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189
src/thread/linux/SDL_syscond.c
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189
src/thread/linux/SDL_syscond.c
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/*
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SDL - Simple DirectMedia Layer
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Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Sam Lantinga
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slouken@devolution.com
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*/
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#ifdef SAVE_RCSID
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static char rcsid =
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"@(#) $Id$";
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#endif
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#ifdef linux
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/* Look to see if glibc is available, and if so, what version */
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#include <features.h>
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#if (__GLIBC__ == 2) && (__GLIBC_MINOR__ == 0)
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#warning Working around a bug in glibc 2.0 pthreads
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#undef SDL_USE_PTHREADS
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/* The bug is actually a problem where threads are suspended, but don't
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wake up when the thread manager sends them a signal. This is a problem
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with thread creation too, but it happens less often. :-/
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We avoid this by using System V IPC for mutexes.
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*/
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#endif /* glibc 2.0 */
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#endif /* linux */
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#ifdef SDL_USE_PTHREADS
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#include <sys/time.h>
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#include <unistd.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <pthread.h>
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#include "SDL_error.h"
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#include "SDL_thread.h"
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#include "SDL_sysmutex_c.h"
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#if defined(PTHREAD_NO_RECURSIVE_MUTEX) && !defined(__bsdi__)
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#error You need to use the generic condition variable implementation
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#endif
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struct SDL_cond
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{
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pthread_cond_t cond;
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};
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/* Create a condition variable */
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SDL_cond * SDL_CreateCond(void)
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{
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SDL_cond *cond;
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cond = (SDL_cond *) malloc(sizeof(SDL_cond));
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if ( cond ) {
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if ( pthread_cond_init(&cond->cond, NULL) < 0 ) {
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SDL_SetError("pthread_cond_init() failed");
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free(cond);
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cond = NULL;
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}
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}
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return(cond);
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}
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/* Destroy a condition variable */
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void SDL_DestroyCond(SDL_cond *cond)
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{
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if ( cond ) {
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pthread_cond_destroy(&cond->cond);
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free(cond);
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}
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}
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/* Restart one of the threads that are waiting on the condition variable */
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int SDL_CondSignal(SDL_cond *cond)
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{
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int retval;
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if ( ! cond ) {
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SDL_SetError("Passed a NULL condition variable");
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return -1;
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}
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retval = 0;
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if ( pthread_cond_signal(&cond->cond) != 0 ) {
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SDL_SetError("pthread_cond_signal() failed");
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retval = -1;
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}
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return retval;
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}
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/* Restart all threads that are waiting on the condition variable */
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int SDL_CondBroadcast(SDL_cond *cond)
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{
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int retval;
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if ( ! cond ) {
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SDL_SetError("Passed a NULL condition variable");
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return -1;
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}
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retval = 0;
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if ( pthread_cond_broadcast(&cond->cond) != 0 ) {
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SDL_SetError("pthread_cond_broadcast() failed");
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retval = -1;
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}
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return retval;
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}
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int SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms)
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{
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int retval;
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struct timeval delta;
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struct timespec abstime;
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if ( ! cond ) {
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SDL_SetError("Passed a NULL condition variable");
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return -1;
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}
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gettimeofday(&delta, NULL);
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abstime.tv_sec = delta.tv_sec + (ms/1000);
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abstime.tv_nsec = (delta.tv_usec+(ms%1000)) * 1000;
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if ( abstime.tv_nsec > 1000000 ) {
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abstime.tv_sec += 1;
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abstime.tv_nsec -= 1000000;
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}
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tryagain:
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retval = pthread_cond_timedwait(&cond->cond, &mutex->id, &abstime);
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switch (retval) {
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case EINTR:
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goto tryagain;
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break;
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case ETIMEDOUT:
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retval = SDL_MUTEX_TIMEDOUT;
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break;
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case 0:
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break;
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default:
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SDL_SetError("pthread_cond_timedwait() failed");
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retval = -1;
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break;
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}
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return retval;
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}
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/* Wait on the condition variable, unlocking the provided mutex.
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The mutex must be locked before entering this function!
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*/
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int SDL_CondWait(SDL_cond *cond, SDL_mutex *mutex)
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{
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int retval;
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if ( ! cond ) {
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SDL_SetError("Passed a NULL condition variable");
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return -1;
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}
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retval = 0;
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if ( pthread_cond_wait(&cond->cond, &mutex->id) != 0 ) {
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SDL_SetError("pthread_cond_wait() failed");
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retval = -1;
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}
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return retval;
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}
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#else /* Use semaphore implementation */
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#include "generic/SDL_syscond.c"
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#endif /* SDL_USE_PTHREADS */
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