al_create_timer - Allegro 5 API
ALLEGRO_TIMER *al_create_timer(double speed_secs)
Allocates and initializes a timer. If successful, a pointer to a new timer
object is returned, otherwise NULL is returned. speed_secs is in
seconds per “tick”, and must be positive. The new timer is
Usage note: typical granularity is on the order of microseconds,
but with some drivers might only be milliseconds.