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annotate src/thread/riscos/SDL_syssem.c @ 1338:604d73db6802

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Removed uses of stdlib.h and string.h
author Sam Lantinga <slouken@libsdl.org>
date Tue, 07 Feb 2006 09:29:18 +0000
parents 3692456e7b0f
children c71e05b4dc2e
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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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22
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23 /* RISC OS semiphores based on linux code */
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24
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25
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26 #include "SDL_stdlib.h"
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27 #include "SDL_error.h"
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28 #include "SDL_timer.h"
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29 #include "SDL_thread.h"
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30 #include "SDL_systhread_c.h"
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31
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32 #ifdef DISABLE_THREADS
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33
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34 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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35 {
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36 SDL_SetError("SDL not configured with thread support");
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37 return (SDL_sem *)0;
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38 }
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39
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40 void SDL_DestroySemaphore(SDL_sem *sem)
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41 {
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42 return;
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43 }
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44
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45 int SDL_SemTryWait(SDL_sem *sem)
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46 {
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47 SDL_SetError("SDL not configured with thread support");
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48 return -1;
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49 }
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50
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51 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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52 {
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53 SDL_SetError("SDL not configured with thread support");
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54 return -1;
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55 }
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56
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57 int SDL_SemWait(SDL_sem *sem)
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58 {
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59 SDL_SetError("SDL not configured with thread support");
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60 return -1;
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61 }
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62
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63 Uint32 SDL_SemValue(SDL_sem *sem)
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64 {
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65 return 0;
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66 }
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67
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68 int SDL_SemPost(SDL_sem *sem)
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69 {
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70 SDL_SetError("SDL not configured with thread support");
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71 return -1;
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72 }
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73
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74 #else
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75
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76
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77 #include <unistd.h> /* For getpid() */
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78 #include <pthread.h>
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79 #include <semaphore.h>
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80
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81 struct SDL_semaphore {
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82 sem_t *sem;
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83 sem_t sem_data;
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84 };
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85
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86 /* Create a semaphore, initialized with value */
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87 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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88 {
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89 SDL_sem *sem = (SDL_sem *) SDL_malloc(sizeof(SDL_sem));
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90 if ( sem ) {
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91 if ( sem_init(&sem->sem_data, 0, initial_value) < 0 ) {
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92 SDL_SetError("sem_init() failed");
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93 SDL_free(sem);
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94 sem = NULL;
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95 } else {
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96 sem->sem = &sem->sem_data;
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97 }
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98 } else {
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99 SDL_OutOfMemory();
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100 }
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101 return sem;
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102 }
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103
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104 void SDL_DestroySemaphore(SDL_sem *sem)
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105 {
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106 if ( sem ) {
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107 sem_destroy(sem->sem);
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108 SDL_free(sem);
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109 }
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110 }
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111
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112 int SDL_SemTryWait(SDL_sem *sem)
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113 {
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114 int retval;
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115
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116 if ( ! sem ) {
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117 SDL_SetError("Passed a NULL semaphore");
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118 return -1;
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119 }
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120 retval = SDL_MUTEX_TIMEDOUT;
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121 if ( sem_trywait(sem->sem) == 0 ) {
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122 retval = 0;
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123 }
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124 return retval;
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125 }
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126
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127 int SDL_SemWait(SDL_sem *sem)
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128 {
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129 int retval;
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130
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131 if ( ! sem ) {
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132 SDL_SetError("Passed a NULL semaphore");
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133 return -1;
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134 }
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135
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136 retval = sem_wait(sem->sem);
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137 if ( retval < 0 ) {
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138 SDL_SetError("sem_wait() failed");
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139 }
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140 return retval;
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141 }
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142
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143 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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144 {
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145 int retval;
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146
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147 if ( ! sem ) {
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148 SDL_SetError("Passed a NULL semaphore");
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149 return -1;
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150 }
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151
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152 /* Try the easy cases first */
955
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153 if ( timeout == 0 ) {
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154 return SDL_SemTryWait(sem);
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155 }
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156 if ( timeout == SDL_MUTEX_MAXWAIT ) {
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157 return SDL_SemWait(sem);
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158 }
955
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159
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160 /* Ack! We have to busy wait... */
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161 timeout += SDL_GetTicks();
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162 do {
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163 retval = SDL_SemTryWait(sem);
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164 if ( retval == 0 ) {
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165 break;
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166 }
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167 SDL_Delay(1);
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168 } while ( SDL_GetTicks() < timeout );
955
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169
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170 return retval;
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171 }
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172
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173 Uint32 SDL_SemValue(SDL_sem *sem)
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174 {
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175 int ret = 0;
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176 if ( sem ) {
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177 sem_getvalue(sem->sem, &ret);
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178 if ( ret < 0 ) {
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179 ret = 0;
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180 }
955
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181 }
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182 return (Uint32)ret;
955
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183 }
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184
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185 int SDL_SemPost(SDL_sem *sem)
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186 {
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187 int retval;
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188
955
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189 if ( ! sem ) {
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190 SDL_SetError("Passed a NULL semaphore");
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191 return -1;
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192 }
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193
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194 retval = sem_post(sem->sem);
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195 if ( retval < 0 ) {
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196 SDL_SetError("sem_post() failed");
955
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197 }
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198 return retval;
955
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199 }
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200
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201 #endif /* DISABLE_THREADS */