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annotate runtime/internal/critical.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 02fb65cddc3e
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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.
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1 /*
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2 * Placed into the 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
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7 /* ================================= Win32 ============================ */
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8
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9 #if _WIN32
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10
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11 #include <windows.h>
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12
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13 /******************************************
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14 * Enter/exit critical section.
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15 */
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16
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17 /* We don't initialize critical sections unless we actually need them.
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18 * So keep a linked list of the ones we do use, and in the static destructor
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19 * code, walk the list and release them.
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20 */
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21
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22 typedef struct D_CRITICAL_SECTION
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23 {
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24 struct D_CRITICAL_SECTION *next;
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25 CRITICAL_SECTION cs;
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26 } D_CRITICAL_SECTION;
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27
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28 static D_CRITICAL_SECTION *dcs_list;
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29 static D_CRITICAL_SECTION critical_section;
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30 static volatile int inited;
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31
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32 void _d_criticalenter(D_CRITICAL_SECTION *dcs)
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33 {
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34 if (!dcs->next)
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35 {
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36 EnterCriticalSection(&critical_section.cs);
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37 if (!dcs->next) // if, in the meantime, another thread didn't set it
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38 {
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39 dcs->next = dcs_list;
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40 dcs_list = dcs;
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41 InitializeCriticalSection(&dcs->cs);
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42 }
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43 LeaveCriticalSection(&critical_section.cs);
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44 }
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45 EnterCriticalSection(&dcs->cs);
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46 }
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47
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48 void _d_criticalexit(D_CRITICAL_SECTION *dcs)
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49 {
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50 LeaveCriticalSection(&dcs->cs);
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51 }
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52
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53 void _STI_critical_init()
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54 {
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55 if (!inited)
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56 { InitializeCriticalSection(&critical_section.cs);
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57 dcs_list = &critical_section;
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58 inited = 1;
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59 }
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60 }
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61
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62 void _STD_critical_term()
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63 {
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64 if (inited)
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65 { inited = 0;
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66 while (dcs_list)
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67 {
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68 DeleteCriticalSection(&dcs_list->cs);
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69 dcs_list = dcs_list->next;
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70 }
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71 }
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72 }
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73
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74 #endif
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75
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76 /* ================================= linux ============================ */
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77
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78 #if linux
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79
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80 #include <stdio.h>
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81 #include <stdlib.h>
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82 #include <pthread.h>
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83
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84 /******************************************
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85 * Enter/exit critical section.
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86 */
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87
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88 /* We don't initialize critical sections unless we actually need them.
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89 * So keep a linked list of the ones we do use, and in the static destructor
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90 * code, walk the list and release them.
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91 */
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92
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93 typedef struct D_CRITICAL_SECTION
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94 {
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95 struct D_CRITICAL_SECTION *next;
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96 pthread_mutex_t cs;
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97 } D_CRITICAL_SECTION;
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98
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99 static D_CRITICAL_SECTION *dcs_list;
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100 static D_CRITICAL_SECTION critical_section;
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101 static pthread_mutexattr_t _criticals_attr;
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102
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103 void _STI_critical_init(void);
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104 void _STD_critical_term(void);
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105
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106 void _d_criticalenter(D_CRITICAL_SECTION *dcs)
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107 {
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108 if (!dcs_list)
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109 { _STI_critical_init();
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110 atexit(_STD_critical_term);
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111 }
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112 //printf("_d_criticalenter(dcs = x%x)\n", dcs);
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113 if (!dcs->next)
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114 {
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115 pthread_mutex_lock(&critical_section.cs);
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116 if (!dcs->next) // if, in the meantime, another thread didn't set it
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117 {
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118 dcs->next = dcs_list;
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119 dcs_list = dcs;
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120 pthread_mutex_init(&dcs->cs, &_criticals_attr);
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121 }
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122 pthread_mutex_unlock(&critical_section.cs);
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123 }
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124 pthread_mutex_lock(&dcs->cs);
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125 }
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126
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127 void _d_criticalexit(D_CRITICAL_SECTION *dcs)
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128 {
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129 //printf("_d_criticalexit(dcs = x%x)\n", dcs);
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130 pthread_mutex_unlock(&dcs->cs);
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131 }
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132
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133 void _STI_critical_init()
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134 {
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135 if (!dcs_list)
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136 { //printf("_STI_critical_init()\n");
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137 pthread_mutexattr_init(&_criticals_attr);
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138 pthread_mutexattr_settype(&_criticals_attr, PTHREAD_MUTEX_RECURSIVE_NP);
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139
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140 // The global critical section doesn't need to be recursive
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141 pthread_mutex_init(&critical_section.cs, 0);
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142 dcs_list = &critical_section;
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143 }
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144 }
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145
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146 void _STD_critical_term()
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147 {
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148 if (dcs_list)
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149 { //printf("_STI_critical_term()\n");
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150 while (dcs_list)
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151 {
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152 //printf("\tlooping... %x\n", dcs_list);
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153 pthread_mutex_destroy(&dcs_list->cs);
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154 dcs_list = dcs_list->next;
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155 }
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156 }
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157 }
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158
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159 #endif
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160