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annotate src/thread/riscos/SDL_syssem.c @ 4235:88aa213ffc7b SDL-1.2

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Possibly fixed bug #601, definitely fixed a potential issue with threads stopping and starting in rapid succession.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 23 Sep 2009 06:35:28 +0000
parents a1b03ba2fcd0
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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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536b0704b7d8 Make sure sem_wait didn't return early with EINTR. Fixes Bugzilla #231.
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22
536b0704b7d8 Make sure sem_wait didn't return early with EINTR. Fixes Bugzilla #231.
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23 #include <errno.h>
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24
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25 #include "SDL_config.h"
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26
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27 /* RISC OS semiphores based on linux code */
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28
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29
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30 #include "SDL_timer.h"
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31 #include "SDL_thread.h"
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32 #include "SDL_systhread_c.h"
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33
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34 #if !SDL_THREADS_DISABLED
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35
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36 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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37 {
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38 SDL_SetError("SDL not configured with thread support");
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39 return (SDL_sem *)0;
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40 }
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41
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42 void SDL_DestroySemaphore(SDL_sem *sem)
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43 {
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44 return;
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45 }
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46
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47 int SDL_SemTryWait(SDL_sem *sem)
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48 {
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49 SDL_SetError("SDL not configured with thread support");
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50 return -1;
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51 }
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52
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53 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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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_SemWait(SDL_sem *sem)
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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 Uint32 SDL_SemValue(SDL_sem *sem)
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66 {
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67 return 0;
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68 }
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69
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70 int SDL_SemPost(SDL_sem *sem)
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71 {
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72 SDL_SetError("SDL not configured with thread support");
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73 return -1;
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74 }
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75
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76 #else
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77
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78
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79 #include <unistd.h> /* For getpid() */
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80 #include <pthread.h>
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81 #include <semaphore.h>
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82
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83 struct SDL_semaphore {
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84 sem_t *sem;
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85 sem_t sem_data;
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86 };
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87
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88 /* Create a semaphore, initialized with value */
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89 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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90 {
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91 SDL_sem *sem = (SDL_sem *) SDL_malloc(sizeof(SDL_sem));
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92 if ( sem ) {
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93 if ( sem_init(&sem->sem_data, 0, initial_value) < 0 ) {
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94 SDL_SetError("sem_init() failed");
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95 SDL_free(sem);
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96 sem = NULL;
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97 } else {
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98 sem->sem = &sem->sem_data;
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99 }
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100 } else {
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101 SDL_OutOfMemory();
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102 }
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103 return sem;
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104 }
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105
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106 void SDL_DestroySemaphore(SDL_sem *sem)
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107 {
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108 if ( sem ) {
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109 sem_destroy(sem->sem);
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110 SDL_free(sem);
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111 }
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112 }
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113
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114 int SDL_SemTryWait(SDL_sem *sem)
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115 {
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116 int retval;
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117
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118 if ( ! sem ) {
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119 SDL_SetError("Passed a NULL semaphore");
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120 return -1;
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121 }
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122 retval = SDL_MUTEX_TIMEDOUT;
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123 if ( sem_trywait(sem->sem) == 0 ) {
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124 retval = 0;
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125 }
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126 return retval;
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127 }
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128
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129 int SDL_SemWait(SDL_sem *sem)
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130 {
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131 int retval;
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132
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133 if ( ! sem ) {
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134 SDL_SetError("Passed a NULL semaphore");
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135 return -1;
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136 }
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137
1851
536b0704b7d8 Make sure sem_wait didn't return early with EINTR. Fixes Bugzilla #231.
Ryan C. Gordon <icculus@icculus.org>
parents: 1402
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138 while ( ((retval = sem_wait(sem->sem)) == -1) && (errno == EINTR) ) {}
1099
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139 if ( retval < 0 ) {
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140 SDL_SetError("sem_wait() failed");
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141 }
955
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142 return retval;
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143 }
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144
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145 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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146 {
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147 int retval;
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148
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149 if ( ! sem ) {
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150 SDL_SetError("Passed a NULL semaphore");
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151 return -1;
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152 }
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153
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154 /* Try the easy cases first */
955
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155 if ( timeout == 0 ) {
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156 return SDL_SemTryWait(sem);
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157 }
1099
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158 if ( timeout == SDL_MUTEX_MAXWAIT ) {
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159 return SDL_SemWait(sem);
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160 }
955
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161
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162 /* Ack! We have to busy wait... */
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163 timeout += SDL_GetTicks();
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164 do {
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165 retval = SDL_SemTryWait(sem);
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166 if ( retval == 0 ) {
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167 break;
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168 }
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169 SDL_Delay(1);
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170 } while ( SDL_GetTicks() < timeout );
955
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171
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172 return retval;
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173 }
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174
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175 Uint32 SDL_SemValue(SDL_sem *sem)
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176 {
1099
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177 int ret = 0;
955
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178 if ( sem ) {
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179 sem_getvalue(sem->sem, &ret);
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180 if ( ret < 0 ) {
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181 ret = 0;
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182 }
955
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183 }
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184 return (Uint32)ret;
955
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185 }
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parents:
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186
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187 int SDL_SemPost(SDL_sem *sem)
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188 {
1099
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189 int retval;
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190
955
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191 if ( ! sem ) {
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192 SDL_SetError("Passed a NULL semaphore");
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193 return -1;
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194 }
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195
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196 retval = sem_post(sem->sem);
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197 if ( retval < 0 ) {
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198 SDL_SetError("sem_post() failed");
955
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199 }
1099
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200 return retval;
955
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201 }
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
Sam Lantinga <slouken@libsdl.org>
parents:
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202
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents: 1358
diff changeset
203 #endif /* !SDL_THREADS_DISABLED */