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evtimer: optimized adding

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This commit is contained in:
Josarn 2018-04-20 04:26:16 +02:00
parent ded2a44c77
commit 111f021eb3
1 changed files with 17 additions and 6 deletions
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23
sys/evtimer/evtimer.c
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@ -35,8 +35,7 @@
* handle the pointer hack in this function */
void evtimer_add_event_to_list(evtimer_t *evtimer, evtimer_event_t *event)
{
uint32_t delta_sum = 0;
DEBUG("evtimer: new event offset %" PRIu32 " ms\n", event->offset);
/* we want list->next to point to the first list element. thus we take the
* *address* of evtimer->events, then cast it from (evtimer_event_t **) to
* (evtimer_event_t*). After that, list->next actually equals
@ -45,20 +44,32 @@ void evtimer_add_event_to_list(evtimer_t *evtimer, evtimer_event_t *event)
while (list->next) {
evtimer_event_t *list_entry = list->next;
if ((list_entry->offset + delta_sum) > event->offset) {
/* Stop when new event time is nearer then next */
if (event->offset < list_entry->offset) {
DEBUG("evtimer: next %" PRIu32 " < %" PRIu32 " ms\n",
event->offset, list_entry->offset);
break;
}
delta_sum += list_entry->offset;
/* Set event offset relative to previous event */
event->offset -= list_entry->offset;
list = list->next;
}
DEBUG("evtimer: new event relativ offset %" PRIu32 " ms\n", event->offset);
/* Set found next bigger event after new event */
event->next = list->next;
if (list->next) {
/* Set offset following event relative to new event */
evtimer_event_t *next_entry = list->next;
next_entry->offset += delta_sum;
DEBUG("evtimer: recalculate offset for %" PRIu32 " ms\n",
next_entry->offset);
next_entry->offset -= event->offset;
DEBUG("evtimer: resulting new event offset %" PRIu32 " ms\n",
next_entry->offset);
}
event->offset -= delta_sum;
list->next = event;
}