, but performance is poor in some cases
cin
parents: 20
diff changeset
287 break;
15
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
288 }
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
289
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
290 // fetch task
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
291 if (TryDequeue(out unit)) {
21
6a56df4ec59e DispatchPool works again, but performance is poor in some cases
cin
parents: 20
diff changeset
292 InvokeUnit(unit);
6a56df4ec59e DispatchPool works again, but performance is poor in some cases
cin
parents: 20
diff changeset
293 continue;
15
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
294 }
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
295
20
1c3b3d518480 refactoring, sync
cin
parents: 17
diff changeset
296 Interlocked.Decrement(ref m_activeThreads);
15
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
297
16
cin
parents: 15
diff changeset
298 // entering suspend state
cin
parents: 15
diff changeset
299 // keep this thread and wait
20
1c3b3d518480 refactoring, sync
cin
parents: 17
diff changeset
300 if (!Suspend())
21
6a56df4ec59e DispatchPool works again, but performance is poor in some cases
cin
parents: 20
diff changeset
301 break;
22
5a35900264f5 implemented nonblocking wake singnals processing
cin
parents: 21
diff changeset
302 //Console.WriteLine("{0}: Awake", Thread.CurrentThread.ManagedThreadId);
20
1c3b3d518480 refactoring, sync
cin
parents: 17
diff changeset
303 Interlocked.Increment(ref m_activeThreads);
15
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
304 } while (true);
22
5a35900264f5 implemented nonblocking wake singnals processing
cin
parents: 21
diff changeset
305 //Console.WriteLine("{0}: Exited", Thread.CurrentThread.ManagedThreadId);
15
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
306 }
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
307
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
308 protected virtual void Dispose(bool disposing) {
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
309 if (disposing) {
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
310 if (m_exitRequired == 0) {
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
311 if (Interlocked.CompareExchange(ref m_exitRequired, 1, 0) != 0)
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
312 return;
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
313
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
314 // wake sleeping threads
21
6a56df4ec59e DispatchPool works again, but performance is poor in some cases
cin
parents: 20
diff changeset
315 if (m_createdThreads > 0)
6a56df4ec59e DispatchPool works again, but performance is poor in some cases
cin
parents: 20
diff changeset
316 SignalThread();
6a56df4ec59e DispatchPool works again, but performance is poor in some cases
cin
parents: 20
diff changeset
317 else
6a56df4ec59e DispatchPool works again, but performance is poor in some cases
cin
parents: 20
diff changeset
318 m_hasTasks.Dispose();
15
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
319 GC.SuppressFinalize(this);
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
320 }
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
321 }
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
322 }
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
323
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
324 public void Dispose() {
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
325 Dispose(true);
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
326 }
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
327
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
328 ~DispatchPool() {
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
329 Dispose(false);
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
330 }
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
331 }
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents:
diff changeset
332 }