> > Yes, this fine for polling, but what about when the backend
> > is *sleeping*? As I understand the backend main processing
> > loop, (and my understanding is far from complete...) the
> > backend waits on 'read from socket' when it is not doing
> > anything. Correct me if I'm wrong, but this is not
> > interruptible from an APC.
> It is if you use WaitForMultipleObjectsEx(). Or if you use
> WSAEventSelect() and then WaitForSingleObjectEx() on the event (this
> emulates select() the closest)
I'd just as soon as avoid WSAEventSelect; I think that will complicate
matters quite a bit.
FWIW, in a multithreaded version of postgres I'm fooling around with, I
replaced the recv call (where backends spend most of their time waiting)
which a select(small timeout)/SleepEx(0) "busy" loop, which calls to recv
when ready. Works just fine.
Cheers,
Claudio
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