void ctl_events_set_clear(CTL_EVENT_SET_t *e, CTL_EVENT_SET_t set, CTL_EVENT_SET_t clear);
ctl_events_set_clear sets the events defined by set and clears the events defined by clear of the event set pointed to by e. ctl_events_set_clear will then search the task list, matching tasks that are waiting on the event set e and make them runnable if the match is successful.