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annotate src/thread/dc/SDL_syssem.c @ 1312:c9b51268668f

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Updated copyright information and removed rcs id lines (problematic in branch merges) I batch edited these files, so please let me know if I've accidentally removed anybody's credit here.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 01 Feb 2006 06:32:25 +0000
parents b8d311d90021
children 604d73db6802
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
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23 /* An implementation of semaphores using mutexes and condition variables */
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24
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25 #include <stdlib.h>
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26
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27 #include "SDL_error.h"
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28 #include "SDL_timer.h"
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29 #include "SDL_thread.h"
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30 #include "SDL_systhread_c.h"
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31
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32
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33 #ifdef DISABLE_THREADS
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34
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35 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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36 {
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37 SDL_SetError("SDL not configured with thread support");
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38 return (SDL_sem *)0;
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39 }
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40
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41 void SDL_DestroySemaphore(SDL_sem *sem)
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42 {
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43 return;
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44 }
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45
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46 int SDL_SemTryWait(SDL_sem *sem)
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47 {
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48 SDL_SetError("SDL not configured with thread support");
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49 return -1;
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50 }
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51
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52 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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53 {
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54 SDL_SetError("SDL not configured with thread support");
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55 return -1;
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56 }
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57
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58 int SDL_SemWait(SDL_sem *sem)
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59 {
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60 SDL_SetError("SDL not configured with thread support");
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61 return -1;
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62 }
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63
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64 Uint32 SDL_SemValue(SDL_sem *sem)
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65 {
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66 return 0;
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67 }
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68
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69 int SDL_SemPost(SDL_sem *sem)
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70 {
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71 SDL_SetError("SDL not configured with thread support");
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72 return -1;
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73 }
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74
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75 #else
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76
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77 #include <kos/sem.h>
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78
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79 struct SDL_semaphore
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80 {
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81 semaphore_t sem;
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82 };
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83
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84 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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85 {
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86 return (SDL_sem *)sem_create(initial_value);
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87 }
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88
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89 /* WARNING:
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90 You cannot call this function when another thread is using the semaphore.
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91 */
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92 void SDL_DestroySemaphore(SDL_sem *sem)
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93 {
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94 if ( ! sem ) {
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95 SDL_SetError("Passed a NULL semaphore");
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96 return;
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97 }
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98
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99 sem_destroy(&sem->sem);
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100 }
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101
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102 int SDL_SemTryWait(SDL_sem *sem)
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103 {
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104 int retval;
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105
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106 if ( ! sem ) {
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107 SDL_SetError("Passed a NULL semaphore");
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108 return -1;
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109 }
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110
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111 retval = sem_trywait(&sem->sem);
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112 if (retval==0) return 0;
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113 else return SDL_MUTEX_TIMEDOUT;
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114
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115 return retval;
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116 }
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117
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118 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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119 {
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120 int retval;
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121
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122 if ( ! sem ) {
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123 SDL_SetError("Passed a NULL semaphore");
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124 return -1;
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125 }
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126
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127 /* A timeout of 0 is an easy case */
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128 if ( timeout == 0 ) {
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129 return SDL_SemTryWait(sem);
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130 }
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131
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132 retval = sem_wait_timed(&sem->sem,timeout);
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133 if (retval==-1) retval= SDL_MUTEX_TIMEDOUT;
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134
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135 return retval;
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136 }
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137
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138 int SDL_SemWait(SDL_sem *sem)
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139 {
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140 if ( ! sem ) {
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141 SDL_SetError("Passed a NULL semaphore");
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142 return -1;
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143 }
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144
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145 sem_wait(&sem->sem);
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146 return 0;
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147 }
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148
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149 Uint32 SDL_SemValue(SDL_sem *sem)
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150 {
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151 if ( ! sem ) {
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152 SDL_SetError("Passed a NULL semaphore");
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153 return -1;
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154 }
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155
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156 return sem_count(&sem->sem);
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157 }
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158
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159 int SDL_SemPost(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 sem_signal(&sem->sem);
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167 return 0;
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168 }
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169
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170 #endif /* DISABLE_THREADS */