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/* -----------------------------------------------------------------------------
*
* (c) The GHC Team, 1995-2007
*
* Interval timer for profiling and pre-emptive scheduling.
*
* ---------------------------------------------------------------------------*/
#include "PosixSource.h"
#include "Rts.h"
#include "Ticker.h"
#include "Proftimer.h"
#include "Schedule.h"
#include "posix/Clock.h"
#include "posix/Signals.h"
#ifdef HAVE_SIGNAL_H
# include <signal.h>
#endif
#include <string.h>
static Time itimer_interval = DEFAULT_TICK_INTERVAL;
static timer_t timer;
void
initTicker (Time interval, TickProc handle_tick)
{
itimer_interval = interval;
struct sigevent ev;
// Keep programs like valgrind happy
memset(&ev, 0, sizeof(ev));
ev.sigev_notify = SIGEV_SIGNAL;
ev.sigev_signo = SIGVTALRM;
if (timer_create(CLOCK_ID, &ev, &timer) != 0) {
sysErrorBelch("timer_create");
stg_exit(EXIT_FAILURE);
}
install_vtalrm_handler(SIGVTALRM, handle_tick);
}
void
startTicker(void)
{
struct itimerspec it;
it.it_value.tv_sec = TimeToSeconds(itimer_interval);
it.it_value.tv_nsec = TimeToNS(itimer_interval) % 1000000000;
it.it_interval = it.it_value;
if (timer_settime(timer, 0, &it, NULL) != 0) {
sysErrorBelch("timer_settime");
stg_exit(EXIT_FAILURE);
}
}
void
stopTicker(void)
{
struct itimerspec it;
it.it_value.tv_sec = 0;
it.it_value.tv_nsec = 0;
it.it_interval = it.it_value;
if (timer_settime(timer, 0, &it, NULL) != 0) {
sysErrorBelch("timer_settime");
stg_exit(EXIT_FAILURE);
}
}
void
exitTicker (rtsBool wait STG_UNUSED)
{
// Before deleting the timer set the signal to ignore to avoid the
// possibility of the signal being delivered after the timer is deleted.
signal(SIGVTALRM, SIG_IGN);
timer_delete(timer);
// ignore errors - we don't really care if it fails.
}
int
rtsTimerSignal(void)
{
return SIGVTALRM;
}
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