al_get_monitor_refresh_rate - Allegro 5 API

       Returns the current refresh rate of a monitor attached to the display adapter.

       al_get_monitor_refresh_rate - Allegro 5 API

al_get_monitor_info(3alleg5)

Allegro reference manual                                                    al_get_monitor_refresh_rate(3alleg5)

       5.2.6

              [UnstableAPI]: This is an experimental feature and currently only works on Windows.

              #include <allegro5/allegro.h>

              int al_get_monitor_refresh_rate(int adapter)