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annotate src/thread/riscos/SDL_syssem.c @ 1099:1ccbb2b7d905

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Date: Fri, 15 Jul 2005 08:29:01 +0100 From: "alan buckley" Subject: SDL Improved semiphore implementation for RISC OS (version 2) I've attached a new version of the patch for the RISC OS semaphore processing (in a zip file) that updates it to use the improved semaphores support in UnixLiib.
author Sam Lantinga <slouken@libsdl.org>
date Thu, 21 Jul 2005 06:19:18 +0000
parents d74fbf56f2f6
children c9b51268668f
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 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 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 /* RISC OS semiphores based on linux code */
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24
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25 #ifdef SAVE_RCSID
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26 static char rcsid =
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27 "@(#) $Id$";
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28 #endif
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29
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30
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31 #include <stdlib.h>
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32
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33 #include "SDL_error.h"
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34 #include "SDL_timer.h"
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35 #include "SDL_thread.h"
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36
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37 #include "SDL_systhread_c.h"
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38
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39 #ifdef DISABLE_THREADS
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40
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41 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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42 {
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43 SDL_SetError("SDL not configured with thread support");
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44 return (SDL_sem *)0;
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45 }
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46
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47 void SDL_DestroySemaphore(SDL_sem *sem)
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48 {
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49 return;
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50 }
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51
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52 int SDL_SemTryWait(SDL_sem *sem)
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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_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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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 int SDL_SemWait(SDL_sem *sem)
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65 {
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66 SDL_SetError("SDL not configured with thread support");
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67 return -1;
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68 }
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69
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70 Uint32 SDL_SemValue(SDL_sem *sem)
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71 {
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72 return 0;
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73 }
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74
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75 int SDL_SemPost(SDL_sem *sem)
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76 {
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77 SDL_SetError("SDL not configured with thread support");
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78 return -1;
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79 }
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80
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81 #else
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82
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83
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84 #include <stdio.h>
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85 #include <stdlib.h>
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86 #include <unistd.h> /* For getpid() */
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87 #include <pthread.h>
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88 #include <semaphore.h>
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89
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90 struct SDL_semaphore {
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91 sem_t *sem;
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92 sem_t sem_data;
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93 };
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94
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95 /* Create a semaphore, initialized with value */
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96 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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97 {
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98 SDL_sem *sem = (SDL_sem *) malloc(sizeof(SDL_sem));
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99 if ( sem ) {
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100 if ( sem_init(&sem->sem_data, 0, initial_value) < 0 ) {
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101 SDL_SetError("sem_init() failed");
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102 free(sem);
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103 sem = NULL;
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104 } else {
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105 sem->sem = &sem->sem_data;
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106 }
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107 } else {
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108 SDL_OutOfMemory();
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109 }
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110 return sem;
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111 }
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112
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113 void SDL_DestroySemaphore(SDL_sem *sem)
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114 {
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115 if ( sem ) {
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116 sem_destroy(sem->sem);
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117 free(sem);
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118 }
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119 }
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120
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121 int SDL_SemTryWait(SDL_sem *sem)
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122 {
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123 int retval;
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124
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125 if ( ! sem ) {
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126 SDL_SetError("Passed a NULL semaphore");
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127 return -1;
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128 }
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129 retval = SDL_MUTEX_TIMEDOUT;
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130 if ( sem_trywait(sem->sem) == 0 ) {
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131 retval = 0;
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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 int retval;
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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 retval = sem_wait(sem->sem);
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146 if ( retval < 0 ) {
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147 SDL_SetError("sem_wait() failed");
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148 }
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149 return retval;
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150 }
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151
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152 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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153 {
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154 int retval;
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155
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156 if ( ! sem ) {
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157 SDL_SetError("Passed a NULL semaphore");
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158 return -1;
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159 }
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160
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161 /* Try the easy cases first */
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162 if ( timeout == 0 ) {
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163 return SDL_SemTryWait(sem);
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164 }
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165 if ( timeout == SDL_MUTEX_MAXWAIT ) {
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166 return SDL_SemWait(sem);
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167 }
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168
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169 /* Ack! We have to busy wait... */
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170 timeout += SDL_GetTicks();
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171 do {
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172 retval = SDL_SemTryWait(sem);
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173 if ( retval == 0 ) {
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174 break;
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175 }
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176 SDL_Delay(1);
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177 } while ( SDL_GetTicks() < timeout );
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178
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179 return retval;
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180 }
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181
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182 Uint32 SDL_SemValue(SDL_sem *sem)
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183 {
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184 int ret = 0;
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185 if ( sem ) {
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186 sem_getvalue(sem->sem, &ret);
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187 if ( ret < 0 ) {
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188 ret = 0;
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189 }
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190 }
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191 return (Uint32)ret;
955
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192 }
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193
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194 int SDL_SemPost(SDL_sem *sem)
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195 {
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196 int retval;
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197
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198 if ( ! sem ) {
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199 SDL_SetError("Passed a NULL semaphore");
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200 return -1;
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201 }
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202
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203 retval = sem_post(sem->sem);
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204 if ( retval < 0 ) {
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205 SDL_SetError("sem_post() failed");
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206 }
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207 return retval;
955
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208 }
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209
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210 #endif /* DISABLE_THREADS */