I assume he just assumed poll() actually polls. I doesn't. It is just
like select().
---------------------------------------------------------------------------
Tom Lane wrote:
> "Christopher Kings-Lynne" <chriskl@familyhealth.com.au> writes:
> >>> Has anyone ever thought about adding kqueue (for *BSD) support to
> >>> Postgres, instead of using select?
> >>
> >> Why? poll() is standard. kqueue isn't, AFAIK.
>
> > It's supposed be a whole heap faster - there is no polling involved...
>
> Supposed by whom? Faster than what? And how would it not poll?
>
> The way libpq uses this call, it's either probing for current status
> (timeout=0) or it's willing to block, possibly indefinitely, until the
> desired condition arises. It does not sit there in a busy-wait loop.
> I can't see any reason to think that an OS-specific API would give
> any marked difference in performance.
>
> regards, tom lane
>
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--
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