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annotate src/thread/pthread/SDL_syssem.c @ 1790:828a17e05192

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Date: Mon, 8 May 2006 14:19:30 -0700 From: Bob Ippolito Subject: SDL trunk (r2346) and Mac OS X The current state of the trunk doesn't quite compile on Mac OS X, I've attached a series of patches that gets it to compile and kills a few warnings. sdl-trunk-r2346-dlcompat-warnings.diff: The dlcompat thing is just loaded with incorrect type signatures .. some of them have changed since 10.2 and others are just flat wrong. This puts it in sync with the latest headers. People on 10.2 will get the warnings instead of people with new kits.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 09 May 2006 07:26:58 +0000
parents eba962f9d603
children 782fd950bd46 536b0704b7d8
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
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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__ */