author | Sam Lantinga <slouken@libsdl.org> |
Mon, 10 Jul 2006 21:04:37 +0000 | |
changeset 1895 | c121d94672cb |
parent 1851 | 536b0704b7d8 |
child 2343 | 375f9132da7f |
child 2669 | e27bdcc80744 |
permissions | -rw-r--r-- |
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/* |
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SDL - Simple DirectMedia Layer |
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3 |
Copyright (C) 1997-2006 Sam Lantinga |
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|
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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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|
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This library is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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Lesser General Public License for more details. |
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|
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You should have received a copy of the GNU Lesser General Public |
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License along with this library; if not, write to the Free Software |
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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|
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Sam Lantinga |
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slouken@libsdl.org |
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*/ |
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#include "SDL_config.h" |
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#include <pthread.h> |
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#include <semaphore.h> |
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#include "SDL_thread.h" |
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#include "SDL_timer.h" |
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/* Wrapper around POSIX 1003.1b semaphores */ |
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#ifdef __MACOSX__ |
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/* Mac OS X doesn't support sem_getvalue() as of version 10.4 */ |
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#include "../generic/SDL_syssem.c" |
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#else |
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struct SDL_semaphore |
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{ |
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sem_t sem; |
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}; |
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/* Create a semaphore, initialized with value */ |
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SDL_sem * |
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SDL_CreateSemaphore(Uint32 initial_value) |
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{ |
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SDL_sem *sem = (SDL_sem *) SDL_malloc(sizeof(SDL_sem)); |
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if (sem) { |
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if (sem_init(&sem->sem, 0, initial_value) < 0) { |
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SDL_SetError("sem_init() failed"); |
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SDL_free(sem); |
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sem = NULL; |
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} |
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} else { |
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SDL_OutOfMemory(); |
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} |
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return sem; |
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} |
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void |
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SDL_DestroySemaphore(SDL_sem * sem) |
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{ |
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if (sem) { |
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sem_destroy(&sem->sem); |
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SDL_free(sem); |
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} |
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} |
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int |
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SDL_SemTryWait(SDL_sem * sem) |
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{ |
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int retval; |
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if (!sem) { |
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SDL_SetError("Passed a NULL semaphore"); |
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return -1; |
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} |
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retval = SDL_MUTEX_TIMEDOUT; |
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if (sem_trywait(&sem->sem) == 0) { |
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retval = 0; |
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} |
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return retval; |
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} |
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int |
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SDL_SemWait(SDL_sem * sem) |
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{ |
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int retval; |
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if (!sem) { |
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SDL_SetError("Passed a NULL semaphore"); |
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return -1; |
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} |
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retval = sem_wait(&sem->sem); |
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if (retval < 0) { |
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SDL_SetError("sem_wait() failed"); |
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} |
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return retval; |
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} |
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int |
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SDL_SemWaitTimeout(SDL_sem * sem, Uint32 timeout) |
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{ |
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int retval; |
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if (!sem) { |
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SDL_SetError("Passed a NULL semaphore"); |
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return -1; |
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} |
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/* Try the easy cases first */ |
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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 |
} |
1627 | 163 |
|
164 |
#endif /* __MACOSX__ */ |
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165 |
/* vi: set ts=4 sw=4 expandtab: */ |