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/*
* Copyright (C) 1996-1998 Szeredi Miklos
* Email: mszeredi@inf.bme.hu
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version. See the file COPYING.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include "config.h"
#include "sptiming.h"
#include "interf.h"
#ifndef USE_ALLEGRO
#include <sys/time.h>
#include <unistd.h>
#else
#include <allegro.h>
#endif
#ifndef USE_ALLEGRO /* UNIX specific timer routines */
static void add_tv(long usec, struct timeval *tv)
{
long us1;
us1 = tv->tv_usec + usec;
tv->tv_sec += us1 / 1000000;
tv->tv_usec = us1 % 1000000;
}
static long sub_tv(struct timeval *tv1, struct timeval *tv2)
{
return ((tv1->tv_sec - tv2->tv_sec) * 1000000 +
(tv1->tv_usec - tv2->tv_usec));
}
void spti_init(void)
{
}
void spti_sleep(unsigned long usecs)
{
struct timeval waittv;
waittv.tv_sec = 0;
waittv.tv_usec = usecs;
select(0, NULL, NULL, NULL, &waittv);
}
static struct timeval shouldbetv;
void spti_reset(void)
{
gettimeofday(&shouldbetv, NULL);
}
void spti_wait(void)
{
long rem;
struct timeval nowtv;
add_tv(SKIPTIME, &shouldbetv);
gettimeofday(&nowtv, NULL);
rem = sub_tv(&shouldbetv, &nowtv);
if(rem > 0) {
if(rem > SKIPTIME) rem = SKIPTIME;
spti_sleep((unsigned long) rem);
}
if(rem == SKIPTIME || rem < -10 * SKIPTIME) spti_reset();
}
#else /* Allegro specific timer routines */
typedef unsigned long sptime;
volatile sptime msecs;
sptime shouldbems;
static void timer_handler(void)
{
msecs++;
}
END_OF_FUNCTION(timer_handler);
void spti_init(void)
{
if(install_timer() != NULL) {
put_msg("Cloud not initialize timer in allegro\n");
exit(1);
}
LOCK_VARIABLE(msecs);
LOCK_FUNCTION(timer_handler);
install_int(timer_handler, 1);
msecs = 0;
}
void spti_sleep(unsigned long usecs)
{
rest(usecs / 1000);
}
void spti_reset(void)
{
shouldbems = msecs;
}
void spti_wait(void)
{
long rem;
shouldbems += (SKIPTIME / 1000);
rem = ((long) (shouldbems - msecs)) * 1000;
if(rem > 0) {
if(rem > SKIPTIME) rem = SKIPTIME;
spti_sleep(rem);
}
if(rem == SKIPTIME || rem < -10 * SKIPTIME) spti_reset();
}
#endif /* USE_ALLEGRO */
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