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annotate src/thread/dc/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 d910939febfa
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 /* An implementation of semaphores using mutexes and condition variables */
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25
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26 #include "SDL_timer.h"
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27 #include "SDL_thread.h"
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28 #include "SDL_systhread_c.h"
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29
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30
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31 #if SDL_THREADS_DISABLED
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32
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33 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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34 {
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35 SDL_SetError("SDL not configured with thread support");
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36 return (SDL_sem *)0;
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37 }
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38
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39 void SDL_DestroySemaphore(SDL_sem *sem)
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40 {
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41 return;
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42 }
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43
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44 int SDL_SemTryWait(SDL_sem *sem)
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45 {
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46 SDL_SetError("SDL not configured with thread support");
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47 return -1;
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48 }
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49
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50 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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51 {
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52 SDL_SetError("SDL not configured with thread support");
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53 return -1;
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54 }
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55
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56 int SDL_SemWait(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 Uint32 SDL_SemValue(SDL_sem *sem)
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63 {
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64 return 0;
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65 }
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66
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67 int SDL_SemPost(SDL_sem *sem)
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68 {
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69 SDL_SetError("SDL not configured with thread support");
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70 return -1;
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71 }
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72
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73 #else
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74
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75 #include <kos/sem.h>
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76
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77 struct SDL_semaphore
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78 {
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79 semaphore_t sem;
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80 };
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81
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82 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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83 {
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84 return (SDL_sem *)sem_create(initial_value);
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85 }
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86
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87 /* WARNING:
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88 You cannot call this function when another thread is using the semaphore.
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89 */
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90 void SDL_DestroySemaphore(SDL_sem *sem)
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91 {
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92 if ( ! sem ) {
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93 SDL_SetError("Passed a NULL semaphore");
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94 return;
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95 }
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96
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97 sem_destroy(&sem->sem);
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98 }
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99
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100 int SDL_SemTryWait(SDL_sem *sem)
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101 {
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102 int retval;
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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 -1;
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107 }
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108
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109 retval = sem_trywait(&sem->sem);
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110 if (retval==0) return 0;
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111 else return SDL_MUTEX_TIMEDOUT;
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112
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113 return retval;
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114 }
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115
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116 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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117 {
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118 int retval;
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119
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120 if ( ! sem ) {
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121 SDL_SetError("Passed a NULL semaphore");
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122 return -1;
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123 }
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124
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125 /* A timeout of 0 is an easy case */
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126 if ( timeout == 0 ) {
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127 return SDL_SemTryWait(sem);
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128 }
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129
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130 retval = sem_wait_timed(&sem->sem,timeout);
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131 if (retval==-1) retval= SDL_MUTEX_TIMEDOUT;
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132
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133 return retval;
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134 }
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135
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136 int SDL_SemWait(SDL_sem *sem)
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137 {
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138 if ( ! sem ) {
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139 SDL_SetError("Passed a NULL semaphore");
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140 return -1;
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141 }
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142
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143 sem_wait(&sem->sem);
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144 return 0;
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145 }
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146
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147 Uint32 SDL_SemValue(SDL_sem *sem)
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148 {
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149 if ( ! sem ) {
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150 SDL_SetError("Passed a NULL semaphore");
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151 return -1;
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152 }
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153
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154 return sem_count(&sem->sem);
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155 }
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156
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157 int SDL_SemPost(SDL_sem *sem)
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158 {
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159 if ( ! sem ) {
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160 SDL_SetError("Passed a NULL semaphore");
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161 return -1;
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162 }
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163
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164 sem_signal(&sem->sem);
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165 return 0;
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166 }
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167
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168 #endif /* SDL_THREADS_DISABLED */