annotate src/thread/linux/SDL_syssem.c @ 769:b8d311d90021

Updated copyright information for 2004 (Happy New Year!)
author Sam Lantinga <slouken@libsdl.org>
date Sun, 04 Jan 2004 16:49:27 +0000
parents f6ffac90895c
children fd068ab116ee
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 #include <stdlib.h>
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29 #include "SDL_error.h"
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30 #include "SDL_thread.h"
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31 #include "SDL_timer.h"
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32
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33 #ifdef linux
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34 /* Look to see if glibc is available, and if so, what version */
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35 #include <features.h>
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36
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37 #if (__GLIBC__ == 2) && (__GLIBC_MINOR__ == 0)
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38 #warning Working around a bug in glibc 2.0 pthreads
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39 #undef SDL_USE_PTHREADS
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40 /* The bug is actually a problem where threads are suspended, but don't
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41 wake up when the thread manager sends them a signal. This is a problem
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42 with thread creation too, but it happens less often. :-/
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43 We avoid this by using System V IPC for semaphores.
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44 */
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45 #endif /* glibc 2.0 */
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46 #endif /* linux */
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47
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48 #ifdef SDL_USE_PTHREADS
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49
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50 #ifdef SDL_NO_PTHREAD_SEMAPHORES
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51 #include "generic/SDL_syssem.c"
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52 #else
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53
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54 #include <stdio.h>
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55 #include <stdlib.h>
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56 #include <unistd.h> /* For getpid() */
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57 #include <pthread.h>
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58 #include <semaphore.h>
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59
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60 /* Wrapper around POSIX 1003.1b semaphores */
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61
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62 #ifdef MACOSX
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63 #define USE_NAMED_SEMAPHORES
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64 /* Broken sem_getvalue() in MacOS X Public Beta */
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65 #define BROKEN_SEMGETVALUE
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66 #endif /* MACOSX */
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67
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68 struct SDL_semaphore {
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69 sem_t *sem;
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70 #ifndef USE_NAMED_SEMAPHORES
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71 sem_t sem_data;
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72 #endif
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73 #ifdef BROKEN_SEMGETVALUE
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74 /* This is a little hack for MacOS X -
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75 It's not thread-safe, but it's better than nothing
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76 */
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77 int sem_value;
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78 #endif
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79 };
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80
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81 /* Create a semaphore, initialized with value */
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82 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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83 {
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84 SDL_sem *sem = (SDL_sem *) malloc(sizeof(SDL_sem));
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85 if ( sem ) {
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86 #ifdef USE_NAMED_SEMAPHORES
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87 static int semnum = 0;
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88 char name[32];
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89
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90 sprintf(name, "/SDL_sem-%d-%4.4d", getpid(), semnum++);
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91 sem->sem = sem_open(name, O_CREAT, 0600, initial_value);
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92 if ( sem->sem == (sem_t *)SEM_FAILED ) {
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93 SDL_SetError("sem_open(%s) failed", name);
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94 free(sem);
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95 sem = NULL;
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96 } else {
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97 sem_unlink(name);
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98 }
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99 #else
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100 if ( sem_init(&sem->sem_data, 0, initial_value) < 0 ) {
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101 SDL_SetError("sem_init() failed");
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102 free(sem);
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103 sem = NULL;
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104 } else {
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105 sem->sem = &sem->sem_data;
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106 }
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107 #endif /* USE_NAMED_SEMAPHORES */
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108
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109 #ifdef BROKEN_SEMGETVALUE
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110 if ( sem ) {
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111 sem->sem_value = initial_value;
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112 }
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113 #endif /* BROKEN_SEMGETVALUE */
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114 } else {
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115 SDL_OutOfMemory();
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116 }
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117 return sem;
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118 }
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119
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120 void SDL_DestroySemaphore(SDL_sem *sem)
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121 {
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122 if ( sem ) {
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123 #ifdef USE_NAMED_SEMAPHORES
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124 sem_close(sem->sem);
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125 #else
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126 sem_destroy(sem->sem);
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127 #endif
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128 free(sem);
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129 }
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130 }
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131
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132 int SDL_SemTryWait(SDL_sem *sem)
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133 {
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134 int retval;
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135
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136 if ( ! sem ) {
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137 SDL_SetError("Passed a NULL semaphore");
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138 return -1;
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139 }
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140 retval = SDL_MUTEX_TIMEDOUT;
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141 if ( sem_trywait(sem->sem) == 0 ) {
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142 #ifdef BROKEN_SEMGETVALUE
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143 --sem->sem_value;
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144 #endif
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145 retval = 0;
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146 }
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147 return retval;
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148 }
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149
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150 int SDL_SemWait(SDL_sem *sem)
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151 {
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152 int retval;
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153
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154 if ( ! sem ) {
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155 SDL_SetError("Passed a NULL semaphore");
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156 return -1;
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157 }
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158
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159 #ifdef BROKEN_SEMGETVALUE
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160 --sem->sem_value;
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161 #endif
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162 retval = sem_wait(sem->sem);
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163 if ( retval < 0 ) {
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164 SDL_SetError("sem_wait() failed");
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165 }
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166 return retval;
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167 }
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168
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169 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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170 {
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171 int retval;
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172
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parents:
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173 if ( ! sem ) {
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174 SDL_SetError("Passed a NULL semaphore");
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175 return -1;
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176 }
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177
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178 /* Try the easy cases first */
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parents:
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179 if ( timeout == 0 ) {
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180 return SDL_SemTryWait(sem);
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181 }
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182 if ( timeout == SDL_MUTEX_MAXWAIT ) {
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183 return SDL_SemWait(sem);
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184 }
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185
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186 /* Ack! We have to busy wait... */
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187 timeout += SDL_GetTicks();
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188 do {
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189 retval = SDL_SemTryWait(sem);
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190 if ( retval == 0 ) {
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191 break;
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192 }
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193 SDL_Delay(1);
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194 } while ( SDL_GetTicks() < timeout );
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195
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196 return retval;
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197 }
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198
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199 Uint32 SDL_SemValue(SDL_sem *sem)
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200 {
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201 int ret = 0;
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202 if ( sem ) {
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203 #ifdef BROKEN_SEMGETVALUE
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204 ret = sem->sem_value;
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205 #else
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206 sem_getvalue(sem->sem, &ret);
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207 #endif
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208 if ( ret < 0 ) {
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209 ret = 0;
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210 }
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211 }
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212 return (Uint32)ret;
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213 }
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214
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215 int SDL_SemPost(SDL_sem *sem)
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216 {
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217 int retval;
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diff changeset
218
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219 if ( ! sem ) {
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220 SDL_SetError("Passed a NULL semaphore");
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221 return -1;
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222 }
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diff changeset
223
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diff changeset
224 #ifdef BROKEN_SEMGETVALUE
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225 ++sem->sem_value;
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diff changeset
226 #endif
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227 retval = sem_post(sem->sem);
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diff changeset
228 if ( retval < 0 ) {
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parents:
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229 SDL_SetError("sem_post() failed");
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parents:
diff changeset
230 }
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diff changeset
231 return retval;
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232 }
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diff changeset
233
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diff changeset
234 #endif /* NO_PTHREAD_SEMAPHORES */
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235
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236 #else /* System V IPC implementation */
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diff changeset
237
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diff changeset
238 #include <stdio.h>
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diff changeset
239 #include <stdlib.h>
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diff changeset
240 #include <sys/types.h>
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
241 #include <sys/ipc.h>
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diff changeset
242 #include <sys/sem.h>
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diff changeset
243 #include <errno.h>
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diff changeset
244
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245 #include "SDL_error.h"
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diff changeset
246 #include "SDL_thread.h"
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247
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248
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249 struct SDL_semaphore {
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250 int id;
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251 };
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diff changeset
252
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parents:
diff changeset
253 /* Not defined by many operating systems, use configure to detect */
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parents:
diff changeset
254 #if !defined(HAVE_SEMUN)
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diff changeset
255 union semun {
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parents:
diff changeset
256 int val;
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parents:
diff changeset
257 struct semid_ds *buf;
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parents:
diff changeset
258 ushort *array;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
259 };
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
260 #endif
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parents:
diff changeset
261
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parents:
diff changeset
262 static struct sembuf op_trywait[2] = {
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parents:
diff changeset
263 { 0, -1, (IPC_NOWAIT|SEM_UNDO) } /* Decrement semaphore, no block */
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parents:
diff changeset
264 };
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
265 static struct sembuf op_wait[2] = {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
266 { 0, -1, SEM_UNDO } /* Decrement semaphore */
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parents:
diff changeset
267 };
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parents:
diff changeset
268 static struct sembuf op_post[1] = {
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parents:
diff changeset
269 { 0, 1, (IPC_NOWAIT|SEM_UNDO) } /* Increment semaphore */
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parents:
diff changeset
270 };
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
271
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
272 /* Create a blockable semaphore */
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parents:
diff changeset
273 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
274 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
275 extern int _creating_thread_lock; /* SDL_threads.c */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
276 SDL_sem *sem;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
277 union semun init;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
278 key_t key;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
279
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
280 sem = (SDL_sem *)malloc(sizeof(*sem));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
281 if ( sem == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
282 SDL_OutOfMemory();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
283 return(NULL);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
284 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
285 /* This flag is true if we are creating the thread manager sem,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
286 which is never freed. This allows us to reuse the same sem.
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
287 */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
288 if ( _creating_thread_lock ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
289 key = 'S'+'D'+'L';
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
290 } else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
291 key = IPC_PRIVATE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
292 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
293 /* Keep trying to create sem while we don't own the requested key */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
294 do {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
295 if ( key != IPC_PRIVATE ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
296 ++key;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
297 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
298 sem->id = semget(key, 1, (0600|IPC_CREAT));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
299 } while ((sem->id < 0) && (key != IPC_PRIVATE) && (errno == EACCES));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
300
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
301 /* Report the error if we eventually failed */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
302 if ( sem->id < 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
303 SDL_SetError("Couldn't create semaphore");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
304 free(sem);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
305 return(NULL);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
306 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
307 init.val = initial_value; /* Initialize semaphore */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
308 semctl(sem->id, 0, SETVAL, init);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
309 return(sem);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
310 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
311
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
312 void SDL_DestroySemaphore(SDL_sem *sem)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
313 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
314 if ( sem ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
315 #ifdef _SGI_SOURCE
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
316 semctl(sem->id, 0, IPC_RMID);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
317 #else
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
318 union semun dummy;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
319 dummy.val = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
320 semctl(sem->id, 0, IPC_RMID, dummy);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
321 #endif
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
322 free(sem);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
323 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
324 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
325
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
326 int SDL_SemTryWait(SDL_sem *sem)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
327 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
328 int retval;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
329
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
330 if ( ! sem ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
331 SDL_SetError("Passed a NULL semaphore");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
332 return -1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
333 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
334
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
335 retval = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
336 tryagain:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
337 if ( semop(sem->id, op_trywait, 1) < 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
338 if ( errno == EINTR ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
339 goto tryagain;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
340 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
341 retval = SDL_MUTEX_TIMEDOUT;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
342 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
343 return retval;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
344 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
345
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
346 int SDL_SemWait(SDL_sem *sem)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
347 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
348 int retval;
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349
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350 if ( ! sem ) {
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351 SDL_SetError("Passed a NULL semaphore");
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352 return -1;
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353 }
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354
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355 retval = 0;
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356 tryagain:
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357 if ( semop(sem->id, op_wait, 1) < 0 ) {
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358 if ( errno == EINTR ) {
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359 goto tryagain;
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360 }
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361 SDL_SetError("Semaphore operation error");
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362 retval = -1;
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363 }
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364 return retval;
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365 }
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366
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367 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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368 {
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369 int retval;
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370
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371 if ( ! sem ) {
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372 SDL_SetError("Passed a NULL semaphore");
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373 return -1;
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374 }
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375
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376 /* Try the easy cases first */
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377 if ( timeout == 0 ) {
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378 return SDL_SemTryWait(sem);
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379 }
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380 if ( timeout == SDL_MUTEX_MAXWAIT ) {
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381 return SDL_SemWait(sem);
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382 }
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383
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384 /* Ack! We have to busy wait... */
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385 timeout += SDL_GetTicks();
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386 do {
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387 retval = SDL_SemTryWait(sem);
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388 if ( retval == 0 ) {
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389 break;
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Sam Lantinga <slouken@lokigames.com>
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390 }
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391 SDL_Delay(1);
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392 } while ( SDL_GetTicks() < timeout );
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393
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394 return retval;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
395 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
396
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Sam Lantinga <slouken@lokigames.com>
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diff changeset
397 Uint32 SDL_SemValue(SDL_sem *sem)
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Sam Lantinga <slouken@lokigames.com>
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diff changeset
398 {
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Sam Lantinga <slouken@lokigames.com>
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399 int semval;
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400 Uint32 value;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
401
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diff changeset
402 value = 0;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
403 if ( sem ) {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
404 tryagain:
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
405 #ifdef _SGI_SOURCE
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
406 semval = semctl(sem->id, 0, GETVAL);
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
407 #else
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
408 {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
409 union semun arg;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
410 arg.val = 0;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
411 semval = semctl(sem->id, 0, GETVAL, arg);
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
412 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
413 #endif
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
414 if ( semval < 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
415 if ( errno == EINTR ) {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
416 goto tryagain;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
417 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
418 } else {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
419 value = (Uint32)semval;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
420 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
421 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
422 return value;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
423 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
424
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
425 int SDL_SemPost(SDL_sem *sem)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
426 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
427 int retval;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
428
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
429 if ( ! sem ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
430 SDL_SetError("Passed a NULL semaphore");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
431 return -1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
432 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
433
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
434 retval = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
435 tryagain:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
436 if ( semop(sem->id, op_post, 1) < 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
437 if ( errno == EINTR ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
438 goto tryagain;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
439 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
440 SDL_SetError("Semaphore operation error");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
441 retval = -1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
442 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
443 return retval;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
444 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
445
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
446 #endif /* SDL_USE_PTHREADS */