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annotate druntime/src/compiler/ldc/monitor.c @ 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 * Contains the implementation for object monitors.
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3 *
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4 * Copyright: Copyright Digital Mars 2000 - 2009.
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5 * License: <a href="http://www.boost.org/LICENSE_1_0.txt>Boost License 1.0</a>.
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6 * Authors: Walter Bright, Sean Kelly
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7 *
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8 * Copyright Digital Mars 2000 - 2009.
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9 * Distributed under the Boost Software License, Version 1.0.
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10 * (See accompanying file LICENSE_1_0.txt or copy at
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11 * http://www.boost.org/LICENSE_1_0.txt)
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12 */
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13 #include <stdio.h>
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14 #include <stdlib.h>
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15 #include <assert.h>
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16
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17 #if _WIN32
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18 #elif linux || __APPLE__
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19 #define USE_PTHREADS 1
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20 #else
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21 #endif
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22
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23 #if _WIN32
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24 #include <windows.h>
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25 #endif
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26
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27 #if USE_PTHREADS
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28 #include <pthread.h>
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29 #endif
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30
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31 #include "mars.h"
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32
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33 // This is what the monitor reference in Object points to
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34 typedef struct Monitor
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35 {
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36 void* impl; // for user-level monitors
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37 Array devt; // for internal monitors
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38
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39 #if _WIN32
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40 CRITICAL_SECTION mon;
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41 #endif
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42
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43 #if USE_PTHREADS
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44 pthread_mutex_t mon;
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45 #endif
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46 } Monitor;
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47
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48 #define MONPTR(h) (&((Monitor *)(h)->monitor)->mon)
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49
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50 static volatile int inited;
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51
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52 /* =============================== Win32 ============================ */
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53
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54 #if _WIN32
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55
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56 static CRITICAL_SECTION _monitor_critsec;
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57
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58 void _STI_monitor_staticctor()
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59 {
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60 if (!inited)
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61 { InitializeCriticalSection(&_monitor_critsec);
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62 inited = 1;
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63 }
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64 }
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65
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66 void _STD_monitor_staticdtor()
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67 {
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68 if (inited)
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69 { inited = 0;
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70 DeleteCriticalSection(&_monitor_critsec);
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71 }
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72 }
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73
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74 void _d_monitor_create(Object *h)
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75 {
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76 /*
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77 * NOTE: Assume this is only called when h->monitor is null prior to the
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78 * call. However, please note that another thread may call this function
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79 * at the same time, so we can not assert this here. Instead, try and
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80 * create a lock, and if one already exists then forget about it.
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81 */
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82
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83 //printf("+_d_monitor_create(%p)\n", h);
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84 assert(h);
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85 Monitor *cs = NULL;
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86 EnterCriticalSection(&_monitor_critsec);
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87 if (!h->monitor)
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88 {
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89 cs = (Monitor *)calloc(sizeof(Monitor), 1);
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90 assert(cs);
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91 InitializeCriticalSection(&cs->mon);
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92 h->monitor = (void *)cs;
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93 cs = NULL;
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94 }
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95 LeaveCriticalSection(&_monitor_critsec);
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96 if (cs)
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97 free(cs);
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98 //printf("-_d_monitor_create(%p)\n", h);
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99 }
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100
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101 void _d_monitor_destroy(Object *h)
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102 {
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103 //printf("+_d_monitor_destroy(%p)\n", h);
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104 assert(h && h->monitor && !(((Monitor*)h->monitor)->impl));
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105 DeleteCriticalSection(MONPTR(h));
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106 free((void *)h->monitor);
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107 h->monitor = NULL;
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108 //printf("-_d_monitor_destroy(%p)\n", h);
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109 }
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110
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111 int _d_monitor_lock(Object *h)
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112 {
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113 //printf("+_d_monitor_acquire(%p)\n", h);
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114 assert(h && h->monitor && !(((Monitor*)h->monitor)->impl));
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115 EnterCriticalSection(MONPTR(h));
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116 //printf("-_d_monitor_acquire(%p)\n", h);
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117 }
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118
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119 void _d_monitor_unlock(Object *h)
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120 {
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121 //printf("+_d_monitor_release(%p)\n", h);
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122 assert(h && h->monitor && !(((Monitor*)h->monitor)->impl));
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123 LeaveCriticalSection(MONPTR(h));
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124 //printf("-_d_monitor_release(%p)\n", h);
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125 }
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126
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127 #endif
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128
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129 /* =============================== linux ============================ */
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130
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131 #if USE_PTHREADS
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132
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133 #ifndef PTHREAD_MUTEX_RECURSIVE
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134 # define PTHREAD_MUTEX_RECURSIVE PTHREAD_MUTEX_RECURSIVE_NP
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135 #endif
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136
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137 // Includes attribute fixes from David Friedman's GDC port
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138
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139 static pthread_mutex_t _monitor_critsec;
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140 static pthread_mutexattr_t _monitors_attr;
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141
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142 void _STI_monitor_staticctor()
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143 {
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144 if (!inited)
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145 {
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146 pthread_mutexattr_init(&_monitors_attr);
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147 pthread_mutexattr_settype(&_monitors_attr, PTHREAD_MUTEX_RECURSIVE);
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148 pthread_mutex_init(&_monitor_critsec, 0);
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149 inited = 1;
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150 }
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151 }
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152
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153 void _STD_monitor_staticdtor()
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154 {
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155 if (inited)
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156 { inited = 0;
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157 pthread_mutex_destroy(&_monitor_critsec);
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158 pthread_mutexattr_destroy(&_monitors_attr);
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159 }
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160 }
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161
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162 void _d_monitor_create(Object *h)
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163 {
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164 /*
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165 * NOTE: Assume this is only called when h->monitor is null prior to the
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166 * call. However, please note that another thread may call this function
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167 * at the same time, so we can not assert this here. Instead, try and
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168 * create a lock, and if one already exists then forget about it.
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169 */
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170
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171 //printf("+_d_monitor_create(%p)\n", h);
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172 assert(h);
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173 Monitor *cs = NULL;
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174 pthread_mutex_lock(&_monitor_critsec);
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175 if (!h->monitor)
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176 {
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177 cs = (Monitor *)calloc(sizeof(Monitor), 1);
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178 assert(cs);
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179 pthread_mutex_init(&cs->mon, & _monitors_attr);
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180 h->monitor = (void *)cs;
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181 cs = NULL;
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182 }
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183 pthread_mutex_unlock(&_monitor_critsec);
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184 if (cs)
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185 free(cs);
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186 //printf("-_d_monitor_create(%p)\n", h);
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187 }
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188
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189 void _d_monitor_destroy(Object *h)
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190 {
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191 //printf("+_d_monitor_destroy(%p)\n", h);
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192 assert(h && h->monitor && !(((Monitor*)h->monitor)->impl));
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193 pthread_mutex_destroy(MONPTR(h));
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194 free((void *)h->monitor);
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195 h->monitor = NULL;
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196 //printf("-_d_monitor_destroy(%p)\n", h);
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197 }
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198
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199 int _d_monitor_lock(Object *h)
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200 {
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201 //printf("+_d_monitor_acquire(%p)\n", h);
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202 assert(h && h->monitor && !(((Monitor*)h->monitor)->impl));
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203 pthread_mutex_lock(MONPTR(h));
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204 //printf("-_d_monitor_acquire(%p)\n", h);
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205 }
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206
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207 void _d_monitor_unlock(Object *h)
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208 {
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209 //printf("+_d_monitor_release(%p)\n", h);
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210 assert(h && h->monitor && !(((Monitor*)h->monitor)->impl));
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211 pthread_mutex_unlock(MONPTR(h));
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212 //printf("-_d_monitor_release(%p)\n", h);
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213 }
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214
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215 #endif