Can you get asleep and be awakened?

[Maurizio Colucci <seguso forever tin it>]

Hello, 

I am developing this free file manager (see screenshots and
download it at http://segusoland.sourceforge.net ! It is already working.) 
with SWI-prolog and GTK+, and I need to schedule actions to be executed in 
the future. For example, you could choose to shut down the computer at a 
precise time. 

I don't know where to start. I know that I need to register myself to some 
kind of timer and get asleep. But where? I already get asleep waiting for a 
GTK event... I cannot be sleeping in two places. So I guess GTK should 
provide this kind of functionality (awaking you at a precidse time). Could 
you please give me some hint, so we can all use my program :-) ? 

Thank you.
-- 
Best Regards,
Maurizio Colucci
Please remove the uppercase letters "S,P,A,M":
seSgPuAsMo forever tin it