int xtimer_remove(xtimer_t *timer)
{
if (!_is_set(timer)) {
return 0;
}
unsigned state = disableIRQ();
int res = 0;
if (timer_list_head == timer) {
uint32_t next;
timer_list_head = timer->next;
if (timer_list_head) {
/* schedule callback on next timer target time */
next = timer_list_head->target - XTIMER_OVERHEAD;
}
else {
next = _mask(0xFFFFFFFF);
}
_lltimer_set(next);
}
else {
res = _remove_timer_from_list(&timer_list_head, timer) ||
_remove_timer_from_list(&overflow_list_head, timer) ||
_remove_timer_from_list(&long_list_head, timer);
}
timer->target = 0;
timer->long_target = 0;
restoreIRQ(state);
return res;
}
void _xtimer_set64(xtimer_t *timer, uint32_t offset, uint32_t long_offset)
{
DEBUG(" _xtimer_set64() offset=%" PRIu32 " long_offset=%" PRIu32 "\n", offset, long_offset);
if (!long_offset) {
/* timer fits into the short timer */
xtimer_set(timer, (uint32_t) offset);
}
else {
int state = irq_disable();
if (_is_set(timer)) {
_remove(timer);
}
_xtimer_now64(&timer->target, &timer->long_target);
timer->target += offset;
timer->long_target += long_offset;
if (timer->target < offset) {
timer->long_target++;
}
_add_timer_to_long_list(&long_list_head, timer);
irq_restore(state);
DEBUG("xtimer_set64(): added longterm timer (long_target=%" PRIu32 " target=%" PRIu32 ")\n",
timer->long_target, timer->target);
}
}
void xtimer_remove(xtimer_t *timer)
{
int state = irq_disable();
if (_is_set(timer)) {
_remove(timer);
}
irq_restore(state);
}
int _xtimer_set_absolute(xtimer_t *timer, uint32_t target)
{
uint32_t now = xtimer_now();
int res = 0;
DEBUG("timer_set_absolute(): now=%" PRIu32 " target=%" PRIu32 "\n", now, target);
timer->next = NULL;
if ((target >= now) && ((target - XTIMER_BACKOFF) < now)) {
/* backoff */
xtimer_spin_until(target + XTIMER_BACKOFF);
_shoot(timer);
return 0;
}
unsigned state = irq_disable();
if (_is_set(timer)) {
_remove(timer);
}
timer->target = target;
timer->long_target = _long_cnt;
if (target < now) {
timer->long_target++;
}
if ( (timer->long_target > _long_cnt) || !_this_high_period(target) ) {
DEBUG("xtimer_set_absolute(): the timer doesn't fit into the low-level timer's mask.\n");
_add_timer_to_long_list(&long_list_head, timer);
}
else {
if (_xtimer_lltimer_mask(now) >= target) {
DEBUG("xtimer_set_absolute(): the timer will expire in the next timer period\n");
_add_timer_to_list(&overflow_list_head, timer);
}
else {
DEBUG("timer_set_absolute(): timer will expire in this timer period.\n");
_add_timer_to_list(&timer_list_head, timer);
if (timer_list_head == timer) {
DEBUG("timer_set_absolute(): timer is new list head. updating lltimer.\n");
_lltimer_set(target - XTIMER_OVERHEAD);
}
}
}
irq_restore(state);
return res;
}
