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annotate druntime/src/compiler/ldc/critical.c @ 759:d3eb054172f9

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Added copy of druntime from DMD 2.020 modified for LDC.
author Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
date Tue, 11 Nov 2008 01:52:37 +0100
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759
d3eb054172f9 Added copy of druntime from DMD 2.020 modified for LDC.
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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 || __APPLE__ || __FreeBSD__
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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 #if !linux
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85 #define PTHREAD_MUTEX_RECURSIVE_NP PTHREAD_MUTEX_RECURSIVE
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86 #endif
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87
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88 /******************************************
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89 * Enter/exit critical section.
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90 */
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91
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92 /* We don't initialize critical sections unless we actually need them.
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93 * So keep a linked list of the ones we do use, and in the static destructor
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94 * code, walk the list and release them.
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95 */
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96
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97 typedef struct D_CRITICAL_SECTION
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98 {
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99 struct D_CRITICAL_SECTION *next;
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100 pthread_mutex_t cs;
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101 } D_CRITICAL_SECTION;
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102
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103 static D_CRITICAL_SECTION *dcs_list;
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104 static D_CRITICAL_SECTION critical_section;
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105 static pthread_mutexattr_t _criticals_attr;
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106
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107 void _STI_critical_init(void);
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108 void _STD_critical_term(void);
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109
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110 void _d_criticalenter(D_CRITICAL_SECTION *dcs)
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111 {
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112 if (!dcs_list)
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113 { _STI_critical_init();
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114 atexit(_STD_critical_term);
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115 }
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116 //printf("_d_criticalenter(dcs = x%x)\n", dcs);
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117 if (!dcs->next)
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118 {
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119 pthread_mutex_lock(&critical_section.cs);
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120 if (!dcs->next) // if, in the meantime, another thread didn't set it
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121 {
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122 dcs->next = dcs_list;
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123 dcs_list = dcs;
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124 pthread_mutex_init(&dcs->cs, &_criticals_attr);
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125 }
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126 pthread_mutex_unlock(&critical_section.cs);
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127 }
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128 pthread_mutex_lock(&dcs->cs);
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129 }
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130
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131 void _d_criticalexit(D_CRITICAL_SECTION *dcs)
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132 {
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133 //printf("_d_criticalexit(dcs = x%x)\n", dcs);
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134 pthread_mutex_unlock(&dcs->cs);
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135 }
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136
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137 void _STI_critical_init()
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138 {
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139 if (!dcs_list)
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140 { //printf("_STI_critical_init()\n");
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141 pthread_mutexattr_init(&_criticals_attr);
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142 pthread_mutexattr_settype(&_criticals_attr, PTHREAD_MUTEX_RECURSIVE_NP);
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143
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144 // The global critical section doesn't need to be recursive
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145 pthread_mutex_init(&critical_section.cs, 0);
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146 dcs_list = &critical_section;
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147 }
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148 }
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149
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150 void _STD_critical_term()
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151 {
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152 if (dcs_list)
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153 { //printf("_STI_critical_term()\n");
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154 while (dcs_list)
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155 {
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156 //printf("\tlooping... %x\n", dcs_list);
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157 pthread_mutex_destroy(&dcs_list->cs);
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158 dcs_list = dcs_list->next;
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159 }
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160 }
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161 }
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162
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163 #endif
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164