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annotate src/thread/riscos/SDL_syssem.c @ 998:0e6627072f7a

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Date: Wed, 24 Nov 2004 01:25:48 +0100 From: Stephane Marchesin Subject: Re: [SDL] Problem compiling SDL 1.2.7 - there is a bug that was introduced in the kernel headers for 2.6.9 which is fixed in 2.6.10. This bug *will* byte when compiling the cdrom subsystem. A patch that works around this bug is attached. Note that users affected are not those running 2.6.9, but those using the 2.6.9 kernel headers for their system (i.e. whose libc is built against 2.6.9 headers).
author Sam Lantinga <slouken@libsdl.org>
date Tue, 30 Nov 2004 14:45:08 +0000
parents d74fbf56f2f6
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 */