diff options
Diffstat (limited to 'distrib/sdl-1.2.15/src/thread/pthread/SDL_syscond.c')
| -rw-r--r-- | distrib/sdl-1.2.15/src/thread/pthread/SDL_syscond.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/distrib/sdl-1.2.15/src/thread/pthread/SDL_syscond.c b/distrib/sdl-1.2.15/src/thread/pthread/SDL_syscond.c new file mode 100644 index 0000000..15bce96 --- /dev/null +++ b/distrib/sdl-1.2.15/src/thread/pthread/SDL_syscond.c @@ -0,0 +1,155 @@ +/* + SDL - Simple DirectMedia Layer + Copyright (C) 1997-2012 Sam Lantinga + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + This library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + + Sam Lantinga + slouken@libsdl.org +*/ +#include "SDL_config.h" + +#include <sys/time.h> +#include <unistd.h> +#include <errno.h> +#include <pthread.h> + +#include "SDL_thread.h" +#include "SDL_sysmutex_c.h" + +struct SDL_cond +{ + pthread_cond_t cond; +}; + +/* Create a condition variable */ +SDL_cond * SDL_CreateCond(void) +{ + SDL_cond *cond; + + cond = (SDL_cond *) SDL_malloc(sizeof(SDL_cond)); + if ( cond ) { + if ( pthread_cond_init(&cond->cond, NULL) < 0 ) { + SDL_SetError("pthread_cond_init() failed"); + SDL_free(cond); + cond = NULL; + } + } + return(cond); +} + +/* Destroy a condition variable */ +void SDL_DestroyCond(SDL_cond *cond) +{ + if ( cond ) { + pthread_cond_destroy(&cond->cond); + SDL_free(cond); + } +} + +/* Restart one of the threads that are waiting on the condition variable */ +int SDL_CondSignal(SDL_cond *cond) +{ + int retval; + + if ( ! cond ) { + SDL_SetError("Passed a NULL condition variable"); + return -1; + } + + retval = 0; + if ( pthread_cond_signal(&cond->cond) != 0 ) { + SDL_SetError("pthread_cond_signal() failed"); + retval = -1; + } + return retval; +} + +/* Restart all threads that are waiting on the condition variable */ +int SDL_CondBroadcast(SDL_cond *cond) +{ + int retval; + + if ( ! cond ) { + SDL_SetError("Passed a NULL condition variable"); + return -1; + } + + retval = 0; + if ( pthread_cond_broadcast(&cond->cond) != 0 ) { + SDL_SetError("pthread_cond_broadcast() failed"); + retval = -1; + } + return retval; +} + +int SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms) +{ + int retval; + struct timeval delta; + struct timespec abstime; + + if ( ! cond ) { + SDL_SetError("Passed a NULL condition variable"); + return -1; + } + + gettimeofday(&delta, NULL); + + abstime.tv_sec = delta.tv_sec + (ms/1000); + abstime.tv_nsec = (delta.tv_usec + (ms%1000) * 1000) * 1000; + if ( abstime.tv_nsec > 1000000000 ) { + abstime.tv_sec += 1; + abstime.tv_nsec -= 1000000000; + } + + tryagain: + retval = pthread_cond_timedwait(&cond->cond, &mutex->id, &abstime); + switch (retval) { + case EINTR: + goto tryagain; + break; + case ETIMEDOUT: + retval = SDL_MUTEX_TIMEDOUT; + break; + case 0: + break; + default: + SDL_SetError("pthread_cond_timedwait() failed"); + retval = -1; + break; + } + return retval; +} + +/* Wait on the condition variable, unlocking the provided mutex. + The mutex must be locked before entering this function! + */ +int SDL_CondWait(SDL_cond *cond, SDL_mutex *mutex) +{ + int retval; + + if ( ! cond ) { + SDL_SetError("Passed a NULL condition variable"); + return -1; + } + + retval = 0; + if ( pthread_cond_wait(&cond->cond, &mutex->id) != 0 ) { + SDL_SetError("pthread_cond_wait() failed"); + retval = -1; + } + return retval; +} |