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/*
* Copyright (c) 2000 Sasha Vasko <sasha at aftercode.net>
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include <unistd.h>
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
#include <sys/times.h>
#if defined ___AIX || defined _AIX || defined __QNX__ || defined ___AIXV3 || defined AIXV3 || defined _SEQUENT_
#include <sys/select.h>
#endif
#include "astypes.h"
#include "sleep.h"
/**************************************************************************
* Sleep for n microseconds
*************************************************************************/
void
sleep_a_little (int n)
{
struct timeval value;
if (n <= 0)
return;
value.tv_usec = n % 1000000;
value.tv_sec = n / 1000000;
PORTABLE_SELECT (1, 0, 0, 0, &value);
}
void
sleep_a_millisec (int n)
{
struct timeval value;
if (n <= 0)
return;
value.tv_usec = (n % 1000)*1000;
value.tv_sec = n / 1000;
PORTABLE_SELECT (1, 0, 0, 0, &value);
}
static clock_t _as_ticker_last_tick = 0;
static clock_t _as_ticker_tick_size = 1;
static clock_t _as_ticker_tick_time = 0;
void
start_ticker (unsigned int size)
{
struct tms t;
_as_ticker_last_tick = times (&t); /* in system ticks */
if (_as_ticker_tick_time == 0)
{
register clock_t delta = _as_ticker_last_tick;
/* calibrating clock - how many ms per cpu tick ? */
sleep_a_millisec (100);
_as_ticker_last_tick = times (&t);
delta = _as_ticker_last_tick - delta ;
if( delta <= 0 )
_as_ticker_tick_time = 100;
else if( delta <= 100 )
_as_ticker_tick_time = 101 / delta;
else
_as_ticker_tick_time = 1 ;
}
_as_ticker_tick_size = size; /* in ms */
}
void
wait_tick ()
{
struct tms t;
register clock_t curr = (times (&t) - _as_ticker_last_tick) * _as_ticker_tick_time;
if (curr < _as_ticker_tick_size)
sleep_a_millisec (_as_ticker_tick_size - curr);
_as_ticker_last_tick = times (&t);
}
int
is_tick ()
{
struct tms t;
register clock_t curr = (times (&t) - _as_ticker_last_tick) * _as_ticker_tick_time;
return (curr >= _as_ticker_tick_size) ;
}
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