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annotate src/thread/pthread/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 eba962f9d603
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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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 #include <errno.h>
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27
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28 #include "SDL_thread.h"
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29 #include "SDL_timer.h"
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30
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31 /* Wrapper around POSIX 1003.1b semaphores */
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32
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33 #ifdef __MACOSX__
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34 /* Mac OS X doesn't support sem_getvalue() as of version 10.4 */
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35 #include "../generic/SDL_syssem.c"
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36 #else
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37
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38 struct SDL_semaphore {
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39 sem_t sem;
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40 };
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41
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42 /* Create a semaphore, initialized with value */
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43 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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44 {
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45 SDL_sem *sem = (SDL_sem *) SDL_malloc(sizeof(SDL_sem));
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46 if ( sem ) {
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47 if ( sem_init(&sem->sem, 0, initial_value) < 0 ) {
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48 SDL_SetError("sem_init() failed");
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49 SDL_free(sem);
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50 sem = NULL;
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51 }
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52 } else {
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53 SDL_OutOfMemory();
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54 }
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55 return sem;
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56 }
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57
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58 void SDL_DestroySemaphore(SDL_sem *sem)
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59 {
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60 if ( sem ) {
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61 sem_destroy(&sem->sem);
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62 SDL_free(sem);
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63 }
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64 }
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65
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66 int SDL_SemTryWait(SDL_sem *sem)
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67 {
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68 int retval;
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69
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70 if ( ! sem ) {
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71 SDL_SetError("Passed a NULL semaphore");
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72 return -1;
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73 }
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74 retval = SDL_MUTEX_TIMEDOUT;
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75 if ( sem_trywait(&sem->sem) == 0 ) {
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76 retval = 0;
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77 }
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78 return retval;
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79 }
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80
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81 int SDL_SemWait(SDL_sem *sem)
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82 {
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83 int retval;
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84
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85 if ( ! sem ) {
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86 SDL_SetError("Passed a NULL semaphore");
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87 return -1;
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88 }
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89
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90 while ( ((retval = sem_wait(&sem->sem)) == -1) && (errno == EINTR) ) {}
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91 if ( retval < 0 ) {
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92 SDL_SetError("sem_wait() failed");
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93 }
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94 return retval;
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95 }
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96
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97 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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98 {
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99 int retval;
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100
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101 if ( ! sem ) {
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102 SDL_SetError("Passed a NULL semaphore");
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103 return -1;
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104 }
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105
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106 /* Try the easy cases first */
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107 if ( timeout == 0 ) {
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108 return SDL_SemTryWait(sem);
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109 }
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110 if ( timeout == SDL_MUTEX_MAXWAIT ) {
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111 return SDL_SemWait(sem);
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112 }
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113
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114 /* Ack! We have to busy wait... */
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115 /* FIXME: Use sem_timedwait()? */
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116 timeout += SDL_GetTicks();
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117 do {
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118 retval = SDL_SemTryWait(sem);
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119 if ( retval == 0 ) {
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120 break;
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121 }
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122 SDL_Delay(1);
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123 } while ( SDL_GetTicks() < timeout );
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124
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125 return retval;
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126 }
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127
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128 Uint32 SDL_SemValue(SDL_sem *sem)
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129 {
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130 int ret = 0;
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131 if ( sem ) {
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132 sem_getvalue(&sem->sem, &ret);
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133 if ( ret < 0 ) {
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134 ret = 0;
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135 }
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136 }
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137 return (Uint32)ret;
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138 }
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139
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140 int SDL_SemPost(SDL_sem *sem)
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141 {
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142 int retval;
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143
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144 if ( ! sem ) {
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145 SDL_SetError("Passed a NULL semaphore");
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146 return -1;
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147 }
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148
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149 retval = sem_post(&sem->sem);
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150 if ( retval < 0 ) {
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151 SDL_SetError("sem_post() failed");
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152 }
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153 return retval;
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154 }
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155
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156 #endif /* __MACOSX__ */