annotate Implab/Parallels/DispatchPool.cs @ 101:279e226dffdd v2

code cleanup added EnsureDispatched extension
author cin
date Thu, 06 Nov 2014 20:03:19 +0300
parents dc4942d09e74
children f803565868a4
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1 using System;
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2 using System.Threading;
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3
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4 namespace Implab.Parallels {
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5 public abstract class DispatchPool<TUnit> : IDisposable {
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6 readonly int m_minThreadsLimit;
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7 readonly int m_maxThreadsLimit;
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8 readonly int m_releaseTimeout = 1000; // the timeout while the working thread will wait for the new tasks before exit
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9
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10 int m_threads; // the current size of the pool
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11 int m_maxRunningThreads; // the meximum reached size of the pool
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12 int m_exit; // the pool is going to shutdown, all unused workers are released
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13
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14 readonly object m_signal = new object(); // used to pulse waiting threads
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16 protected DispatchPool(int min, int max) {
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17 if (min < 0)
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18 throw new ArgumentOutOfRangeException("min");
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19 if (max <= 0)
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20 throw new ArgumentOutOfRangeException("max");
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21
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22 if (min > max)
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23 min = max;
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24 m_minThreadsLimit = min;
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25 m_maxThreadsLimit = max;
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26 }
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27
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28 protected DispatchPool(int threads)
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29 : this(threads, threads) {
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30 }
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31
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32 protected DispatchPool() {
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33 int maxThreads, maxCP;
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34 ThreadPool.GetMaxThreads(out maxThreads, out maxCP);
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35
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36 m_minThreadsLimit = 0;
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37 m_maxThreadsLimit = maxThreads;
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38 }
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39
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40 protected void InitPool() {
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41 for (int i = 0; i < m_minThreadsLimit; i++)
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42 StartWorker();
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43 }
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44
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45 public int PoolSize {
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46 get {
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47 Thread.MemoryBarrier();
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48 return m_threads;
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49 }
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50 }
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51
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52 public int MaxRunningThreads {
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53 get {
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54 Thread.MemoryBarrier();
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55 return m_maxRunningThreads;
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56 }
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57 }
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58
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59 protected bool IsDisposed {
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60 get {
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61 Thread.MemoryBarrier();
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62 return m_exit == 1;
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63 }
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64 }
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65
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66 protected abstract bool TryDequeue(out TUnit unit);
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67
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68 bool Dequeue(out TUnit unit, int timeout) {
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69 int ts = Environment.TickCount;
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70 if (TryDequeue(out unit))
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71 return true;
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72 lock (m_signal) {
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73 while (!TryDequeue(out unit) && m_exit == 0)
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74 if(!Monitor.Wait(m_signal, Math.Max(0, ts + timeout - Environment.TickCount))) {
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75 // timeout
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76 return false;
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77 }
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78 // queue item or terminate
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79 Monitor.Pulse(m_signal);
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80 if (m_exit == 1)
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81 return false;
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82 }
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83 return true;
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84 }
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85
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86 protected void SignalThread() {
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87 lock (m_signal) {
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88 Monitor.Pulse(m_signal);
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89 }
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90 }
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91
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92 #region thread slots traits
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93
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94 bool AllocateThreadSlot() {
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95 int current;
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96 // use spins to allocate slot for the new thread
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97 do {
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98 current = m_threads;
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99 if (current >= m_maxThreadsLimit || m_exit == 1)
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100 // no more slots left or the pool has been disposed
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101 return false;
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102 } while (current != Interlocked.CompareExchange(ref m_threads, current + 1, current));
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103
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104 UpdateMaxThreads(current + 1);
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105
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106 return true;
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107 }
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108
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109 bool AllocateThreadSlot(int desired) {
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110 if (desired - 1 != Interlocked.CompareExchange(ref m_threads, desired, desired - 1))
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111 return false;
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112
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113 UpdateMaxThreads(desired);
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114
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115 return true;
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116 }
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117
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118 bool ReleaseThreadSlot(out bool last) {
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119 last = false;
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120 int current;
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121 // use spins to release slot for the new thread
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122 Thread.MemoryBarrier();
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123 do {
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124 current = m_threads;
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125 if (current <= m_minThreadsLimit && m_exit == 0)
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126 // the thread is reserved
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127 return false;
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128 } while (current != Interlocked.CompareExchange(ref m_threads, current - 1, current));
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129
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130 last = (current == 1);
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131
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132 return true;
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133 }
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134
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135 void UpdateMaxThreads(int count) {
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136 int max;
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137 do {
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138 max = m_maxRunningThreads;
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139 if (max >= count)
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140 break;
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141 } while(max != Interlocked.CompareExchange(ref m_maxRunningThreads, count, max));
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142 }
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143
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144 #endregion
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145
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146 protected bool StartWorker() {
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147 if (AllocateThreadSlot()) {
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148 // slot successfully allocated
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149 var worker = new Thread(Worker);
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150 worker.IsBackground = true;
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151 worker.Start();
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152
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153 return true;
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154 }
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155 return false;
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156 }
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157
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158 protected abstract void InvokeUnit(TUnit unit);
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159
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160 protected virtual void Worker() {
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161 TUnit unit;
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162 bool last;
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163 do {
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164 while (Dequeue(out unit, m_releaseTimeout)) {
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165 InvokeUnit(unit);
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166 }
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167 if(!ReleaseThreadSlot(out last))
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168 continue;
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169 // queue may be not empty
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170 if (last && TryDequeue(out unit)) {
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171 InvokeUnit(unit);
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172 if (AllocateThreadSlot(1))
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173 continue;
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174 // we can safely exit since pool is alive
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175 }
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176 break;
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177 } while(true);
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178 }
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180
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181 protected virtual void Dispose(bool disposing) {
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182 if (disposing) {
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183 if (0 == Interlocked.CompareExchange(ref m_exit, 1, 0)) { // implies memory barrier
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184 // wake sleeping threads
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185 SignalThread();
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186 GC.SuppressFinalize(this);
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187 }
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188 }
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189 }
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190
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191 public void Dispose() {
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192 Dispose(true);
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193 }
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194
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195 ~DispatchPool() {
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196 Dispose(false);
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197 }
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198 }
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199 }