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annotate src/thread/riscos/SDL_syssem.c @ 1118:65f4b2dd46b7

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Date: Wed, 17 Aug 2005 11:23:40 -0400 From: Matt L <prometheus.uw@gmail.com> To: "Ryan C. Gordon" <icculus@clutteredmind.org> Subject: SDL Patch Hio, I saw your last call on the mailing list. Here's a patch which I submitted about two weeks ago which hasn't made it in. In the current sdl.m4, there's a bug where if your configure.ac, you have AC_LANG(C++) specified, it won't properly compile and link the SDL test program when you run the configure script. This is because only the default CFLAGS is overriden in sdl.m4, and in the patch below, I've fixed it so it overrides CXXFLAGS as well, allowing it to work with g++.
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 18 Aug 2005 06:06:02 +0000
parents 1ccbb2b7d905
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 {
955
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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 ) {
955
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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 */
955
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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 }
955
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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 );
955
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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 }
955
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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
955
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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");
955
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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 */