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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"
/* As recommended in the autoconf manual */
# ifdef TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
# else
# ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
# endif
#ifdef HAVE_SIGNAL_H
# include <signal.h>
#endif
#include <string.h>
static Time itimer_interval = DEFAULT_TICK_INTERVAL;
void
initTicker (Time interval, TickProc handle_tick)
{
itimer_interval = interval;
install_vtalrm_handler(SIGALRM, handle_tick);
}
void
startTicker(void)
{
struct itimerval it;
it.it_value.tv_sec = TimeToSeconds(itimer_interval);
it.it_value.tv_usec = TimeToUS(itimer_interval) % 1000000;
it.it_interval = it.it_value;
if (setitimer(ITIMER_REAL, &it, NULL) != 0) {
sysErrorBelch("setitimer");
stg_exit(EXIT_FAILURE);
}
}
void
stopTicker(void)
{
struct itimerval it;
it.it_value.tv_sec = 0;
it.it_value.tv_usec = 0;
it.it_interval = it.it_value;
if (setitimer(ITIMER_REAL, &it, NULL) != 0) {
sysErrorBelch("setitimer");
stg_exit(EXIT_FAILURE);
}
}
void
exitTicker (bool wait STG_UNUSED)
{
return;
}
int
rtsTimerSignal(void)
{
return SIGALRM;
// Using SIGALRM can leads to problems, see #850. But we have no
// option if timer_create() is not available.
}
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