al_signal_cond - Man Page

#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(3) but al_signal_cond(3) may be more efficient when it’s applicable.

al_broadcast_cond(3).

al_broadcast_cond(3), al_wait_cond(3).