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annotate src/thread/riscos/SDL_syssem.c @ 955:d74fbf56f2f6

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Date: Fri, 25 Jun 2004 13:29:15 +0100 From: "alan buckley" Subject: Modification for RISC OS version of SDL Ive attached a zip file with the changes to this email, it contains the following: The file sdldiff.txt is the output from cvs diff u. . The directory thread/riscos contains all the new files to support threading. Readme.riscos is a new readme file to add.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 17 Sep 2004 13:20:10 +0000
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children 1ccbb2b7d905
rev   line source
955
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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 doesn't have semiphores so use code based on generic implementation */
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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 /* An implementation of semaphores using mutexes and condition variables */
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31
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32 #include <stdlib.h>
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33
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34 #include "SDL_error.h"
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35 #include "SDL_timer.h"
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36 #include "SDL_thread.h"
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37
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38 #include "SDL_systhread_c.h"
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39
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40 #ifdef DISABLE_THREADS
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41
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42 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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43 {
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44 SDL_SetError("SDL not configured with thread support");
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45 return (SDL_sem *)0;
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46 }
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47
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48 void SDL_DestroySemaphore(SDL_sem *sem)
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49 {
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50 return;
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51 }
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52
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53 int SDL_SemTryWait(SDL_sem *sem)
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54 {
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55 SDL_SetError("SDL not configured with thread support");
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56 return -1;
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57 }
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58
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59 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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60 {
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61 SDL_SetError("SDL not configured with thread support");
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62 return -1;
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63 }
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64
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65 int SDL_SemWait(SDL_sem *sem)
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66 {
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67 SDL_SetError("SDL not configured with thread support");
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68 return -1;
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69 }
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70
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71 Uint32 SDL_SemValue(SDL_sem *sem)
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72 {
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73 return 0;
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74 }
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75
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76 int SDL_SemPost(SDL_sem *sem)
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77 {
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78 SDL_SetError("SDL not configured with thread support");
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79 return -1;
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80 }
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81
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82 #else
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83
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84 struct SDL_semaphore
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85 {
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86 Uint32 count;
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87 Uint32 waiters_count;
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88 SDL_mutex *count_lock;
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89 SDL_cond *count_nonzero;
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90 };
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91
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92 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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93 {
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94 SDL_sem *sem;
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95
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96 sem = (SDL_sem *)malloc(sizeof(*sem));
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97 if ( ! sem ) {
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98 SDL_OutOfMemory();
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99 return(0);
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100 }
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101 sem->count = initial_value;
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102 sem->waiters_count = 0;
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103
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104 sem->count_lock = SDL_CreateMutex();
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105 sem->count_nonzero = SDL_CreateCond();
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106 if ( ! sem->count_lock || ! sem->count_nonzero ) {
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107 SDL_DestroySemaphore(sem);
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108 return(0);
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109 }
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110
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111 return(sem);
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112 }
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113
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114 /* WARNING:
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115 You cannot call this function when another thread is using the semaphore.
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116 */
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117 void SDL_DestroySemaphore(SDL_sem *sem)
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118 {
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119 if ( sem ) {
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120 sem->count = 0xFFFFFFFF;
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121 while ( sem->waiters_count > 0) {
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122 SDL_CondSignal(sem->count_nonzero);
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123 SDL_Delay(10);
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124 }
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125 SDL_DestroyCond(sem->count_nonzero);
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126 SDL_mutexP(sem->count_lock);
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127 SDL_mutexV(sem->count_lock);
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128 SDL_DestroyMutex(sem->count_lock);
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129 free(sem);
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130 }
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131 }
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132
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133 int SDL_SemTryWait(SDL_sem *sem)
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134 {
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135 int retval;
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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 retval = SDL_MUTEX_TIMEDOUT;
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143 SDL_LockMutex(sem->count_lock);
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144 if ( sem->count > 0 ) {
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145 --sem->count;
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146 retval = 0;
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147 }
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148 SDL_UnlockMutex(sem->count_lock);
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149
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150 return retval;
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151 }
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152
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153 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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154 {
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155 int retval;
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156
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157 if ( ! sem ) {
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158 SDL_SetError("Passed a NULL semaphore");
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159 return -1;
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160 }
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161
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162 /* A timeout of 0 is an easy case */
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163 if ( timeout == 0 ) {
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164 return SDL_SemTryWait(sem);
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165 }
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166
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167 SDL_LockMutex(sem->count_lock);
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168 ++sem->waiters_count;
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169 retval = 0;
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170 while ( (sem->count == 0) && (retval != SDL_MUTEX_TIMEDOUT) ) {
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171 retval = SDL_CondWaitTimeout(sem->count_nonzero,
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172 sem->count_lock, timeout);
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173 }
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174 --sem->waiters_count;
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175 --sem->count;
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176 SDL_UnlockMutex(sem->count_lock);
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177
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178 return retval;
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179 }
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180
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181 int SDL_SemWait(SDL_sem *sem)
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182 {
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183 return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT);
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184 }
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185
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186 Uint32 SDL_SemValue(SDL_sem *sem)
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187 {
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188 Uint32 value;
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189
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190 value = 0;
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191 if ( sem ) {
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192 SDL_LockMutex(sem->count_lock);
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193 value = sem->count;
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194 SDL_UnlockMutex(sem->count_lock);
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195 }
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196 return value;
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197 }
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198
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199 int SDL_SemPost(SDL_sem *sem)
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200 {
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201 if ( ! sem ) {
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202 SDL_SetError("Passed a NULL semaphore");
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203 return -1;
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204 }
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205
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206 SDL_LockMutex(sem->count_lock);
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207 if ( sem->waiters_count > 0 ) {
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208 SDL_CondSignal(sem->count_nonzero);
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209 }
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210 ++sem->count;
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211 SDL_UnlockMutex(sem->count_lock);
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212
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213 return 0;
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214 }
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215
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216 #endif /* DISABLE_THREADS */