al_broadcast_cond - Allegro 5 API

       Unblock  all  threads  currently waiting on a condition variable.  That is, broadcast that some condition
       which those threads were waiting for has become true.

       al_broadcast_cond - Allegro 5 API

al_signal_cond(3alleg5).

              Note: The pthreads spec says to  lock  the  mutex  associated  with  cond  before  signalling  for
              predictable scheduling behaviour.

Allegro reference manual                                                              al_broadcast_cond(3alleg5)

              #include <allegro5/allegro.h>

              void al_broadcast_cond(ALLEGRO_COND *cond)