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annotate src/thread/pthread/SDL_syssem.c @ 1588:e20dcef5647c

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Improved DirectFB install detection
author Sam Lantinga <slouken@libsdl.org>
date Wed, 22 Mar 2006 09:18:10 +0000
parents dc6b59e925a2
children aee7ea396f59
rev   line source
1361
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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 #define USE_NAMED_SEMAPHORES 1
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34 #include <unistd.h>
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35 #endif
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36
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37 struct SDL_semaphore {
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38 sem_t *sem;
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39 #if !USE_NAMED_SEMAPHORES
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40 sem_t sem_data;
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41 #endif
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42 };
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43
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44 /* Create a semaphore, initialized with value */
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45 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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46 {
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47 SDL_sem *sem = (SDL_sem *) SDL_malloc(sizeof(SDL_sem));
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48 if ( sem ) {
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49 #if USE_NAMED_SEMAPHORES
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50 static int semnum = 0;
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51 char name[32];
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52
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53 SDL_snprintf(name, SDL_arraysize(name), "/SDL_sem-%d-%4.4d", getpid(), semnum++);
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54 sem->sem = sem_open(name, O_CREAT, 0600, initial_value);
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55 if ( sem->sem == (sem_t *)SEM_FAILED ) {
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56 SDL_SetError("sem_open(%s) failed", name);
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57 SDL_free(sem);
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58 sem = NULL;
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59 } else {
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60 sem_unlink(name);
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61 }
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62 #else
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63 if ( sem_init(&sem->sem_data, 0, initial_value) < 0 ) {
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64 SDL_SetError("sem_init() failed");
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65 SDL_free(sem);
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66 sem = NULL;
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67 } else {
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68 sem->sem = &sem->sem_data;
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69 }
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70 #endif /* USE_NAMED_SEMAPHORES */
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71 } else {
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72 SDL_OutOfMemory();
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73 }
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74 return sem;
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75 }
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76
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77 void SDL_DestroySemaphore(SDL_sem *sem)
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78 {
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79 if ( sem ) {
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80 #if USE_NAMED_SEMAPHORES
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81 sem_close(sem->sem);
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82 #else
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83 sem_destroy(sem->sem);
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84 #endif
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85 SDL_free(sem);
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86 }
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87 }
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88
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89 int SDL_SemTryWait(SDL_sem *sem)
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90 {
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91 int retval;
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92
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93 if ( ! sem ) {
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94 SDL_SetError("Passed a NULL semaphore");
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95 return -1;
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96 }
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97 retval = SDL_MUTEX_TIMEDOUT;
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98 if ( sem_trywait(sem->sem) == 0 ) {
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99 retval = 0;
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100 }
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101 return retval;
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102 }
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103
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104 int SDL_SemWait(SDL_sem *sem)
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105 {
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106 int retval;
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107
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108 if ( ! sem ) {
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109 SDL_SetError("Passed a NULL semaphore");
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110 return -1;
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111 }
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112
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113 retval = sem_wait(sem->sem);
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114 if ( retval < 0 ) {
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115 SDL_SetError("sem_wait() failed");
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116 }
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117 return retval;
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118 }
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119
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120 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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121 {
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122 int retval;
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123
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124 if ( ! sem ) {
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125 SDL_SetError("Passed a NULL semaphore");
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126 return -1;
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127 }
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128
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129 /* Try the easy cases first */
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130 if ( timeout == 0 ) {
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131 return SDL_SemTryWait(sem);
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132 }
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133 if ( timeout == SDL_MUTEX_MAXWAIT ) {
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134 return SDL_SemWait(sem);
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135 }
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136
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137 /* Ack! We have to busy wait... */
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138 timeout += SDL_GetTicks();
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139 do {
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140 retval = SDL_SemTryWait(sem);
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141 if ( retval == 0 ) {
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142 break;
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143 }
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144 SDL_Delay(1);
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145 } while ( SDL_GetTicks() < timeout );
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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 Uint32 SDL_SemValue(SDL_sem *sem)
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151 {
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152 int ret = 0;
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153 if ( sem ) {
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154 sem_getvalue(sem->sem, &ret);
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155 if ( ret < 0 ) {
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156 ret = 0;
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157 }
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158 }
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159 return (Uint32)ret;
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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 int retval;
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165
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166 if ( ! sem ) {
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167 SDL_SetError("Passed a NULL semaphore");
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168 return -1;
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169 }
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170
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171 retval = sem_post(sem->sem);
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172 if ( retval < 0 ) {
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173 SDL_SetError("sem_post() failed");
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174 }
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175 return retval;
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176 }