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annotate src/thread/dc/SDL_syssem.c @ 3957:b1d5b56aa549 SDL-1.2

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Date: Mon, 4 Jun 2007 06:17:59 +0000 (UTC) From: George Gensure <werkt0@gmail.com> Subject: [SDL] error removal patch for SDL_x11dyn.c I found that calling SDL_GetError when an error hasn't necessarily occurred is still reporting problems from loadso regarding dynamic functions in X11. I've added the following to my local copy to avoid revealing the 'many library lookup' approach adopted by x11dyn.c:
author Ryan C. Gordon <icculus@icculus.org>
date Wed, 13 Jun 2007 07:54:10 +0000
parents 536b0704b7d8
children c121d94672cb a1b03ba2fcd0
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 #include <errno.h>
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24
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25 #include "SDL_config.h"
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26
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27 /* An implementation of semaphores using mutexes and condition variables */
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28
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29 #include "SDL_timer.h"
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30 #include "SDL_thread.h"
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31 #include "SDL_systhread_c.h"
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32
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33
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34 #if SDL_THREADS_DISABLED
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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 #include <kos/sem.h>
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79
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80 struct SDL_semaphore
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81 {
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82 semaphore_t sem;
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83 };
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84
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85 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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86 {
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87 return (SDL_sem *)sem_create(initial_value);
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88 }
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89
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90 /* WARNING:
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91 You cannot call this function when another thread is using the semaphore.
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92 */
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93 void SDL_DestroySemaphore(SDL_sem *sem)
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94 {
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95 if ( ! sem ) {
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96 SDL_SetError("Passed a NULL semaphore");
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97 return;
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98 }
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99
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100 sem_destroy(&sem->sem);
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101 }
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102
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103 int SDL_SemTryWait(SDL_sem *sem)
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104 {
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105 int retval;
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106
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107 if ( ! sem ) {
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108 SDL_SetError("Passed a NULL semaphore");
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109 return -1;
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110 }
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111
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112 retval = sem_trywait(&sem->sem);
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113 if (retval==0) return 0;
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114 else return SDL_MUTEX_TIMEDOUT;
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115
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116 return retval;
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117 }
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118
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119 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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120 {
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121 int retval;
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122
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123 if ( ! sem ) {
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124 SDL_SetError("Passed a NULL semaphore");
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125 return -1;
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126 }
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127
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128 /* A timeout of 0 is an easy case */
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129 if ( timeout == 0 ) {
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130 return SDL_SemTryWait(sem);
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131 }
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132
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133 retval = sem_wait_timed(&sem->sem,timeout);
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134 if (retval==-1) retval= SDL_MUTEX_TIMEDOUT;
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135
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136 return retval;
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137 }
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138
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139 int SDL_SemWait(SDL_sem *sem)
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140 {
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141 int retval;
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142
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143 if ( ! sem ) {
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144 SDL_SetError("Passed a NULL semaphore");
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145 return -1;
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146 }
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147
1851
536b0704b7d8 Make sure sem_wait didn't return early with EINTR. Fixes Bugzilla #231.
Ryan C. Gordon <icculus@icculus.org>
parents: 1402
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148 while ( ((retval = sem_wait(&sem->sem)) == -1) && (errno == EINTR) ) {}
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149 return retval;
509
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150 }
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151
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152 Uint32 SDL_SemValue(SDL_sem *sem)
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153 {
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154 if ( ! sem ) {
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155 SDL_SetError("Passed a NULL semaphore");
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156 return -1;
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157 }
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158
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159 return sem_count(&sem->sem);
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160 }
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161
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162 int SDL_SemPost(SDL_sem *sem)
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163 {
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164 if ( ! sem ) {
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165 SDL_SetError("Passed a NULL semaphore");
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166 return -1;
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167 }
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168
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169 sem_signal(&sem->sem);
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170 return 0;
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171 }
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172
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents: 1358
diff changeset
173 #endif /* SDL_THREADS_DISABLED */