d_yield_proc - Invisible dialog procedure that yields CPU time slices. Allegro game programming library.

       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.

       d_yield_proc - Invisible dialog procedure that yields CPU time slices. Allegro game programming library.

rest(3alleg4), exgui(3alleg4)

Allegro                                           version 4.4.3                            d_yield_proc(3alleg4)

#include<allegro.h>intd_yield_proc(intmsg,DIALOG*d,intc);