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annotate src/thread/pthread/SDL_syssem.c @ 1635:92947e3a18db

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Make sure code is only compiled if the appropriate subsystem is enabled
author Sam Lantinga <slouken@libsdl.org>
date Fri, 14 Apr 2006 04:46:47 +0000
parents eba962f9d603
children 782fd950bd46 536b0704b7d8
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 /* Mac OS X doesn't support sem_getvalue() as of version 10.4 */
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34 #include "../generic/SDL_syssem.c"
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35 #else
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36
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37 struct SDL_semaphore {
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38 sem_t sem;
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39 };
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40
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41 /* Create a semaphore, initialized with value */
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42 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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43 {
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44 SDL_sem *sem = (SDL_sem *) SDL_malloc(sizeof(SDL_sem));
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45 if ( sem ) {
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46 if ( sem_init(&sem->sem, 0, initial_value) < 0 ) {
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47 SDL_SetError("sem_init() failed");
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48 SDL_free(sem);
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49 sem = NULL;
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50 }
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51 } else {
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52 SDL_OutOfMemory();
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53 }
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54 return sem;
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55 }
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56
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57 void SDL_DestroySemaphore(SDL_sem *sem)
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58 {
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59 if ( sem ) {
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60 sem_destroy(&sem->sem);
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61 SDL_free(sem);
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62 }
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63 }
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64
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65 int SDL_SemTryWait(SDL_sem *sem)
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66 {
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67 int retval;
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68
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69 if ( ! sem ) {
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70 SDL_SetError("Passed a NULL semaphore");
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71 return -1;
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72 }
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73 retval = SDL_MUTEX_TIMEDOUT;
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74 if ( sem_trywait(&sem->sem) == 0 ) {
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75 retval = 0;
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76 }
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77 return retval;
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78 }
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79
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80 int SDL_SemWait(SDL_sem *sem)
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81 {
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82 int retval;
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83
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84 if ( ! sem ) {
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85 SDL_SetError("Passed a NULL semaphore");
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86 return -1;
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87 }
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88
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89 retval = sem_wait(&sem->sem);
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90 if ( retval < 0 ) {
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91 SDL_SetError("sem_wait() failed");
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92 }
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93 return retval;
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94 }
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95
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96 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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97 {
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98 int retval;
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99
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100 if ( ! sem ) {
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101 SDL_SetError("Passed a NULL semaphore");
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102 return -1;
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103 }
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104
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105 /* Try the easy cases first */
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106 if ( timeout == 0 ) {
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107 return SDL_SemTryWait(sem);
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108 }
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109 if ( timeout == SDL_MUTEX_MAXWAIT ) {
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110 return SDL_SemWait(sem);
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111 }
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112
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113 /* Ack! We have to busy wait... */
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114 /* FIXME: Use sem_timedwait()? */
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115 timeout += SDL_GetTicks();
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116 do {
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117 retval = SDL_SemTryWait(sem);
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118 if ( retval == 0 ) {
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119 break;
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120 }
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121 SDL_Delay(1);
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122 } while ( SDL_GetTicks() < timeout );
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123
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124 return retval;
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125 }
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126
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127 Uint32 SDL_SemValue(SDL_sem *sem)
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128 {
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129 int ret = 0;
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130 if ( sem ) {
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131 sem_getvalue(&sem->sem, &ret);
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132 if ( ret < 0 ) {
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133 ret = 0;
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134 }
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135 }
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136 return (Uint32)ret;
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137 }
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138
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139 int SDL_SemPost(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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148 retval = sem_post(&sem->sem);
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149 if ( retval < 0 ) {
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150 SDL_SetError("sem_post() failed");
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151 }
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152 return retval;
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153 }
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154
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155 #endif /* __MACOSX__ */