d_yield_proc - Man Page

#include <allegro.h>

int d_yield_proc(int msg, DIALOG *d, int c);

An invisible helper object that yields time slices for the scheduler (if the system supports it) when the GUI has nothing to do but waiting for user actions. You should put one instance of this object in each dialog  array because it may be needed on systems with an unusual scheduling  algorithm (for instance QNX) in order to make the GUI fully responsive.

rest(3), exgui(3)

exgui(3), rest(3).