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annotate src/thread/dc/SDL_syssem.c @ 2504:e68c99a19a2f gsoc2008_force_feedback

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Fixed more mistakes in documentation.
author Edgar Simo <bobbens@gmail.com>
date Mon, 07 Jul 2008 18:42:10 +0000
parents c121d94672cb
children 99210400e8b9
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 #include "SDL_config.h"
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23
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24 /* An implementation of semaphores using mutexes and condition variables */
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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
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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 #include <kos/sem.h>
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83
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84 struct SDL_semaphore
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85 {
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86 semaphore_t sem;
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87 };
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88
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89 SDL_sem *
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90 SDL_CreateSemaphore(Uint32 initial_value)
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91 {
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92 return (SDL_sem *) sem_create(initial_value);
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93 }
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94
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95 /* WARNING:
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96 You cannot call this function when another thread is using the semaphore.
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97 */
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98 void
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99 SDL_DestroySemaphore(SDL_sem * sem)
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100 {
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101 if (!sem) {
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102 SDL_SetError("Passed a NULL semaphore");
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103 return;
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104 }
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105
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106 sem_destroy(&sem->sem);
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107 }
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108
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109 int
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110 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
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119 retval = sem_trywait(&sem->sem);
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120 if (retval == 0)
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121 return 0;
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122 else
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123 return SDL_MUTEX_TIMEDOUT;
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124
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125 return retval;
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126 }
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127
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128 int
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129 SDL_SemWaitTimeout(SDL_sem * sem, Uint32 timeout)
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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
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138 /* A timeout of 0 is an easy case */
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139 if (timeout == 0) {
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140 return SDL_SemTryWait(sem);
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141 }
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142
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143 retval = sem_wait_timed(&sem->sem, timeout);
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144 if (retval == -1)
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145 retval = SDL_MUTEX_TIMEDOUT;
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146
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147 return retval;
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148 }
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149
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150 int
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151 SDL_SemWait(SDL_sem * sem)
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152 {
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153 if (!sem) {
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154 SDL_SetError("Passed a NULL semaphore");
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155 return -1;
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156 }
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157
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158 sem_wait(&sem->sem);
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159 return 0;
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160 }
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161
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162 Uint32
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163 SDL_SemValue(SDL_sem * sem)
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164 {
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165 if (!sem) {
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166 SDL_SetError("Passed a NULL semaphore");
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167 return -1;
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168 }
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169
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170 return sem_count(&sem->sem);
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171 }
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172
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173 int
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174 SDL_SemPost(SDL_sem * sem)
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175 {
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176 if (!sem) {
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177 SDL_SetError("Passed a NULL semaphore");
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178 return -1;
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179 }
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180
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181 sem_signal(&sem->sem);
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182 return 0;
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183 }
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184
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185 #endif /* SDL_THREADS_DISABLED */
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186 /* vi: set ts=4 sw=4 expandtab: */