svn commit: r209119 - head/sys/sys
Gabor PALI
pgj at FreeBSD.org
Fri Jul 9 19:03:14 UTC 2010
On 07/09/10 20:50, Robert Watson wrote:
> I think I have an e-mail in my in queue from you suggesting an
> alternative approach that I haven't yet gotten to due to utter
> saturation here.
That is why I CC'ed svn-src-head@ :) (But I do not see any sign whether
my last email reached it -- I am not an that list.) I hope other
committers will help me with this, because I would like to use it in my
project, and I think it would be useful in general.
> I assume there are reasonable alternatives that work around the
> potential race with a small probability of a missed or extra update,
> or similar, which would be fine.
In a few words: As far as I know, 64-bit atomic counters could be
implemented by using cmpxchg8b or by a plain uint64_t variable protected
by some kind of locking(9).
Cheers,
:g
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