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/*
* (C) 2006-2007 by Pablo Neira Ayuso <pablo@netfilter.org>
*
* 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.
*
* 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 <stdlib.h>
#include <assert.h>
#include <string.h>
#include "conntrackd.h"
#include "timer.h"
#define TIMESLICE_CREDIT (1000000 / STEPS_PER_SECONDS) /* 200 ms timeslice */
void timer_init(struct timer *timer)
{
memset(timer, 0, sizeof(struct timer));
timer->credits = TIMESLICE_CREDIT;
}
void timer_start(struct timer *timer)
{
gettimeofday(&timer->start, NULL);
}
static int timeval_subtract(struct timeval *diff,
struct timeval *start,
struct timeval *stop)
{
diff->tv_sec = stop->tv_sec - start->tv_sec;
diff->tv_usec = stop->tv_usec - start->tv_usec;
if (diff->tv_usec < 0) {
diff->tv_usec += 1000000;
diff->tv_sec--;
}
/* Return 1 if result is negative. */
return diff->tv_sec < 0;
}
void timer_stop(struct timer *timer)
{
gettimeofday(&timer->stop, NULL);
timeval_subtract(&timer->diff, &timer->start, &timer->stop);
}
int timer_adjust_credit(struct timer *timer)
{
if (timer->diff.tv_sec != 0) {
timer->credits = TIMESLICE_CREDIT;
return 1;
}
timer->credits -= timer->diff.tv_usec;
if (timer->credits < 0) {
timer->credits += TIMESLICE_CREDIT;
if (timer->credits < 0)
timer->credits = TIMESLICE_CREDIT;
return 1;
}
return 0;
}
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