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/**
* @file timer.c
* @date Wed Jun 23 09:41:26 2010
*
* @brief The timers which run the state machine.
*
* Timers in the PTP daemon are run off of the signal system.
*/
#include "../ptpd.h"
#define TIMER_INTERVAL 1
int elapsed;
void
catch_alarm(int sig)
{
elapsed += TIMER_INTERVAL;
DBGV("catch_alarm: elapsed %d\n", elapsed);
}
void
initTimer(void)
{
struct itimerval itimer;
DBG("initTimer\n");
signal(SIGALRM, SIG_IGN);
elapsed = 0;
itimer.it_value.tv_sec = itimer.it_interval.tv_sec = TIMER_INTERVAL;
itimer.it_value.tv_usec = itimer.it_interval.tv_usec = 0;
signal(SIGALRM, catch_alarm);
setitimer(ITIMER_REAL, &itimer, 0);
}
void
timerUpdate(IntervalTimer * itimer)
{
int i, delta;
delta = elapsed;
elapsed = 0;
if (delta <= 0)
return;
for (i = 0; i < TIMER_ARRAY_SIZE; ++i) {
if (itimer[i].interval > 0 && (itimer[i].left -= delta) <= 0) {
itimer[i].left = itimer[i].interval;
itimer[i].expire = TRUE;
DBGV("timerUpdate: timer %u expired\n", i);
}
}
}
void
timerStop(UInteger16 index, IntervalTimer * itimer)
{
if (index >= TIMER_ARRAY_SIZE)
return;
itimer[index].interval = 0;
}
void
timerStart(UInteger16 index, UInteger16 interval, IntervalTimer * itimer)
{
if (index >= TIMER_ARRAY_SIZE)
return;
itimer[index].expire = FALSE;
itimer[index].left = interval;
itimer[index].interval = itimer[index].left;
DBGV("timerStart: set timer %d to %d\n", index, interval);
}
Boolean
timerExpired(UInteger16 index, IntervalTimer * itimer)
{
timerUpdate(itimer);
if (index >= TIMER_ARRAY_SIZE)
return FALSE;
if (!itimer[index].expire)
return FALSE;
itimer[index].expire = FALSE;
return TRUE;
}
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