enable_triple_buffer - Enables triple buffering. Allegro game programming library.

       If  the  GFX_CAN_TRIPLE_BUFFER bit of the gfx_capabilities field is not set, you can attempt to enable it
       by calling this function. In particular if you are running in mode-X in a  clean  DOS  environment,  this
       routine will enable the timer retrace simulator, which will activate the triple buffering functions.

       enable_triple_buffer - Enables triple buffering. Allegro game programming library.

       Returns zero if triple buffering is enabled, -1 otherwise.

gfx_capabilities(3alleg4),   request_scroll(3alleg4),   request_video_bitmap(3alleg4),   ex3buf(3alleg4),
       exupdate(3alleg4)

Allegro                                           version 4.4.3                    enable_triple_buffer(3alleg4)

#include<allegro.h>intenable_triple_buffer();