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annotate src/thread/riscos/SDL_syssem.c @ 1326:9439c2f1da89

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From: Hayashi Naoyuki I tried to compile with gcc on Tru64, and got the following error. SDL_systimer.c:45:45: error: operator '&&' has no right operand It succeeds if changing #if (defined _POSIX_TIMERS && _POSIX_TIMERS > 0) to #if (defined _POSIX_TIMERS && _POSIX_TIMERS + 0 > 0)
author Sam Lantinga <slouken@libsdl.org>
date Fri, 03 Feb 2006 07:43:42 +0000
parents c9b51268668f
children 3692456e7b0f
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 <stdlib.h>
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27
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28 #include "SDL_error.h"
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29 #include "SDL_timer.h"
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30 #include "SDL_thread.h"
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31
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32 #include "SDL_systhread_c.h"
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33
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34 #ifdef DISABLE_THREADS
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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 <stdio.h>
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80 #include <stdlib.h>
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81 #include <unistd.h> /* For getpid() */
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82 #include <pthread.h>
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83 #include <semaphore.h>
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84
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85 struct SDL_semaphore {
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86 sem_t *sem;
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87 sem_t sem_data;
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88 };
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89
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90 /* Create a semaphore, initialized with value */
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91 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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92 {
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93 SDL_sem *sem = (SDL_sem *) malloc(sizeof(SDL_sem));
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94 if ( sem ) {
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95 if ( sem_init(&sem->sem_data, 0, initial_value) < 0 ) {
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96 SDL_SetError("sem_init() failed");
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97 free(sem);
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98 sem = NULL;
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99 } else {
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100 sem->sem = &sem->sem_data;
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101 }
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102 } else {
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103 SDL_OutOfMemory();
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104 }
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105 return sem;
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106 }
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107
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108 void SDL_DestroySemaphore(SDL_sem *sem)
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109 {
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110 if ( sem ) {
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111 sem_destroy(sem->sem);
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112 free(sem);
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113 }
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114 }
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115
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116 int SDL_SemTryWait(SDL_sem *sem)
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117 {
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118 int retval;
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119
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120 if ( ! sem ) {
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121 SDL_SetError("Passed a NULL semaphore");
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122 return -1;
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123 }
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124 retval = SDL_MUTEX_TIMEDOUT;
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125 if ( sem_trywait(sem->sem) == 0 ) {
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126 retval = 0;
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127 }
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128 return retval;
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129 }
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130
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131 int SDL_SemWait(SDL_sem *sem)
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132 {
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133 int retval;
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134
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135 if ( ! sem ) {
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136 SDL_SetError("Passed a NULL semaphore");
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137 return -1;
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138 }
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139
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140 retval = sem_wait(sem->sem);
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141 if ( retval < 0 ) {
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142 SDL_SetError("sem_wait() failed");
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143 }
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144 return retval;
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145 }
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146
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147 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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148 {
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149 int retval;
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150
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151 if ( ! sem ) {
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152 SDL_SetError("Passed a NULL semaphore");
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153 return -1;
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154 }
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155
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156 /* Try the easy cases first */
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157 if ( timeout == 0 ) {
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158 return SDL_SemTryWait(sem);
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159 }
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160 if ( timeout == SDL_MUTEX_MAXWAIT ) {
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161 return SDL_SemWait(sem);
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162 }
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163
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164 /* Ack! We have to busy wait... */
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165 timeout += SDL_GetTicks();
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166 do {
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167 retval = SDL_SemTryWait(sem);
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168 if ( retval == 0 ) {
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169 break;
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170 }
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171 SDL_Delay(1);
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172 } while ( SDL_GetTicks() < timeout );
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173
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174 return retval;
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175 }
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176
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177 Uint32 SDL_SemValue(SDL_sem *sem)
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178 {
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179 int ret = 0;
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180 if ( sem ) {
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181 sem_getvalue(sem->sem, &ret);
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182 if ( ret < 0 ) {
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183 ret = 0;
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184 }
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185 }
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186 return (Uint32)ret;
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187 }
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188
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189 int SDL_SemPost(SDL_sem *sem)
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190 {
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191 int retval;
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192
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193 if ( ! sem ) {
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194 SDL_SetError("Passed a NULL semaphore");
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195 return -1;
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196 }
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197
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198 retval = sem_post(sem->sem);
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199 if ( retval < 0 ) {
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200 SDL_SetError("sem_post() failed");
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201 }
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202 return retval;
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203 }
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204
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205 #endif /* DISABLE_THREADS */