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annotate src/thread/riscos/SDL_syssem.c @ 4635:0a07d002f10b

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Fixed documentation error
author Sam Lantinga <slouken@libsdl.org>
date Sat, 14 Aug 2010 12:28:43 -0700
parents f7b03b6838cb
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) 1997-2010 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 #include "SDL_config.h"
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23
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24 /* RISC OS semiphores based on linux code */
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25
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26
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27 #include "SDL_timer.h"
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28 #include "SDL_thread.h"
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29 #include "SDL_systhread_c.h"
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30
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31 #if !SDL_THREADS_DISABLED
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32
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33 SDL_sem *
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34 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
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41 SDL_DestroySemaphore(SDL_sem * sem)
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42 {
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43 return;
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44 }
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45
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46 int
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47 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
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54 SDL_SemWaitTimeout(SDL_sem * sem, Uint32 timeout)
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55 {
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56 SDL_SetError("SDL not configured with thread support");
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57 return -1;
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58 }
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59
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60 int
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61 SDL_SemWait(SDL_sem * sem)
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62 {
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63 SDL_SetError("SDL not configured with thread support");
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64 return -1;
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65 }
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66
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67 Uint32
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68 SDL_SemValue(SDL_sem * sem)
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69 {
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70 return 0;
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71 }
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72
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73 int
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74 SDL_SemPost(SDL_sem * sem)
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75 {
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76 SDL_SetError("SDL not configured with thread support");
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77 return -1;
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78 }
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79
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80 #else
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81
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82
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83 #include <unistd.h> /* For getpid() */
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84 #include <pthread.h>
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85 #include <semaphore.h>
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86
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87 struct SDL_semaphore
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88 {
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89 sem_t *sem;
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90 sem_t sem_data;
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91 };
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92
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93 /* Create a semaphore, initialized with value */
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94 SDL_sem *
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95 SDL_CreateSemaphore(Uint32 initial_value)
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96 {
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97 SDL_sem *sem = (SDL_sem *) SDL_malloc(sizeof(SDL_sem));
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98 if (sem) {
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99 if (sem_init(&sem->sem_data, 0, initial_value) < 0) {
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100 SDL_SetError("sem_init() failed");
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101 SDL_free(sem);
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102 sem = NULL;
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103 } else {
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104 sem->sem = &sem->sem_data;
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105 }
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106 } else {
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107 SDL_OutOfMemory();
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108 }
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109 return sem;
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110 }
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111
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112 void
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113 SDL_DestroySemaphore(SDL_sem * sem)
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114 {
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115 if (sem) {
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116 sem_destroy(sem->sem);
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117 SDL_free(sem);
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118 }
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119 }
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120
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121 int
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122 SDL_SemTryWait(SDL_sem * sem)
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123 {
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124 int retval;
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125
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126 if (!sem) {
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127 SDL_SetError("Passed a NULL semaphore");
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128 return -1;
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129 }
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130 retval = SDL_MUTEX_TIMEDOUT;
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131 if (sem_trywait(sem->sem) == 0) {
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132 retval = 0;
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133 }
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134 return retval;
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135 }
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136
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137 int
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138 SDL_SemWait(SDL_sem * sem)
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139 {
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140 int retval;
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141
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142 if (!sem) {
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143 SDL_SetError("Passed a NULL semaphore");
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144 return -1;
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145 }
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146
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147 retval = sem_wait(sem->sem);
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148 if (retval < 0) {
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149 SDL_SetError("sem_wait() failed");
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150 }
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151 return retval;
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152 }
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153
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154 int
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155 SDL_SemWaitTimeout(SDL_sem * sem, Uint32 timeout)
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156 {
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157 int retval;
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158
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159 if (!sem) {
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160 SDL_SetError("Passed a NULL semaphore");
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161 return -1;
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162 }
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163
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164 /* Try the easy cases first */
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165 if (timeout == 0) {
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166 return SDL_SemTryWait(sem);
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167 }
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168 if (timeout == SDL_MUTEX_MAXWAIT) {
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169 return SDL_SemWait(sem);
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170 }
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171
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172 /* Ack! We have to busy wait... */
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173 timeout += SDL_GetTicks();
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174 do {
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175 retval = SDL_SemTryWait(sem);
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176 if (retval == 0) {
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177 break;
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178 }
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179 SDL_Delay(1);
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180 } while (SDL_GetTicks() < timeout);
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181
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182 return retval;
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183 }
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184
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185 Uint32
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186 SDL_SemValue(SDL_sem * sem)
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187 {
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188 int ret = 0;
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189 if (sem) {
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190 sem_getvalue(sem->sem, &ret);
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191 if (ret < 0) {
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192 ret = 0;
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193 }
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194 }
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195 return (Uint32) ret;
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196 }
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197
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198 int
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199 SDL_SemPost(SDL_sem * sem)
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200 {
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201 int retval;
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202
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203 if (!sem) {
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204 SDL_SetError("Passed a NULL semaphore");
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205 return -1;
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206 }
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207
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208 retval = sem_post(sem->sem);
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209 if (retval < 0) {
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210 SDL_SetError("sem_post() failed");
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211 }
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212 return retval;
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213 }
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214
1361
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215 #endif /* !SDL_THREADS_DISABLED */
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216 /* vi: set ts=4 sw=4 expandtab: */