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annotate runtime/internal/monitor.c @ 443:44f08170f4ef

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Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn. Reworked the LLVMDC specific pragmas.
author Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
date Fri, 01 Aug 2008 00:32:06 +0200
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children f478666f5b96
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443
44f08170f4ef Removed tango from the repository and instead added a runtime dir with the files needed to patch and build tango from svn.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
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1 // D programming language runtime library
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2 // Public Domain
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3 // written by Walter Bright, Digital Mars
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4 // www.digitalmars.com
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5
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6 // This is written in C because nobody has written a pthreads interface
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7 // to D yet.
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8
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9
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10 #include <stdio.h>
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11 #include <stdlib.h>
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12 #include <assert.h>
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13
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14 #if _WIN32
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15 #elif linux
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16 #define USE_PTHREADS 1
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17 #else
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18 #endif
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19
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20 #if _WIN32
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21 #include <windows.h>
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22 #endif
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23
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24 #if USE_PTHREADS
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25 #include <pthread.h>
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26 #endif
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27
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28 #include "mars.h"
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29
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30 // This is what the monitor reference in Object points to
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31 typedef struct Monitor
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32 {
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33 void* impl; // for user-level monitors
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34 Array devt; // for internal monitors
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35
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36 #if _WIN32
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37 CRITICAL_SECTION mon;
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38 #endif
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39
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40 #if USE_PTHREADS
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41 pthread_mutex_t mon;
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42 #endif
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43 } Monitor;
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44
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45 #define MONPTR(h) (&((Monitor *)(h)->monitor)->mon)
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46
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47 static volatile int inited;
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48
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49 /* =============================== Win32 ============================ */
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50
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51 #if _WIN32
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52
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53 static CRITICAL_SECTION _monitor_critsec;
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54
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55 void _STI_monitor_staticctor()
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56 {
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57 if (!inited)
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58 { InitializeCriticalSection(&_monitor_critsec);
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59 inited = 1;
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60 }
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61 }
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62
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63 void _STD_monitor_staticdtor()
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64 {
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65 if (inited)
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66 { inited = 0;
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67 DeleteCriticalSection(&_monitor_critsec);
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68 }
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69 }
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70
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71 void _d_monitor_create(Object *h)
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72 {
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73 /*
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74 * NOTE: Assume this is only called when h->monitor is null prior to the
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75 * call. However, please note that another thread may call this function
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76 * at the same time, so we can not assert this here. Instead, try and
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77 * create a lock, and if one already exists then forget about it.
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78 */
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79
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80 //printf("+_d_monitor_create(%p)\n", h);
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81 assert(h);
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82 Monitor *cs = NULL;
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83 EnterCriticalSection(&_monitor_critsec);
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84 if (!h->monitor)
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85 {
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86 cs = (Monitor *)calloc(sizeof(Monitor), 1);
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87 assert(cs);
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88 InitializeCriticalSection(&cs->mon);
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89 h->monitor = (void *)cs;
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90 cs = NULL;
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91 }
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92 LeaveCriticalSection(&_monitor_critsec);
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93 if (cs)
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94 free(cs);
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95 //printf("-_d_monitor_create(%p)\n", h);
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96 }
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97
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98 void _d_monitor_destroy(Object *h)
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99 {
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100 //printf("+_d_monitor_destroy(%p)\n", h);
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101 assert(h && h->monitor && !(((Monitor*)h->monitor)->impl));
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102 DeleteCriticalSection(MONPTR(h));
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103 free((void *)h->monitor);
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104 h->monitor = NULL;
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105 //printf("-_d_monitor_destroy(%p)\n", h);
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106 }
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107
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108 int _d_monitor_lock(Object *h)
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109 {
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110 //printf("+_d_monitor_acquire(%p)\n", h);
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111 assert(h && h->monitor && !(((Monitor*)h->monitor)->impl));
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112 EnterCriticalSection(MONPTR(h));
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113 //printf("-_d_monitor_acquire(%p)\n", h);
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114 }
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115
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116 void _d_monitor_unlock(Object *h)
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117 {
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118 //printf("+_d_monitor_release(%p)\n", h);
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119 assert(h && h->monitor && !(((Monitor*)h->monitor)->impl));
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120 LeaveCriticalSection(MONPTR(h));
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121 //printf("-_d_monitor_release(%p)\n", h);
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122 }
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123
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124 #endif
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125
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126 /* =============================== linux ============================ */
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127
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128 #if USE_PTHREADS
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129
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130 // Includes attribute fixes from David Friedman's GDC port
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131
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132 static pthread_mutex_t _monitor_critsec;
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133 static pthread_mutexattr_t _monitors_attr;
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134
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135 void _STI_monitor_staticctor()
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136 {
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137 if (!inited)
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138 {
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139 pthread_mutexattr_init(&_monitors_attr);
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140 pthread_mutexattr_settype(&_monitors_attr, PTHREAD_MUTEX_RECURSIVE_NP);
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141 pthread_mutex_init(&_monitor_critsec, 0);
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142 inited = 1;
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143 }
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144 }
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145
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146 void _STD_monitor_staticdtor()
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147 {
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148 if (inited)
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149 { inited = 0;
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150 pthread_mutex_destroy(&_monitor_critsec);
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151 pthread_mutexattr_destroy(&_monitors_attr);
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152 }
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153 }
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154
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155 void _d_monitor_create(Object *h)
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156 {
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157 /*
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158 * NOTE: Assume this is only called when h->monitor is null prior to the
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159 * call. However, please note that another thread may call this function
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160 * at the same time, so we can not assert this here. Instead, try and
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161 * create a lock, and if one already exists then forget about it.
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162 */
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163
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164 //printf("+_d_monitor_create(%p)\n", h);
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165 assert(h);
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166 Monitor *cs = NULL;
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167 pthread_mutex_lock(&_monitor_critsec);
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168 if (!h->monitor)
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169 {
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170 cs = (Monitor *)calloc(sizeof(Monitor), 1);
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171 assert(cs);
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172 pthread_mutex_init(&cs->mon, & _monitors_attr);
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173 h->monitor = (void *)cs;
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174 cs = NULL;
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175 }
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176 pthread_mutex_unlock(&_monitor_critsec);
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177 if (cs)
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178 free(cs);
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179 //printf("-_d_monitor_create(%p)\n", h);
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180 }
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181
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182 void _d_monitor_destroy(Object *h)
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183 {
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184 //printf("+_d_monitor_destroy(%p)\n", h);
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185 assert(h && h->monitor && !(((Monitor*)h->monitor)->impl));
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186 pthread_mutex_destroy(MONPTR(h));
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187 free((void *)h->monitor);
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188 h->monitor = NULL;
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189 //printf("-_d_monitor_destroy(%p)\n", h);
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190 }
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191
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192 int _d_monitor_lock(Object *h)
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193 {
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194 //printf("+_d_monitor_acquire(%p)\n", h);
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195 assert(h && h->monitor && !(((Monitor*)h->monitor)->impl));
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196 pthread_mutex_lock(MONPTR(h));
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197 //printf("-_d_monitor_acquire(%p)\n", h);
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198 }
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199
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200 void _d_monitor_unlock(Object *h)
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201 {
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202 //printf("+_d_monitor_release(%p)\n", h);
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203 assert(h && h->monitor && !(((Monitor*)h->monitor)->impl));
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204 pthread_mutex_unlock(MONPTR(h));
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205 //printf("-_d_monitor_release(%p)\n", h);
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206 }
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207
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208 #endif