Provided by: allegro4-doc_4.4.3.1-2_all 
      
    
NAME
       retrace_count - Retrace count simulator. Allegro game programming library.
SYNOPSIS
       #include <allegro.h>
       extern volatile int retrace_count;
DESCRIPTION
       If  the retrace simulator is installed, this count is incremented on each vertical retrace; otherwise, if
       the refresh rate is known, the count is incremented at the same rate (ignoring retraces);  otherwise,  it
       is  incremented  70  times a second. This provides a way of controlling the speed of your program without
       installing user timer functions.
SEE ALSO
       ex3d(3alleg4), exblend(3alleg4), exdbuf(3alleg4), exflip(3alleg4), exlights(3alleg4)
Allegro                                           version 4.4.3                           retrace_count(3alleg4)