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annotate src/thread/riscos/SDL_syssem.c @ 1361:19418e4422cb

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New configure-based build system. Still work in progress, but much improved
author Sam Lantinga <slouken@libsdl.org>
date Thu, 16 Feb 2006 10:11:48 +0000
parents c71e05b4dc2e
children d910939febfa
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_timer.h"
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27 #include "SDL_thread.h"
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28 #include "SDL_systhread_c.h"
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29
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30 #if !SDL_THREADS_DISABLED
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31
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32 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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33 {
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34 SDL_SetError("SDL not configured with thread support");
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35 return (SDL_sem *)0;
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36 }
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37
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38 void SDL_DestroySemaphore(SDL_sem *sem)
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39 {
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40 return;
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41 }
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42
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43 int SDL_SemTryWait(SDL_sem *sem)
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44 {
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45 SDL_SetError("SDL not configured with thread support");
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46 return -1;
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47 }
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48
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49 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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50 {
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51 SDL_SetError("SDL not configured with thread support");
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52 return -1;
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53 }
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54
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55 int SDL_SemWait(SDL_sem *sem)
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56 {
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57 SDL_SetError("SDL not configured with thread support");
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58 return -1;
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59 }
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60
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61 Uint32 SDL_SemValue(SDL_sem *sem)
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62 {
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63 return 0;
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64 }
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65
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66 int SDL_SemPost(SDL_sem *sem)
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67 {
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68 SDL_SetError("SDL not configured with thread support");
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69 return -1;
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70 }
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71
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72 #else
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73
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74
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75 #include <unistd.h> /* For getpid() */
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76 #include <pthread.h>
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77 #include <semaphore.h>
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78
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79 struct SDL_semaphore {
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80 sem_t *sem;
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81 sem_t sem_data;
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82 };
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83
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84 /* Create a semaphore, initialized with value */
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85 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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86 {
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87 SDL_sem *sem = (SDL_sem *) SDL_malloc(sizeof(SDL_sem));
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88 if ( sem ) {
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89 if ( sem_init(&sem->sem_data, 0, initial_value) < 0 ) {
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90 SDL_SetError("sem_init() failed");
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91 SDL_free(sem);
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92 sem = NULL;
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93 } else {
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94 sem->sem = &sem->sem_data;
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95 }
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96 } else {
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97 SDL_OutOfMemory();
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98 }
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99 return sem;
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100 }
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101
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102 void SDL_DestroySemaphore(SDL_sem *sem)
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103 {
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104 if ( sem ) {
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105 sem_destroy(sem->sem);
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106 SDL_free(sem);
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107 }
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108 }
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109
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110 int SDL_SemTryWait(SDL_sem *sem)
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111 {
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112 int retval;
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113
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114 if ( ! sem ) {
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115 SDL_SetError("Passed a NULL semaphore");
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116 return -1;
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117 }
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118 retval = SDL_MUTEX_TIMEDOUT;
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119 if ( sem_trywait(sem->sem) == 0 ) {
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120 retval = 0;
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121 }
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122 return retval;
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123 }
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124
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125 int SDL_SemWait(SDL_sem *sem)
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126 {
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127 int retval;
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128
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129 if ( ! sem ) {
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130 SDL_SetError("Passed a NULL semaphore");
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131 return -1;
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132 }
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133
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134 retval = sem_wait(sem->sem);
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135 if ( retval < 0 ) {
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136 SDL_SetError("sem_wait() failed");
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137 }
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138 return retval;
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139 }
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140
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141 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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142 {
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143 int retval;
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144
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145 if ( ! sem ) {
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146 SDL_SetError("Passed a NULL semaphore");
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147 return -1;
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148 }
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149
1099
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150 /* Try the easy cases first */
955
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151 if ( timeout == 0 ) {
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152 return SDL_SemTryWait(sem);
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153 }
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154 if ( timeout == SDL_MUTEX_MAXWAIT ) {
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155 return SDL_SemWait(sem);
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156 }
955
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157
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158 /* Ack! We have to busy wait... */
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159 timeout += SDL_GetTicks();
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160 do {
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161 retval = SDL_SemTryWait(sem);
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162 if ( retval == 0 ) {
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163 break;
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164 }
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165 SDL_Delay(1);
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166 } while ( SDL_GetTicks() < timeout );
955
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167
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168 return retval;
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169 }
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170
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171 Uint32 SDL_SemValue(SDL_sem *sem)
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172 {
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173 int ret = 0;
955
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174 if ( sem ) {
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175 sem_getvalue(sem->sem, &ret);
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176 if ( ret < 0 ) {
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177 ret = 0;
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178 }
955
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179 }
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180 return (Uint32)ret;
955
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181 }
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182
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183 int SDL_SemPost(SDL_sem *sem)
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184 {
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185 int retval;
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186
955
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187 if ( ! sem ) {
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188 SDL_SetError("Passed a NULL semaphore");
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189 return -1;
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190 }
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191
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192 retval = sem_post(sem->sem);
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193 if ( retval < 0 ) {
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194 SDL_SetError("sem_post() failed");
955
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195 }
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196 return retval;
955
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197 }
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198
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
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199 #endif /* !SDL_THREADS_DISABLED */