src/thread/riscos/SDL_syscond.c
author Sam Lantinga <slouken@libsdl.org>
Thu, 16 Feb 2006 10:11:48 +0000
changeset 1361 19418e4422cb
parent 1358 c71e05b4dc2e
child 1402 d910939febfa
permissions -rw-r--r--
New configure-based build system. Still work in progress, but much improved
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2006 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 Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 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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    Lesser General Public License for more details.
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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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    Sam Lantinga
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    slouken@libsdl.org
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*/
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/* RISC OS implementations uses pthreads based on linux code */
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#if SDL_THREADS_DISABLED
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#include "../generic/SDL_syscond.c"
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#else
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#include <sys/time.h>
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#include <unistd.h>
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#include <pthread.h>
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#include "SDL_thread.h"
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#include "SDL_sysmutex_c.h"
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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 *) SDL_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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			SDL_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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		SDL_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) * 1000;
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        if ( abstime.tv_nsec > 1000000000 ) {
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          abstime.tv_sec += 1;
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          abstime.tv_nsec -= 1000000000;
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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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   130
	    case 0:
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   131
		break;
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   132
	    default:
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   133
		SDL_SetError("pthread_cond_timedwait() failed");
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   134
		retval = -1;
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   135
		break;
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   136
	}
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   137
	return retval;
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   138
}
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   139
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   140
/* Wait on the condition variable, unlocking the provided mutex.
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   141
   The mutex must be locked before entering this function!
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   142
 */
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   143
int SDL_CondWait(SDL_cond *cond, SDL_mutex *mutex)
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   144
{
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   145
	int retval;
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   146
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   147
	if ( ! cond ) {
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   148
		SDL_SetError("Passed a NULL condition variable");
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		return -1;
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   150
	}
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   151
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   152
	retval = 0;
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   153
	if ( pthread_cond_wait(&cond->cond, &mutex->id) != 0 ) {
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   154
		SDL_SetError("pthread_cond_wait() failed");
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   155
		retval = -1;
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   156
	}
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   157
	return retval;
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   158
}
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   159
#endif