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annotate druntime/src/compiler/ldc/critical.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 * Implementation of support routines for synchronized blocks.
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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
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14 /* ================================= Win32 ============================ */
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15
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16 #if _WIN32
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17
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18 #include <windows.h>
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19
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20 /******************************************
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21 * Enter/exit critical section.
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22 */
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23
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24 /* We don't initialize critical sections unless we actually need them.
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25 * So keep a linked list of the ones we do use, and in the static destructor
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26 * code, walk the list and release them.
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27 */
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28
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29 typedef struct D_CRITICAL_SECTION
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30 {
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31 struct D_CRITICAL_SECTION *next;
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32 CRITICAL_SECTION cs;
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33 } D_CRITICAL_SECTION;
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34
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35 static D_CRITICAL_SECTION *dcs_list;
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36 static D_CRITICAL_SECTION critical_section;
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37 static volatile int inited;
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38
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39 void _d_criticalenter(D_CRITICAL_SECTION *dcs)
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40 {
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41 if (!dcs->next)
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42 {
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43 EnterCriticalSection(&critical_section.cs);
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44 if (!dcs->next) // if, in the meantime, another thread didn't set it
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45 {
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46 dcs->next = dcs_list;
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47 dcs_list = dcs;
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48 InitializeCriticalSection(&dcs->cs);
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49 }
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50 LeaveCriticalSection(&critical_section.cs);
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51 }
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52 EnterCriticalSection(&dcs->cs);
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53 }
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54
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55 void _d_criticalexit(D_CRITICAL_SECTION *dcs)
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56 {
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57 LeaveCriticalSection(&dcs->cs);
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58 }
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59
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60 void _STI_critical_init()
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61 {
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62 if (!inited)
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63 { InitializeCriticalSection(&critical_section.cs);
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64 dcs_list = &critical_section;
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65 inited = 1;
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66 }
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67 }
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68
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69 void _STD_critical_term()
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70 {
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71 if (inited)
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72 { inited = 0;
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73 while (dcs_list)
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74 {
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75 DeleteCriticalSection(&dcs_list->cs);
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76 dcs_list = dcs_list->next;
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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 #endif
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82
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83 /* ================================= linux ============================ */
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84
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85 #if linux || __APPLE__
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86
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87 #include <stdio.h>
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88 #include <stdlib.h>
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89 #include <pthread.h>
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90
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91 // PTHREAD_MUTEX_RECURSIVE is the "standard" symbol,
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92 // while the _NP version is specific to Linux
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93 #ifndef PTHREAD_MUTEX_RECURSIVE
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94 # define PTHREAD_MUTEX_RECURSIVE PTHREAD_MUTEX_RECURSIVE_NP
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95 #endif
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96
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97 /******************************************
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98 * Enter/exit critical section.
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99 */
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100
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101 /* We don't initialize critical sections unless we actually need them.
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102 * So keep a linked list of the ones we do use, and in the static destructor
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103 * code, walk the list and release them.
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104 */
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105
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106 typedef struct D_CRITICAL_SECTION
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107 {
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108 struct D_CRITICAL_SECTION *next;
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109 pthread_mutex_t cs;
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110 } D_CRITICAL_SECTION;
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111
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112 static D_CRITICAL_SECTION *dcs_list;
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113 static D_CRITICAL_SECTION critical_section;
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114 static pthread_mutexattr_t _criticals_attr;
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115
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116 void _STI_critical_init(void);
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117 void _STD_critical_term(void);
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118
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119 void _d_criticalenter(D_CRITICAL_SECTION *dcs)
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120 {
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121 if (!dcs_list)
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122 { _STI_critical_init();
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123 atexit(_STD_critical_term);
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124 }
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125 //printf("_d_criticalenter(dcs = x%x)\n", dcs);
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126 if (!dcs->next)
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127 {
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128 pthread_mutex_lock(&critical_section.cs);
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129 if (!dcs->next) // if, in the meantime, another thread didn't set it
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130 {
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131 dcs->next = dcs_list;
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132 dcs_list = dcs;
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133 pthread_mutex_init(&dcs->cs, &_criticals_attr);
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134 }
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135 pthread_mutex_unlock(&critical_section.cs);
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136 }
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137 pthread_mutex_lock(&dcs->cs);
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138 }
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139
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140 void _d_criticalexit(D_CRITICAL_SECTION *dcs)
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141 {
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142 //printf("_d_criticalexit(dcs = x%x)\n", dcs);
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143 pthread_mutex_unlock(&dcs->cs);
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144 }
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145
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146 void _STI_critical_init()
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147 {
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148 if (!dcs_list)
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149 { //printf("_STI_critical_init()\n");
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150 pthread_mutexattr_init(&_criticals_attr);
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151 pthread_mutexattr_settype(&_criticals_attr, PTHREAD_MUTEX_RECURSIVE);
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152
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153 // The global critical section doesn't need to be recursive
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154 pthread_mutex_init(&critical_section.cs, 0);
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155 dcs_list = &critical_section;
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156 }
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157 }
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158
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159 void _STD_critical_term()
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160 {
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161 if (dcs_list)
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162 { //printf("_STI_critical_term()\n");
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163 while (dcs_list)
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164 {
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165 //printf("\tlooping... %x\n", dcs_list);
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166 pthread_mutex_destroy(&dcs_list->cs);
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167 dcs_list = dcs_list->next;
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168 }
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169 }
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170 }
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171
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172 #endif
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173