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annotate druntime/src/common/core/sync/barrier.d @ 1458:e0b2d67cfe7c

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Added druntime (this should be removed once it works).
author Robert Clipsham <robert@octarineparrot.com>
date Tue, 02 Jun 2009 17:43:06 +0100
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1458
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1 /**
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2 * The barrier module provides a primitive for synchronizing the progress of
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3 * a group of threads.
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4 *
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5 * Copyright: Copyright Sean Kelly 2005 - 2009.
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6 * License: <a href="http://www.boost.org/LICENSE_1_0.txt>Boost License 1.0</a>.
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7 * Authors: Sean Kelly
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8 *
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9 * Copyright Sean Kelly 2005 - 2009.
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10 * Distributed under the Boost Software License, Version 1.0.
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11 * (See accompanying file LICENSE_1_0.txt or copy at
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12 * http://www.boost.org/LICENSE_1_0.txt)
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13 */
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14 module core.sync.barrier;
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15
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16
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17 public import core.sync.exception;
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18 private import core.sync.condition;
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19 private import core.sync.mutex;
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20
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21 version( Win32 )
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22 {
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23 private import core.sys.windows.windows;
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24 }
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25 else version( Posix )
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26 {
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27 private import core.stdc.errno;
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28 private import core.sys.posix.pthread;
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29 }
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30
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31
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32 ////////////////////////////////////////////////////////////////////////////////
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33 // Barrier
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34 //
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35 // void wait();
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36 ////////////////////////////////////////////////////////////////////////////////
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37
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38
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39 /**
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40 * This class represents a barrier across which threads may only travel in
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41 * groups of a specific size.
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42 */
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43 class Barrier
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44 {
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45 ////////////////////////////////////////////////////////////////////////////
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46 // Initialization
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47 ////////////////////////////////////////////////////////////////////////////
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48
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49
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50 /**
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51 * Initializes a barrier object which releases threads in groups of limit
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52 * in size.
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53 *
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54 * Params:
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55 * limit = The number of waiting threads to release in unison.
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56 *
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57 * Throws:
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58 * SyncException on error.
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59 */
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60 this( uint limit )
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61 in
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62 {
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63 assert( limit > 0 );
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64 }
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65 body
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66 {
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67 m_lock = new Mutex;
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68 m_cond = new Condition( m_lock );
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69 m_group = 0;
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70 m_limit = limit;
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71 m_count = limit;
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72 }
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73
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74
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75 ////////////////////////////////////////////////////////////////////////////
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76 // General Actions
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77 ////////////////////////////////////////////////////////////////////////////
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78
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79
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80 /**
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81 * Wait for the pre-determined number of threads and then proceed.
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82 *
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83 * Throws:
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84 * SyncException on error.
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85 */
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86 void wait()
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87 {
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88 synchronized( m_lock )
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89 {
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90 uint group = m_group;
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91
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92 if( --m_count == 0 )
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93 {
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94 m_group++;
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95 m_count = m_limit;
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96 m_cond.notifyAll();
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97 }
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98 while( group == m_group )
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99 m_cond.wait();
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100 }
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101 }
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102
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103
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104 private:
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105 Mutex m_lock;
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106 Condition m_cond;
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107 uint m_group;
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108 uint m_limit;
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109 uint m_count;
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110 }
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111
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112
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113 ////////////////////////////////////////////////////////////////////////////////
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114 // Unit Tests
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115 ////////////////////////////////////////////////////////////////////////////////
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116
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117
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118 version( unittest )
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119 {
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120 private import core.thread;
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121
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122
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123 unittest
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124 {
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125 int numThreads = 10;
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126 auto barrier = new Barrier( numThreads );
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127 auto synInfo = new Object;
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128 int numReady = 0;
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129 int numPassed = 0;
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130
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131 void threadFn()
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132 {
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133 synchronized( synInfo )
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134 {
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135 ++numReady;
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136 }
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137 barrier.wait();
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138 synchronized( synInfo )
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139 {
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140 ++numPassed;
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141 }
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142 }
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143
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144 auto group = new ThreadGroup;
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145
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146 for( int i = 0; i < numThreads; ++i )
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147 {
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148 group.create( &threadFn );
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149 }
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150 group.joinAll();
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151 assert( numReady == numThreads && numPassed == numThreads );
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152 }
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153 }