Re: Why is citext/regress failing on hamerkop?

On Thu, May 16, 2024 at 9:46 AM Thomas Munro <thomas(dot)munro(at)gmail(dot)com> wrote:
> Alright, unless anyone has an objection or ideas for improvements, I'm
> going to go ahead and back-patch this slightly tidied up version
> everywhere.

Of course as soon as I wrote that I thought of a useful improvement
myself: as far as I can tell, you only need to do the extra poll on
the first wait for WL_SOCKET_READABLE for any given WaitEventSet. I
don't think it's needed for later waits done by long-lived
WaitEventSet objects, so we can track that with a flag. That avoids
adding new overhead for regular backend socket waits after
authentication, it's just in these code paths that do a bunch of
WaitLatchOrSocket() calls that we need to consider FD_CLOSE events
lost between the cracks.

I also don't know if the condition should include "&& received == 0".
It probably doesn't make much difference, but by leaving that off we
don't have to wonder how peeking interacts with events, ie if it's a
problem that we didn't do the "reset" step. Thinking about that, I
realised that I should probably set reset = true in this new return
path, just like the "normal" WL_SOCKET_READABLE notification path,
just to be paranoid. (Programming computers you don't have requires
extra paranoia.)

Any chance you could test this version please Alexander?