I wrote:
> Andres Freund <and...@anarazel.de> writes:
>> Given that poll() has been introduced in SRV3 - which IIRC was below our
>> usual baseline - and windows is not an issue for latch, I think it'd
>> be ok to rely on it.

> I think it's entirely reasonable to say that "if you want high performance
> you should have poll(3)".  Failing to build without it would be a harder
> sell, probably.

Hmm ... wait, I take that back.  poll() is required by SUS v2, which has
been our minimum baseline spec for a long time (even my pet dinosaur HPUX
has it).  As long as we have an answer for Windows, it's hard to argue
we can't require poll() elsewhere.

                        regards, tom lane

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