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annotate src/thread/dc/SDL_syssem.c @ 588:2c6510c0a304

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Darrell added support for emulated SDL_DOUBLEBUF on MacOSX
author Sam Lantinga <slouken@libsdl.org>
date Sat, 01 Feb 2003 19:59:23 +0000
parents dad72daf44b3
children b8d311d90021
rev   line source
509
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 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 BERO
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20 bero@geocities.co.jp
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21
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22 based on generic/SDL_syssem.c
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23
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24 Sam Lantinga
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25 slouken@libsdl.org
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26 */
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27
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28 #ifdef SAVE_RCSID
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29 static char rcsid =
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30 "@(#) $Id$";
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31 #endif
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32
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33 /* An implementation of semaphores using mutexes and condition variables */
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34
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35 #include <stdlib.h>
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36
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37 #include "SDL_error.h"
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38 #include "SDL_timer.h"
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39 #include "SDL_thread.h"
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40 #include "SDL_systhread_c.h"
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41
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42
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43 #ifdef DISABLE_THREADS
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44
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45 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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46 {
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47 SDL_SetError("SDL not configured with thread support");
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48 return (SDL_sem *)0;
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49 }
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50
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51 void SDL_DestroySemaphore(SDL_sem *sem)
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52 {
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53 return;
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54 }
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55
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56 int SDL_SemTryWait(SDL_sem *sem)
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57 {
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58 SDL_SetError("SDL not configured with thread support");
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59 return -1;
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60 }
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61
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62 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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63 {
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64 SDL_SetError("SDL not configured with thread support");
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65 return -1;
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66 }
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67
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68 int SDL_SemWait(SDL_sem *sem)
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69 {
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70 SDL_SetError("SDL not configured with thread support");
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71 return -1;
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72 }
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73
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74 Uint32 SDL_SemValue(SDL_sem *sem)
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75 {
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76 return 0;
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77 }
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78
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79 int SDL_SemPost(SDL_sem *sem)
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80 {
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81 SDL_SetError("SDL not configured with thread support");
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82 return -1;
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83 }
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84
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85 #else
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86
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87 #include <kos/sem.h>
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88
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89 struct SDL_semaphore
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90 {
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91 semaphore_t sem;
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92 };
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93
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94 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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95 {
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96 return (SDL_sem *)sem_create(initial_value);
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97 }
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98
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99 /* WARNING:
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100 You cannot call this function when another thread is using the semaphore.
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101 */
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102 void SDL_DestroySemaphore(SDL_sem *sem)
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103 {
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104 if ( ! sem ) {
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105 SDL_SetError("Passed a NULL semaphore");
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106 return;
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107 }
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108
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109 sem_destroy(&sem->sem);
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110 }
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111
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112 int SDL_SemTryWait(SDL_sem *sem)
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113 {
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114 int retval;
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115
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116 if ( ! sem ) {
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117 SDL_SetError("Passed a NULL semaphore");
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118 return -1;
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119 }
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120
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121 retval = sem_trywait(&sem->sem);
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122 if (retval==0) return 0;
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123 else return SDL_MUTEX_TIMEDOUT;
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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 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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129 {
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130 int retval;
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131
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132 if ( ! sem ) {
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133 SDL_SetError("Passed a NULL semaphore");
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134 return -1;
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135 }
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136
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137 /* A timeout of 0 is an easy case */
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138 if ( timeout == 0 ) {
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139 return SDL_SemTryWait(sem);
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140 }
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141
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142 retval = sem_wait_timed(&sem->sem,timeout);
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143 if (retval==-1) retval= SDL_MUTEX_TIMEDOUT;
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144
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145 return retval;
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146 }
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147
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148 int SDL_SemWait(SDL_sem *sem)
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149 {
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150 if ( ! sem ) {
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151 SDL_SetError("Passed a NULL semaphore");
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152 return -1;
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153 }
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154
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155 sem_wait(&sem->sem);
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156 return 0;
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157 }
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158
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159 Uint32 SDL_SemValue(SDL_sem *sem)
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160 {
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161 if ( ! sem ) {
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162 SDL_SetError("Passed a NULL semaphore");
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163 return -1;
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164 }
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165
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166 return sem_count(&sem->sem);
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167 }
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168
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169 int SDL_SemPost(SDL_sem *sem)
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170 {
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171 if ( ! sem ) {
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172 SDL_SetError("Passed a NULL semaphore");
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173 return -1;
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174 }
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175
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176 sem_signal(&sem->sem);
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177 return 0;
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178 }
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179
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180 #endif /* DISABLE_THREADS */