Re: getting processor numbers

[H. Peter Anvin]

Jeremy Fitzhardinge wrote:
> H. Peter Anvin wrote:
> > Sounds like it would need a device which can be waited upon for changes.
>
> A vdso-like shared page could have a futex in it.

Yes, but a futex couldn't be waited upon with a bunch of other things as 
part of a poll or a select.  The cost of reading the information is minimal.

	-hpa
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