From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Tue, 6 Feb 2007 12:46:11 -0800 (PST)

quoted text
> And for user space, it means that we pass the _one_ thing around that we 
> need for both identifying the async operation to the kernel (the "cookie") 
> for wait or cancel, and the place where we expect the return value to be 
> found (which in turn can _easily_ represent a whole "struct aiocb *", 
> since the return value obviously has to be embedded in there anyway).

I really think that Evgeniy's kevent is a good event notification
mechanism for anything, including AIO.

Events are events, applications want a centralized way to receive and
process them.

It's already implemented, and if there are tangible problems with it,
Evgeniy has been excellent at responding to criticism and implementing
suggested changes to the interfaces.
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