Function doconfigtimer

freebsd/kern/kern_clocksource.c:443–473

* Reconfigure specified per-CPU timer on other CPU. Called from IPI handler. */

 * Reconfigure specified per-CPU timer on other CPU. Called from IPI handler.
 */
static int
doconfigtimer(void)
{
	sbintime_t now;
	struct pcpu_state *state;

	state = DPCPU_PTR(timerstate);
	switch (atomic_load_acq_int(&state->action)) {
	case 1:
		now = sbinuptime();
		ET_HW_LOCK(state);
		loadtimer(now, 1);
		ET_HW_UNLOCK(state);
		state->handle = 0;
		atomic_store_rel_int(&state->action, 0);
		return (1);
	case 2:
		ET_HW_LOCK(state);
		et_stop(timer);
		ET_HW_UNLOCK(state);
		state->handle = 0;
		atomic_store_rel_int(&state->action, 0);
		return (1);
	}
	if (atomic_readandclear_int(&state->handle) && !busy) {
		now = sbinuptime();
		handleevents(now, 0);
		return (1);
	}
	return (0);
}

/*
 * Reconfigure specified timer.