/*===========================================================================*
* pm_expire_timers *
*===========================================================================*/
PUBLIC void pm_expire_timers(clock_t now)
{
clock_t next_time;
/* Check for expired timers and possibly reschedule an alarm. */
tmrs_exptimers(&pm_timers, now, &next_time);
if (next_time > 0) {
if (sys_setalarm(next_time, 1) != OK)
panic(__FILE__, "PM expire timer couldn't set alarm.", NO_NUM);
}
}
/*===========================================================================*
* expire_timers *
*===========================================================================*/
void expire_timers(clock_t now)
{
clock_t next_time;
/* Check for expired timers. Use a global variable to indicate that
* watchdog functions are called, so that sys_setalarm() isn't called
* more often than necessary when set_timer or cancel_timer are called
* from these watchdog functions. */
expiring = 1;
tmrs_exptimers(&timers, now, &next_time);
expiring = 0;
/* Reschedule an alarm if necessary. */
if (next_time > 0) {
if (sys_setalarm(next_time, 1) != OK)
panic("expire_timers: couldn't set alarm");
}
}
/*
* Expire all timers that were set to expire before/at the given current time.
*/
void
expire_timers(clock_t now)
{
clock_t next_time;
int r, have_timers;
/*
* Check for expired timers. Use a global variable to indicate that
* watchdog functions are called, so that sys_setalarm() isn't called
* more often than necessary when set_timer or cancel_timer are called
* from these watchdog functions.
*/
expiring = TRUE;
have_timers = tmrs_exptimers(&timers, now, &next_time);
expiring = FALSE;
/* Reschedule an alarm if necessary. */
if (have_timers) {
if ((r = sys_setalarm(next_time, TRUE /*abs_time*/)) != OK)
panic("expire_timers: couldn't set alarm: %d", r);
}
}
/*
* The boot processos timer interrupt handler. In addition to non-boot cpus it
* keeps real time and notifies the clock task if need be
*/
PUBLIC int timer_int_handler(void)
{
/* Update user and system accounting times. Charge the current process
* for user time. If the current process is not billable, that is, if a
* non-user process is running, charge the billable process for system
* time as well. Thus the unbillable process' user time is the billable
* user's system time.
*/
struct proc * p, * billp;
/* FIXME watchdog for slave cpus! */
#ifdef CONFIG_WATCHDOG
/*
* we need to know whether local timer ticks are happening or whether
* the kernel is locked up. We don't care about overflows as we only
* need to know that it's still ticking or not
*/
watchdog_local_timer_ticks++;
#endif
if (cpu_is_bsp(cpuid))
realtime++;
/* Update user and system accounting times. Charge the current process
* for user time. If the current process is not billable, that is, if a
* non-user process is running, charge the billable process for system
* time as well. Thus the unbillable process' user time is the billable
* user's system time.
*/
p = get_cpulocal_var(proc_ptr);
billp = get_cpulocal_var(bill_ptr);
p->p_user_time++;
if (! (priv(p)->s_flags & BILLABLE)) {
billp->p_sys_time++;
}
/* Decrement virtual timers, if applicable. We decrement both the
* virtual and the profile timer of the current process, and if the
* current process is not billable, the timer of the billed process as
* well. If any of the timers expire, do_clocktick() will send out
* signals.
*/
if ((p->p_misc_flags & MF_VIRT_TIMER)){
p->p_virt_left--;
}
if ((p->p_misc_flags & MF_PROF_TIMER)){
p->p_prof_left--;
}
if (! (priv(p)->s_flags & BILLABLE) &&
(billp->p_misc_flags & MF_PROF_TIMER)){
billp->p_prof_left--;
}
/*
* Check if a process-virtual timer expired. Check current process, but
* also bill_ptr - one process's user time is another's system time, and
* the profile timer decreases for both!
*/
vtimer_check(p);
if (p != billp)
vtimer_check(billp);
/* Update load average. */
load_update();
if (cpu_is_bsp(cpuid)) {
/* if a timer expired, notify the clock task */
if ((next_timeout <= realtime)) {
tmrs_exptimers(&clock_timers, realtime, NULL);
next_timeout = (clock_timers == NULL) ?
TMR_NEVER : clock_timers->tmr_exp_time;
}
if (do_serial_debug)
do_ser_debug();
}
return(1); /* reenable interrupts */
}