al_flush_event_queue - Allegro 5 API

       Drops all events, if any, from the queue.

       al_flush_event_queue - Allegro 5 API

al_drop_next_event(3alleg5), al_is_event_queue_empty(3alleg5)

Allegro reference manual                                                           al_flush_event_queue(3alleg5)

              #include <allegro5/allegro.h>

              void al_flush_event_queue(ALLEGRO_EVENT_QUEUE *queue)