DOKK / manpages / debian 10 / allegro5-doc / al_signal_cond.3alleg5.en
al_signal_cond(3alleg5) al_signal_cond(3alleg5)

al_signal_cond - Allegro 5 API

#include <allegro5/allegro.h>
void al_signal_cond(ALLEGRO_COND *cond)
    

Unblock at least one thread waiting on a condition variable.

Generally you should use al_broadcast_cond(3alleg5) but al_signal_cond(3alleg5) may be more efficient when it's applicable.

al_broadcast_cond(3alleg5).

Allegro reference manual