[sdl_omap.git] / src / thread / pthread / SDL_syscond.c

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2009 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;
}
Commit	Line	Data
e14743d1	1	/*
	2	SDL - Simple DirectMedia Layer
	3	Copyright (C) 1997-2009 Sam Lantinga
	4
	5	This library is free software; you can redistribute it and/or
	6	modify it under the terms of the GNU Lesser General Public
	7	License as published by the Free Software Foundation; either
	8	version 2.1 of the License, or (at your option) any later version.
	9
	10	This library is distributed in the hope that it will be useful,
	11	but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	Lesser General Public License for more details.
	14
	15	You should have received a copy of the GNU Lesser General Public
	16	License along with this library; if not, write to the Free Software
	17	Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	18
	19	Sam Lantinga
	20	slouken@libsdl.org
	21	*/
	22	#include "SDL_config.h"
	23
	24	#include <sys/time.h>
	25	#include <unistd.h>
	26	#include <errno.h>
	27	#include <pthread.h>
	28
	29	#include "SDL_thread.h"
	30	#include "SDL_sysmutex_c.h"
	31
	32	struct SDL_cond
	33	{
	34	pthread_cond_t cond;
	35	};
	36
	37	/* Create a condition variable */
	38	SDL_cond * SDL_CreateCond(void)
	39	{
	40	SDL_cond *cond;
	41
	42	cond = (SDL_cond *) SDL_malloc(sizeof(SDL_cond));
	43	if ( cond ) {
	44	if ( pthread_cond_init(&cond->cond, NULL) < 0 ) {
	45	SDL_SetError("pthread_cond_init() failed");
	46	SDL_free(cond);
	47	cond = NULL;
	48	}
	49	}
	50	return(cond);
	51	}
	52
	53	/* Destroy a condition variable */
	54	void SDL_DestroyCond(SDL_cond *cond)
	55	{
	56	if ( cond ) {
	57	pthread_cond_destroy(&cond->cond);
	58	SDL_free(cond);
	59	}
	60	}
	61
	62	/* Restart one of the threads that are waiting on the condition variable */
	63	int SDL_CondSignal(SDL_cond *cond)
	64	{
65	int retval;
66
67	if ( ! cond ) {
68	SDL_SetError("Passed a NULL condition variable");
69	return -1;
70	}
71
72	retval = 0;
73	if ( pthread_cond_signal(&cond->cond) != 0 ) {
74	SDL_SetError("pthread_cond_signal() failed");
75	retval = -1;
76	}
77	return retval;
78	}
79
80	/* Restart all threads that are waiting on the condition variable */
81	int SDL_CondBroadcast(SDL_cond *cond)
82	{
83	int retval;
84
85	if ( ! cond ) {
86	SDL_SetError("Passed a NULL condition variable");
87	return -1;
88	}
89
90	retval = 0;
91	if ( pthread_cond_broadcast(&cond->cond) != 0 ) {
92	SDL_SetError("pthread_cond_broadcast() failed");
93	retval = -1;
94	}
95	return retval;
96	}
97
98	int SDL_CondWaitTimeout(SDL_cond cond, SDL_mutex mutex, Uint32 ms)
99	{
100	int retval;
101	struct timeval delta;
102	struct timespec abstime;
103
104	if ( ! cond ) {
105	SDL_SetError("Passed a NULL condition variable");
106	return -1;
107	}
108
109	gettimeofday(&delta, NULL);
110
111	abstime.tv_sec = delta.tv_sec + (ms/1000);
112	abstime.tv_nsec = (delta.tv_usec + (ms%1000) * 1000) * 1000;
113	if ( abstime.tv_nsec > 1000000000 ) {
114	abstime.tv_sec += 1;
115	abstime.tv_nsec -= 1000000000;
116	}
117
118	tryagain:
119	retval = pthread_cond_timedwait(&cond->cond, &mutex->id, &abstime);
120	switch (retval) {
121	case EINTR:
122	goto tryagain;
123	break;
124	case ETIMEDOUT:
125	retval = SDL_MUTEX_TIMEDOUT;
126	break;
127	case 0:
128	break;
129	default:
130	SDL_SetError("pthread_cond_timedwait() failed");
131	retval = -1;
132	break;
133	}
134	return retval;
135	}
136
137	/* Wait on the condition variable, unlocking the provided mutex.
138	The mutex must be locked before entering this function!
139	*/
140	int SDL_CondWait(SDL_cond cond, SDL_mutex mutex)
141	{
142	int retval;
143
144	if ( ! cond ) {
145	SDL_SetError("Passed a NULL condition variable");
146	return -1;
147	}
148
149	retval = 0;
150	if ( pthread_cond_wait(&cond->cond, &mutex->id) != 0 ) {
151	SDL_SetError("pthread_cond_wait() failed");
152	retval = -1;
153	}
154	return retval;
155	}