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annotate src/thread/pthread/SDL_syssem.c @ 1455:f487bb150acc

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Hah, standard stdio code crashed on the test case.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 27 Feb 2006 22:14:40 +0000
parents d910939febfa
children dc6b59e925a2
rev   line source
1361
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 #include <pthread.h>
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25 #include <semaphore.h>
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26
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27 #include "SDL_thread.h"
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28 #include "SDL_timer.h"
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29
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30 /* Wrapper around POSIX 1003.1b semaphores */
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31
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32 #ifdef __MACOSX__
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33 #define USE_NAMED_SEMAPHORES 1
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34 #endif
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35
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36 struct SDL_semaphore {
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37 sem_t *sem;
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38 #if !USE_NAMED_SEMAPHORES
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39 sem_t sem_data;
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40 #endif
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41 };
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42
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43 /* Create a semaphore, initialized with value */
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44 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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45 {
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46 SDL_sem *sem = (SDL_sem *) SDL_malloc(sizeof(SDL_sem));
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47 if ( sem ) {
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48 #if USE_NAMED_SEMAPHORES
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49 static int semnum = 0;
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50 char name[32];
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51
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52 SDL_snprintf(name, SDL_arraysize(name), "/SDL_sem-%d-%4.4d", getpid(), semnum++);
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53 sem->sem = sem_open(name, O_CREAT, 0600, initial_value);
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54 if ( sem->sem == (sem_t *)SEM_FAILED ) {
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55 SDL_SetError("sem_open(%s) failed", name);
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56 SDL_free(sem);
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57 sem = NULL;
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58 } else {
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59 sem_unlink(name);
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60 }
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61 #else
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62 if ( sem_init(&sem->sem_data, 0, initial_value) < 0 ) {
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63 SDL_SetError("sem_init() failed");
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64 SDL_free(sem);
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65 sem = NULL;
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66 } else {
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67 sem->sem = &sem->sem_data;
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68 }
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69 #endif /* USE_NAMED_SEMAPHORES */
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70 } else {
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71 SDL_OutOfMemory();
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72 }
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73 return sem;
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74 }
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75
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76 void SDL_DestroySemaphore(SDL_sem *sem)
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77 {
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78 if ( sem ) {
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79 #if USE_NAMED_SEMAPHORES
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80 sem_close(sem->sem);
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81 #else
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82 sem_destroy(sem->sem);
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83 #endif
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84 SDL_free(sem);
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85 }
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86 }
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87
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88 int SDL_SemTryWait(SDL_sem *sem)
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89 {
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90 int retval;
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91
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92 if ( ! sem ) {
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93 SDL_SetError("Passed a NULL semaphore");
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94 return -1;
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95 }
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96 retval = SDL_MUTEX_TIMEDOUT;
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97 if ( sem_trywait(sem->sem) == 0 ) {
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98 retval = 0;
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99 }
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100 return retval;
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101 }
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102
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103 int SDL_SemWait(SDL_sem *sem)
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104 {
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105 int retval;
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106
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107 if ( ! sem ) {
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108 SDL_SetError("Passed a NULL semaphore");
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109 return -1;
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110 }
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111
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112 retval = sem_wait(sem->sem);
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113 if ( retval < 0 ) {
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114 SDL_SetError("sem_wait() failed");
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115 }
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116 return retval;
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117 }
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118
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119 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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120 {
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121 int retval;
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122
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123 if ( ! sem ) {
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124 SDL_SetError("Passed a NULL semaphore");
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125 return -1;
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126 }
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127
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128 /* Try the easy cases first */
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129 if ( timeout == 0 ) {
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130 return SDL_SemTryWait(sem);
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131 }
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132 if ( timeout == SDL_MUTEX_MAXWAIT ) {
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133 return SDL_SemWait(sem);
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134 }
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135
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136 /* Ack! We have to busy wait... */
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137 timeout += SDL_GetTicks();
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138 do {
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139 retval = SDL_SemTryWait(sem);
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140 if ( retval == 0 ) {
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141 break;
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142 }
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143 SDL_Delay(1);
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144 } while ( SDL_GetTicks() < timeout );
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145
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146 return retval;
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147 }
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148
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149 Uint32 SDL_SemValue(SDL_sem *sem)
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150 {
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151 int ret = 0;
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152 if ( sem ) {
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153 sem_getvalue(sem->sem, &ret);
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154 if ( ret < 0 ) {
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155 ret = 0;
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156 }
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157 }
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158 return (Uint32)ret;
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159 }
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160
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161 int SDL_SemPost(SDL_sem *sem)
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162 {
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163 int retval;
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164
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165 if ( ! sem ) {
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166 SDL_SetError("Passed a NULL semaphore");
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167 return -1;
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168 }
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169
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170 retval = sem_post(sem->sem);
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171 if ( retval < 0 ) {
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172 SDL_SetError("sem_post() failed");
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173 }
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174 return retval;
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175 }