get_refresh_rate - Returns the current refresh rate. Allegro game programming library.

       Returns the current refresh rate, if known (not all drivers are able to report this information). Returns
       zero if the actual rate is unknown.

       get_refresh_rate - Returns the current refresh rate. Allegro game programming library.

request_refresh_rate(3alleg4)

Allegro                                           version 4.4.3                        get_refresh_rate(3alleg4)

#include<allegro.h>intget_refresh_rate(void);