> I agree with you except for:
> 
>  >  - one invoked when a process first asks for the event (invoked in
>  > 	that process).
> 
> I don't understand what this one would be for -- for copyting data into
> the kernel?  

nope, for preallocating any additional space needed so that code
called at interrupt level won't "lose" an event because of a temporary
resource shortage.

					- Bill