Re: getting processor numbers

H. Peter Anvin
2007-04-04T00:38:55Z

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