al_rest - Allegro 5 API

       Waits  for  the  specified  number of seconds.  This tells the system to pause the current thread for the
       given amount of time.  With some operating systems, the accuracy can be in the order of 10ms.   That  is,
       even

              al_rest(0.000001)

       might pause for something like 10ms.  Also see the section on Timer routines for easier ways to time your
       program without using up all CPU.

Allegro reference manual                                                                        al_rest(3alleg5)

       al_rest - Allegro 5 API

              #include <allegro5/allegro.h>

              void al_rest(double seconds)