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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.