al_unref_user_event - Man Page

#include <allegro5/allegro.h>

void al_unref_user_event(ALLEGRO_USER_EVENT *event)

Decrease the reference count of a user-defined event. This must be called on any user event that you get from al_get_next_event(3), al_peek_next_event(3), al_wait_for_event(3), etc. which is reference counted. This function does nothing if the event is not reference counted.

al_emit_user_event(3), ALLEGRO_USER_EVENT(3)

al_emit_user_event(3).