al_unregister_event_source - Allegro 5 API

       Unregister  an event source with an event queue.  If the event source is not actually registered with the
       event queue, nothing happens.

       If the queue had any events in it which originated from the event source, they will no longer be  in  the
       queue after this call.

       al_unregister_event_source - Allegro 5 API

al_register_event_source(3alleg5)

Allegro reference manual                                                     al_unregister_event_source(3alleg5)

              #include <allegro5/allegro.h>

              void al_unregister_event_source(ALLEGRO_EVENT_QUEUE *queue,
                 ALLEGRO_EVENT_SOURCE *source)