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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.Mutex;
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9 private import tango.core.Exception;
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10 private import tango.core.Thread;
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11 private import tango.io.Stdout;
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12 private import tango.text.convert.Integer;
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13 debug (mutex)
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14 {
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15 private import tango.util.log.Log;
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16 private import tango.util.log.ConsoleAppender;
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17 private import tango.util.log.DateLayout;
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18 }
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19
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20
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21 /**
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22 * Example program for the tango.core.sync.Mutex module.
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23 */
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24 void main(char[][] args)
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25 {
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26 debug (mutex)
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27 {
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28 Logger log = Log.getLogger("mutex");
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29
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30 log.addAppender(new ConsoleAppender(new DateLayout()));
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31
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32 log.info("Mutex test");
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33 }
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34
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35 testNonRecursive();
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36 testLocking();
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37 testRecursive();
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38 }
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39
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40 /**
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41 * Test that non-recursive mutexes actually do what they're supposed to do.
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42 *
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43 * Remarks:
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44 * Windows only supports recursive mutexes.
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45 */
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46 void testNonRecursive()
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47 {
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48 version (Posix)
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49 {
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50 debug (mutex)
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51 {
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52 Logger log = Log.getLogger("mutex.non-recursive");
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53 }
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54
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55 Mutex mutex = new Mutex(Mutex.Type.NonRecursive);
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56 bool couldLock;
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57
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58 try
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59 {
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60 mutex.lock();
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61 debug (mutex)
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62 log.trace("Acquired mutex");
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63 couldLock = mutex.tryLock();
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64 if (couldLock)
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65 {
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66 debug (mutex)
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67 {
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68 log.trace("Re-acquired mutex");
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69 log.trace("Releasing mutex");
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70 }
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71 mutex.unlock();
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72 }
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73 else
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74 {
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75 debug (mutex)
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76 log.trace("Re-acquiring the mutex failed");
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77 }
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78 debug (mutex)
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79 log.trace("Releasing mutex");
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80 mutex.unlock();
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81 }
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82 catch (SyncException e)
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83 {
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84 Stderr.formatln("Sync exception caught when testing non-recursive mutexes:\n{0}\n", e.toString());
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85 }
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86 catch (Exception e)
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87 {
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88 Stderr.formatln("Unexpected exception caught when testing non-recursive mutexes:\n{0}\n", e.toString());
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89 }
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90
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91 if (!couldLock)
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92 {
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93 debug (mutex)
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94 log.info("The non-recursive Mutex test was successful");
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95 }
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96 else
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97 {
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98 debug (mutex)
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99 {
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100 log.error("Non-recursive mutexes are not working: "
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101 "Mutex.tryAcquire() did not fail on an already acquired mutex");
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102 assert(false);
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103 }
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104 else
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105 {
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106 assert(false, "Non-recursive mutexes are not working: "
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107 "Mutex.tryAcquire() did not fail on an already acquired mutex");
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108 }
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109 }
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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 * Create several threads that acquire and release a mutex several times.
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115 */
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116 void testLocking()
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117 {
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118 const uint MaxThreadCount = 10;
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119 const uint LoopsPerThread = 1000;
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120
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121 debug (mutex)
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122 {
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123 Logger log = Log.getLogger("mutex.locking");
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124 }
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125
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126 Mutex mutex = new Mutex();
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127 uint lockCount = 0;
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128
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129 void mutexLockingThread()
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130 {
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131 try
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132 {
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133 for (uint i; i < LoopsPerThread; i++)
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134 {
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135 synchronized (mutex)
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136 {
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137 lockCount++;
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138 }
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139 }
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140 }
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141 catch (SyncException e)
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142 {
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143 Stderr.formatln("Sync exception caught inside mutex testing thread:\n{0}\n", e.toString());
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144 }
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145 catch (Exception e)
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146 {
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147 Stderr.formatln("Unexpected exception caught inside mutex testing thread:\n{0}\n", e.toString());
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148 }
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149 }
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150
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151 ThreadGroup group = new ThreadGroup();
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152 Thread thread;
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153 char[10] tmp;
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154
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155 for (uint i = 0; i < MaxThreadCount; i++)
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156 {
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157 thread = new Thread(&mutexLockingThread);
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158 thread.name = "thread-" ~ format(tmp, i);
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159
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160 debug (mutex)
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161 log.trace("Created thread " ~ thread.name);
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162 thread.start();
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163
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164 group.add(thread);
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165 }
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166
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167 debug (mutex)
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168 log.trace("Waiting for threads to finish");
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169 group.joinAll();
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170
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171 if (lockCount == MaxThreadCount * LoopsPerThread)
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172 {
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173 debug (mutex)
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174 log.info("The Mutex locking test was successful");
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175 }
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176 else
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177 {
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178 debug (mutex)
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179 {
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180 log.error("Mutex locking is not working properly: "
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181 "the number of times the mutex was acquired is incorrect");
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182 assert(false);
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183 }
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184 else
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185 {
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186 assert(false,"Mutex locking is not working properly: "
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187 "the number of times the mutex was acquired is incorrect");
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188 }
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189 }
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190 }
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191
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192 /**
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193 * Test that recursive mutexes actually do what they're supposed to do.
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194 */
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195 void testRecursive()
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196 {
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197 const uint LoopsPerThread = 1000;
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198
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199 debug (mutex)
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200 {
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201 Logger log = Log.getLogger("mutex.recursive");
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202 }
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203
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204 Mutex mutex = new Mutex;
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205 uint lockCount = 0;
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206
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207 try
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208 {
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209 for (uint i = 0; i < LoopsPerThread; i++)
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210 {
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211 mutex.lock();
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212 lockCount++;
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213 }
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214 }
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215 catch (SyncException e)
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216 {
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217 Stderr.formatln("Sync exception caught in recursive mutex test:\n{0}\n", e.toString());
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218 }
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219 catch (Exception e)
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220 {
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221 Stderr.formatln("Unexpected exception caught in recursive mutex test:\n{0}\n", e.toString());
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222 }
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223
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224 for (uint i = 0; i < lockCount; i++)
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225 {
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226 mutex.unlock();
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227 }
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228
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229 if (lockCount == LoopsPerThread)
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230 {
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231 debug (mutex)
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232 log.info("The recursive Mutex test was successful");
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233 }
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234 else
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235 {
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236 debug (mutex)
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237 {
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238 log.error("Recursive mutexes are not working: "
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239 "the number of times the mutex was acquired is incorrect");
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240 assert(false);
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241 }
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242 else
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243 {
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244 assert(false, "Recursive mutexes are not working: "
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245 "the number of times the mutex was acquired is incorrect");
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246 }
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247 }
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248 }
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