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annotate src/thread/dc/SDL_syssem.c @ 1399:c35c161a1100

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author Sam Lantinga <slouken@libsdl.org>
date Mon, 20 Feb 2006 23:18:49 +0000
parents 19418e4422cb
children d910939febfa
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 "SDL_timer.h"
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26 #include "SDL_thread.h"
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27 #include "SDL_systhread_c.h"
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28
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29
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30 #if SDL_THREADS_DISABLED
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31
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32 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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33 {
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34 SDL_SetError("SDL not configured with thread support");
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35 return (SDL_sem *)0;
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36 }
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37
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38 void SDL_DestroySemaphore(SDL_sem *sem)
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39 {
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40 return;
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41 }
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42
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43 int SDL_SemTryWait(SDL_sem *sem)
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44 {
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45 SDL_SetError("SDL not configured with thread support");
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46 return -1;
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47 }
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48
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49 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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50 {
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51 SDL_SetError("SDL not configured with thread support");
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52 return -1;
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53 }
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54
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55 int SDL_SemWait(SDL_sem *sem)
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56 {
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57 SDL_SetError("SDL not configured with thread support");
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58 return -1;
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59 }
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60
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61 Uint32 SDL_SemValue(SDL_sem *sem)
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62 {
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63 return 0;
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64 }
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65
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66 int SDL_SemPost(SDL_sem *sem)
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67 {
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68 SDL_SetError("SDL not configured with thread support");
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69 return -1;
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70 }
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71
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72 #else
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73
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74 #include <kos/sem.h>
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75
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76 struct SDL_semaphore
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77 {
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78 semaphore_t sem;
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79 };
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80
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81 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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82 {
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83 return (SDL_sem *)sem_create(initial_value);
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84 }
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85
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86 /* WARNING:
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87 You cannot call this function when another thread is using the semaphore.
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88 */
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89 void SDL_DestroySemaphore(SDL_sem *sem)
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90 {
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91 if ( ! sem ) {
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92 SDL_SetError("Passed a NULL semaphore");
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93 return;
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94 }
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95
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96 sem_destroy(&sem->sem);
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97 }
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98
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99 int SDL_SemTryWait(SDL_sem *sem)
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100 {
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101 int retval;
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102
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103 if ( ! sem ) {
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104 SDL_SetError("Passed a NULL semaphore");
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105 return -1;
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106 }
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107
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108 retval = sem_trywait(&sem->sem);
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109 if (retval==0) return 0;
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110 else return SDL_MUTEX_TIMEDOUT;
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111
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112 return retval;
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113 }
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114
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115 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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116 {
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117 int retval;
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118
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119 if ( ! sem ) {
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120 SDL_SetError("Passed a NULL semaphore");
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121 return -1;
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122 }
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123
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124 /* A timeout of 0 is an easy case */
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125 if ( timeout == 0 ) {
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126 return SDL_SemTryWait(sem);
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127 }
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128
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129 retval = sem_wait_timed(&sem->sem,timeout);
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130 if (retval==-1) retval= SDL_MUTEX_TIMEDOUT;
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131
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132 return retval;
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133 }
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134
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135 int SDL_SemWait(SDL_sem *sem)
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136 {
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137 if ( ! sem ) {
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138 SDL_SetError("Passed a NULL semaphore");
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139 return -1;
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140 }
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141
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142 sem_wait(&sem->sem);
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143 return 0;
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144 }
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145
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146 Uint32 SDL_SemValue(SDL_sem *sem)
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147 {
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148 if ( ! sem ) {
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149 SDL_SetError("Passed a NULL semaphore");
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150 return -1;
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151 }
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152
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153 return sem_count(&sem->sem);
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154 }
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155
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156 int SDL_SemPost(SDL_sem *sem)
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157 {
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158 if ( ! sem ) {
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159 SDL_SetError("Passed a NULL semaphore");
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160 return -1;
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161 }
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162
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163 sem_signal(&sem->sem);
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164 return 0;
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165 }
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166
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167 #endif /* SDL_THREADS_DISABLED */