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

al_add_timer_count - Allegro 5 API

#include <allegro5/allegro.h>
void al_add_timer_count(ALLEGRO_TIMER *timer, int64_t diff)
    

Add diff to the timer's counter value. This is similar to writing:

al_set_timer_count(timer, al_get_timer_count(timer) + diff);

except that the addition is performed atomically, so no ticks will be lost.

al_set_timer_count(3alleg5)

Allegro reference manual