On Wed, Aug 12, 2009 at 10:41 AM, Michael Schnell <[email protected]>wrote:

> Jim Donelson wrote:
> >
> > I wonder why (on an SP machine) you don't just disable interrupts for a
> > few instructions and give yourself an atomic dec?
>


>
> With many archs it's not possible to disable/enable interrupts in
> user-space.
>

But, then if you have an MMU, you have atomic instructions.


>
> -Michael
>
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