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1 /*******************************************************************************
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2 copyright: Copyright (c) 2006 Juan Jose Comellas. All rights reserved
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3 license: BSD style: $(LICENSE)
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4 author: Juan Jose Comellas <juanjo@comellas.com.ar>
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5 Converted to use core.sync by Sean Kelly <sean@f4.ca>
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6 *******************************************************************************/
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7
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8 private import tango.core.sync.ReadWriteMutex;
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9 private import tango.core.sync.Mutex;
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10 private import tango.core.Thread;
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11 private import tango.text.convert.Integer;
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12 debug (readwritemutex)
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13 {
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14 private import tango.util.log.Log;
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15 private import tango.util.log.ConsoleAppender;
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16 private import tango.util.log.DateLayout;
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17 }
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18
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19
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20 /**
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21 * Example program for the tango.core.sync.ReadWriteMutex module.
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22 */
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23 void main(char[][] args)
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24 {
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25 const uint ReaderThreads = 100;
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26 const uint WriterThreads = 20;
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27 const uint LoopsPerReader = 10000;
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28 const uint LoopsPerWriter = 1000;
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29 const uint CounterIncrement = 3;
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30
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31 debug (readwritemutex)
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32 {
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33 Logger log = Log.getLogger("readwritemutex");
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34
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35 log.addAppender(new ConsoleAppender(new DateLayout()));
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36
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37 log.info("ReadWriteMutex test");
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38 }
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39
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40 ReadWriteMutex rwlock = new ReadWriteMutex();
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41 Mutex mutex = new Mutex();
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42 uint readCount = 0;
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43 uint passed = 0;
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44 uint failed = 0;
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45
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46 void mutexReaderThread()
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47 {
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48 debug (readwritemutex)
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49 {
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50 Logger log = Log.getLogger("readwritemutex." ~ Thread.getThis().name());
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51
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52 log.trace("Starting reader thread");
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53 }
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54
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55 for (uint i = 0; i < LoopsPerReader; ++i)
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56 {
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57 // All the reader threads acquire the mutex for reading and when they are
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58 // all done
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59 synchronized (rwlock.reader)
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60 {
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61 for (uint j = 0; j < CounterIncrement; ++j)
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62 {
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63 synchronized (mutex)
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64 {
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65 ++readCount;
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66 }
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67 }
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68 }
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69 }
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70 }
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71
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72 void mutexWriterThread()
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73 {
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74 debug (readwritemutex)
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75 {
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76 Logger log = Log.getLogger("readwritemutex." ~ Thread.getThis().name());
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77
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78 log.trace("Starting writer thread");
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79 }
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80
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81 for (uint i = 0; i < LoopsPerWriter; ++i)
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82 {
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83 synchronized (rwlock.writer)
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84 {
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85 synchronized (mutex)
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86 {
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87 if (readCount % 3 == 0)
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88 {
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89 ++passed;
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90 }
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91 }
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92 }
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93 }
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94 }
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95
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96 ThreadGroup group = new ThreadGroup();
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97 Thread thread;
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98 char[10] tmp;
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99
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100 for (uint i = 0; i < ReaderThreads; ++i)
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101 {
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102 thread = new Thread(&mutexReaderThread);
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103 thread.name = "reader-" ~ format(tmp, i);
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104
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105 debug (readwritemutex)
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106 log.trace("Created reader thread " ~ thread.name);
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107 thread.start();
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108
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109 group.add(thread);
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110 }
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111
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112 for (uint i = 0; i < WriterThreads; ++i)
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113 {
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114 thread = new Thread(&mutexWriterThread);
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115 thread.name = "writer-" ~ format(tmp, i);
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116
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117 debug (readwritemutex)
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118 log.trace("Created writer thread " ~ thread.name);
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119 thread.start();
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120
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121 group.add(thread);
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122 }
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123
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124 debug (readwritemutex)
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125 log.trace("Waiting for threads to finish");
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126 group.joinAll();
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127
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128 if (passed == WriterThreads * LoopsPerWriter)
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129 {
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130 debug (readwritemutex)
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131 log.info("The ReadWriteMutex test was successful");
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132 }
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133 else
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134 {
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135 debug (readwritemutex)
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136 {
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137 log.error("The ReadWriteMutex is not working properly: the counter has an incorrect value");
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138 assert(false);
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139 }
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140 else
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141 {
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142 assert(false, "The ReadWriteMutex is not working properly: the counter has an incorrect value");
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143 }
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144 }
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145 }
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