Sorry for my weak english, by preemption I mean forced context

(process) switch applied to my process.

My question is:

If I wrote and run my own program game in such way that it is 20 millisecond period work, then 5 millisecond sleep, and then windows pump (peek message/dispatch message) in loop again and again - Is it ever preempted by force in windows or no, this preemption doeas not occur ?

I suppose that this preemption would occur if i would not volountairy give control back to system by sleep or peek/dispatch in by larger amount of time - but here it will occur or no?

tnx for the answer