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annotate src/thread/pthread/SDL_syssem.c @ 2185:2032348afed1

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This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is available and to keep people form having to install yet another library I have added the essential parts of Xmu in src/video/extensions/XmuStdCmap and an include file in src/video/extensions. The support makes use of standard X11 mechanisms to create color maps and make sure that an application uses the same color map for each window/visual combination. This should make it possible for gamma support to be implemented based on a single color map per application. Hurm... it looks like "make indent" modified a few extra files. Those are getting committed too.
author Bob Pendleton <bob@pendleton.com>
date Thu, 12 Jul 2007 20:00:50 +0000
parents c121d94672cb
children 375f9132da7f e27bdcc80744
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 #include <pthread.h>
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25 #include <semaphore.h>
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26
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27 #include "SDL_thread.h"
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28 #include "SDL_timer.h"
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29
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30 /* Wrapper around POSIX 1003.1b semaphores */
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31
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32 #ifdef __MACOSX__
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33 /* Mac OS X doesn't support sem_getvalue() as of version 10.4 */
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34 #include "../generic/SDL_syssem.c"
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35 #else
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36
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37 struct SDL_semaphore
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38 {
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39 sem_t sem;
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40 };
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41
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42 /* Create a semaphore, initialized with value */
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43 SDL_sem *
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44 SDL_CreateSemaphore(Uint32 initial_value)
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45 {
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46 SDL_sem *sem = (SDL_sem *) SDL_malloc(sizeof(SDL_sem));
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47 if (sem) {
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48 if (sem_init(&sem->sem, 0, initial_value) < 0) {
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49 SDL_SetError("sem_init() failed");
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50 SDL_free(sem);
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51 sem = NULL;
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52 }
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53 } else {
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54 SDL_OutOfMemory();
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55 }
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56 return sem;
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57 }
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58
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59 void
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60 SDL_DestroySemaphore(SDL_sem * sem)
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61 {
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62 if (sem) {
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63 sem_destroy(&sem->sem);
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64 SDL_free(sem);
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65 }
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66 }
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67
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68 int
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69 SDL_SemTryWait(SDL_sem * sem)
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70 {
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71 int retval;
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72
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73 if (!sem) {
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74 SDL_SetError("Passed a NULL semaphore");
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75 return -1;
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76 }
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77 retval = SDL_MUTEX_TIMEDOUT;
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78 if (sem_trywait(&sem->sem) == 0) {
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79 retval = 0;
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80 }
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81 return retval;
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82 }
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83
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84 int
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85 SDL_SemWait(SDL_sem * sem)
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86 {
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87 int retval;
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88
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89 if (!sem) {
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90 SDL_SetError("Passed a NULL semaphore");
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91 return -1;
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92 }
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93
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94 retval = sem_wait(&sem->sem);
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95 if (retval < 0) {
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96 SDL_SetError("sem_wait() failed");
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97 }
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98 return retval;
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99 }
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100
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101 int
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102 SDL_SemWaitTimeout(SDL_sem * sem, Uint32 timeout)
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103 {
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104 int retval;
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105
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106 if (!sem) {
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107 SDL_SetError("Passed a NULL semaphore");
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108 return -1;
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109 }
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110
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111 /* Try the easy cases first */
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112 if (timeout == 0) {
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113 return SDL_SemTryWait(sem);
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114 }
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115 if (timeout == SDL_MUTEX_MAXWAIT) {
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116 return SDL_SemWait(sem);
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117 }
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118
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119 /* Ack! We have to busy wait... */
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120 /* FIXME: Use sem_timedwait()? */
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121 timeout += SDL_GetTicks();
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122 do {
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123 retval = SDL_SemTryWait(sem);
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124 if (retval == 0) {
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125 break;
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126 }
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127 SDL_Delay(1);
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128 }
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129 while (SDL_GetTicks() < timeout);
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130
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131 return retval;
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132 }
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133
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134 Uint32
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135 SDL_SemValue(SDL_sem * sem)
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136 {
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137 int ret = 0;
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138 if (sem) {
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139 sem_getvalue(&sem->sem, &ret);
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140 if (ret < 0) {
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141 ret = 0;
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142 }
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143 }
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144 return (Uint32) ret;
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145 }
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146
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147 int
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148 SDL_SemPost(SDL_sem * sem)
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149 {
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150 int retval;
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151
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152 if (!sem) {
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153 SDL_SetError("Passed a NULL semaphore");
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154 return -1;
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155 }
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156
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157 retval = sem_post(&sem->sem);
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158 if (retval < 0) {
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159 SDL_SetError("sem_post() failed");
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160 }
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161 return retval;
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162 }
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163
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164 #endif /* __MACOSX__ */
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165 /* vi: set ts=4 sw=4 expandtab: */