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annotate src/thread/dc/SDL_syssem.c @ 1851:536b0704b7d8

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Make sure sem_wait didn't return early with EINTR. Fixes Bugzilla #231.
author Ryan C. Gordon <icculus@icculus.org>
date Wed, 17 May 2006 23:42:48 +0000
parents d910939febfa
children c121d94672cb a1b03ba2fcd0
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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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536b0704b7d8 Make sure sem_wait didn't return early with EINTR. Fixes Bugzilla #231.
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22
536b0704b7d8 Make sure sem_wait didn't return early with EINTR. Fixes Bugzilla #231.
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23 #include <errno.h>
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24
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25 #include "SDL_config.h"
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26
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27 /* An implementation of semaphores using mutexes and condition variables */
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28
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29 #include "SDL_timer.h"
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30 #include "SDL_thread.h"
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31 #include "SDL_systhread_c.h"
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32
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33
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34 #if SDL_THREADS_DISABLED
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35
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36 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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37 {
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38 SDL_SetError("SDL not configured with thread support");
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39 return (SDL_sem *)0;
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40 }
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41
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42 void SDL_DestroySemaphore(SDL_sem *sem)
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43 {
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44 return;
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45 }
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46
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47 int SDL_SemTryWait(SDL_sem *sem)
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48 {
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49 SDL_SetError("SDL not configured with thread support");
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50 return -1;
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51 }
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52
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53 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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54 {
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55 SDL_SetError("SDL not configured with thread support");
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56 return -1;
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57 }
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58
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59 int SDL_SemWait(SDL_sem *sem)
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60 {
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61 SDL_SetError("SDL not configured with thread support");
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62 return -1;
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63 }
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64
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65 Uint32 SDL_SemValue(SDL_sem *sem)
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66 {
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67 return 0;
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68 }
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69
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70 int SDL_SemPost(SDL_sem *sem)
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71 {
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72 SDL_SetError("SDL not configured with thread support");
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73 return -1;
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74 }
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75
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76 #else
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77
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78 #include <kos/sem.h>
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79
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80 struct SDL_semaphore
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81 {
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82 semaphore_t sem;
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83 };
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84
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85 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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86 {
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87 return (SDL_sem *)sem_create(initial_value);
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88 }
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89
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90 /* WARNING:
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91 You cannot call this function when another thread is using the semaphore.
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92 */
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93 void SDL_DestroySemaphore(SDL_sem *sem)
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94 {
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95 if ( ! sem ) {
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96 SDL_SetError("Passed a NULL semaphore");
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97 return;
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98 }
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99
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100 sem_destroy(&sem->sem);
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101 }
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102
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103 int SDL_SemTryWait(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_trywait(&sem->sem);
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113 if (retval==0) return 0;
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114 else return SDL_MUTEX_TIMEDOUT;
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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 /* A timeout of 0 is an easy case */
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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
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133 retval = sem_wait_timed(&sem->sem,timeout);
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134 if (retval==-1) retval= SDL_MUTEX_TIMEDOUT;
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135
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136 return retval;
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137 }
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138
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139 int SDL_SemWait(SDL_sem *sem)
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140 {
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141 int retval;
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142
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143 if ( ! sem ) {
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144 SDL_SetError("Passed a NULL semaphore");
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145 return -1;
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146 }
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147
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536b0704b7d8 Make sure sem_wait didn't return early with EINTR. Fixes Bugzilla #231.
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148 while ( ((retval = sem_wait(&sem->sem)) == -1) && (errno == EINTR) ) {}
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149 return retval;
509
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150 }
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151
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152 Uint32 SDL_SemValue(SDL_sem *sem)
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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 return sem_count(&sem->sem);
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160 }
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161
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162 int SDL_SemPost(SDL_sem *sem)
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163 {
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164 if ( ! sem ) {
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165 SDL_SetError("Passed a NULL semaphore");
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166 return -1;
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167 }
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168
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169 sem_signal(&sem->sem);
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170 return 0;
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171 }
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172
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents: 1358
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173 #endif /* SDL_THREADS_DISABLED */