al_wait_cond_until - Allegro 5 API

       Like  al_wait_cond(3alleg5)  but  the  call  can  return  if  the absolute time passes timeout before the
       condition is signalled.

       Returns zero on success, non-zero if the call timed out.

       al_wait_cond_until - Allegro 5 API

al_wait_cond(3alleg5)

Allegro reference manual                                                             al_wait_cond_until(3alleg5)

              #include <allegro5/allegro.h>

              int al_wait_cond_until(ALLEGRO_COND *cond, ALLEGRO_MUTEX *mutex,
                 const ALLEGRO_TIMEOUT *timeout)