man poll_scroll (3): Checks the status of a scroll request with triple buffering. Allegro game programming library.

poll_scroll(3) Checks the status of a scroll request with triple buffering. Allegro game programming library.

SYNOPSIS

#include <allegro.h>

int poll_scroll();

This function is used for triple buffering. It checks the status of a hardware scroll previously initiated by the request_scroll() routine.

Returns non-zero if it is still waiting to take place, and zero if the requested scroll has already happened.