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annotate src/thread/riscos/SDL_syssem.c @ 1567:12b6d331d82a

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Good idea, renaming OpenBSD audio to BSD audio.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 21 Mar 2006 09:33:54 +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 /* RISC OS semiphores based on linux code */
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25
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26
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27 #include "SDL_timer.h"
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28 #include "SDL_thread.h"
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29 #include "SDL_systhread_c.h"
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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
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76 #include <unistd.h> /* For getpid() */
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77 #include <pthread.h>
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78 #include <semaphore.h>
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79
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80 struct SDL_semaphore {
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81 sem_t *sem;
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82 sem_t sem_data;
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83 };
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84
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85 /* Create a semaphore, initialized with value */
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86 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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87 {
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88 SDL_sem *sem = (SDL_sem *) SDL_malloc(sizeof(SDL_sem));
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89 if ( sem ) {
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90 if ( sem_init(&sem->sem_data, 0, initial_value) < 0 ) {
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91 SDL_SetError("sem_init() failed");
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92 SDL_free(sem);
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93 sem = NULL;
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94 } else {
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95 sem->sem = &sem->sem_data;
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96 }
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97 } else {
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98 SDL_OutOfMemory();
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99 }
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100 return sem;
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101 }
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102
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103 void SDL_DestroySemaphore(SDL_sem *sem)
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104 {
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105 if ( sem ) {
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106 sem_destroy(sem->sem);
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107 SDL_free(sem);
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108 }
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109 }
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110
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111 int SDL_SemTryWait(SDL_sem *sem)
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112 {
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113 int retval;
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114
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115 if ( ! sem ) {
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116 SDL_SetError("Passed a NULL semaphore");
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117 return -1;
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118 }
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119 retval = SDL_MUTEX_TIMEDOUT;
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120 if ( sem_trywait(sem->sem) == 0 ) {
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121 retval = 0;
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122 }
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123 return retval;
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124 }
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125
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126 int SDL_SemWait(SDL_sem *sem)
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127 {
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128 int retval;
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129
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130 if ( ! sem ) {
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131 SDL_SetError("Passed a NULL semaphore");
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132 return -1;
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133 }
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134
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135 retval = sem_wait(sem->sem);
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136 if ( retval < 0 ) {
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137 SDL_SetError("sem_wait() failed");
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138 }
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139 return retval;
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140 }
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141
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142 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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143 {
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144 int retval;
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145
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146 if ( ! sem ) {
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147 SDL_SetError("Passed a NULL semaphore");
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148 return -1;
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149 }
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150
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151 /* Try the easy cases first */
955
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152 if ( timeout == 0 ) {
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153 return SDL_SemTryWait(sem);
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154 }
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155 if ( timeout == SDL_MUTEX_MAXWAIT ) {
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156 return SDL_SemWait(sem);
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157 }
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158
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159 /* Ack! We have to busy wait... */
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160 timeout += SDL_GetTicks();
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161 do {
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162 retval = SDL_SemTryWait(sem);
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163 if ( retval == 0 ) {
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164 break;
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165 }
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166 SDL_Delay(1);
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167 } while ( SDL_GetTicks() < timeout );
955
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168
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169 return retval;
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170 }
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171
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172 Uint32 SDL_SemValue(SDL_sem *sem)
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173 {
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174 int ret = 0;
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175 if ( sem ) {
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176 sem_getvalue(sem->sem, &ret);
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177 if ( ret < 0 ) {
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178 ret = 0;
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179 }
955
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180 }
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181 return (Uint32)ret;
955
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182 }
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183
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184 int SDL_SemPost(SDL_sem *sem)
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185 {
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186 int retval;
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187
955
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188 if ( ! sem ) {
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189 SDL_SetError("Passed a NULL semaphore");
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190 return -1;
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191 }
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192
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193 retval = sem_post(sem->sem);
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194 if ( retval < 0 ) {
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195 SDL_SetError("sem_post() failed");
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196 }
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197 return retval;
955
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198 }
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199
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
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200 #endif /* !SDL_THREADS_DISABLED */