[sdl_omap.git] / src / thread / riscos / 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"

/* RISC OS implementations uses pthreads based on linux code */

#if SDL_THREADS_DISABLED
#include "../generic/SDL_syscond.c"
#else
#include <sys/time.h>
#include <unistd.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;
}
#endif
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	/* RISC OS implementations uses pthreads based on linux code */
	25
	26	#if SDL_THREADS_DISABLED
	27	#include "../generic/SDL_syscond.c"
	28	#else
	29	#include <sys/time.h>
	30	#include <unistd.h>
	31	#include <pthread.h>
	32
	33	#include "SDL_thread.h"
	34	#include "SDL_sysmutex_c.h"
	35
	36	struct SDL_cond
	37	{
	38	pthread_cond_t cond;
	39	};
	40
	41	/* Create a condition variable */
	42	SDL_cond * SDL_CreateCond(void)
	43	{
	44	SDL_cond *cond;
	45
	46	cond = (SDL_cond *) SDL_malloc(sizeof(SDL_cond));
	47	if ( cond ) {
	48	if ( pthread_cond_init(&cond->cond, NULL) < 0 ) {
	49	SDL_SetError("pthread_cond_init() failed");
	50	SDL_free(cond);
	51	cond = NULL;
	52	}
	53	}
	54	return(cond);
	55	}
	56
	57	/* Destroy a condition variable */
	58	void SDL_DestroyCond(SDL_cond *cond)
	59	{
	60	if ( cond ) {
	61	pthread_cond_destroy(&cond->cond);
	62	SDL_free(cond);
	63	}
	64	}
65
66	/* Restart one of the threads that are waiting on the condition variable */
67	int SDL_CondSignal(SDL_cond *cond)
68	{
69	int retval;
70
71	if ( ! cond ) {
72	SDL_SetError("Passed a NULL condition variable");
73	return -1;
74	}
75
76	retval = 0;
77	if ( pthread_cond_signal(&cond->cond) != 0 ) {
78	SDL_SetError("pthread_cond_signal() failed");
79	retval = -1;
80	}
81	return retval;
82	}
83
84	/* Restart all threads that are waiting on the condition variable */
85	int SDL_CondBroadcast(SDL_cond *cond)
86	{
87	int retval;
88
89	if ( ! cond ) {
90	SDL_SetError("Passed a NULL condition variable");
91	return -1;
92	}
93
94	retval = 0;
95	if ( pthread_cond_broadcast(&cond->cond) != 0 ) {
96	SDL_SetError("pthread_cond_broadcast() failed");
97	retval = -1;
98	}
99	return retval;
100	}
101
102	int SDL_CondWaitTimeout(SDL_cond cond, SDL_mutex mutex, Uint32 ms)
103	{
104	int retval;
105	struct timeval delta;
106	struct timespec abstime;
107
108	if ( ! cond ) {
109	SDL_SetError("Passed a NULL condition variable");
110	return -1;
111	}
112
113	gettimeofday(&delta, NULL);
114
115	abstime.tv_sec = delta.tv_sec + (ms/1000);
116	abstime.tv_nsec = (delta.tv_usec + (ms%1000) * 1000) * 1000;
117	if ( abstime.tv_nsec > 1000000000 ) {
118	abstime.tv_sec += 1;
119	abstime.tv_nsec -= 1000000000;
120	}
121
122	tryagain:
123	retval = pthread_cond_timedwait(&cond->cond, &mutex->id, &abstime);
124	switch (retval) {
125	case EINTR:
126	goto tryagain;
127	break;
128	case ETIMEDOUT:
129	retval = SDL_MUTEX_TIMEDOUT;
130	break;
131	case 0:
132	break;
133	default:
134	SDL_SetError("pthread_cond_timedwait() failed");
135	retval = -1;
136	break;
137	}
138	return retval;
139	}
140
141	/* Wait on the condition variable, unlocking the provided mutex.
142	The mutex must be locked before entering this function!
143	*/
144	int SDL_CondWait(SDL_cond cond, SDL_mutex mutex)
145	{
146	int retval;
147
148	if ( ! cond ) {
149	SDL_SetError("Passed a NULL condition variable");
150	return -1;
151	}
152
153	retval = 0;
154	if ( pthread_cond_wait(&cond->cond, &mutex->id) != 0 ) {
155	SDL_SetError("pthread_cond_wait() failed");
156	retval = -1;
157	}
158	return retval;
159	}
160	#endif