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retrace_count(3)                Allegro manual                retrace_count(3)

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(3), exblend(3), exdbuf(3), exflip(3), exlights(3)

Allegro                          version 4.4.2                retrace_count(3)