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From: Andres Freund <andres@anarazel.de>
To: Robert Haas <robertmhaas@gmail.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Васильев Дмитрий <d.vasilyev@postgrespro.ru>
Cc: pgsql-hackers@postgresql.org <pgsql-hackers@postgresql.org>
Subject: Re: Performance degradation in commit ac1d794
Date: Thu, 14 Jan 2016 18:14:21 +0100
Message-ID: <20160114171421.GK10941@awork2.anarazel.de> (raw)
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On 2016-01-14 12:07:23 -0500, Robert Haas wrote:
> > Do we want to provide a backward compatible API for all this? I'm fine
> > either way.
>
> How would that work?

I'm thinking of something like;

int WaitOnLatchSet(LatchEventSet *set, int wakeEvents, long timeout);

int
WaitLatchOrSocket(volatile Latch *latch, int wakeEvents, pgsocket sock,long timeout)
{
        LatchEventSet set;

        LatchEventSetInit(&set, latch);

        if (sock != PGINVALID_SOCKET)
           LatchEventSetAddSock(&set, sock);

        return WaitOnLatchSet(set, wakeEvents, timeout);
}

I think we'll need to continue having wakeEvents and timeout parameters
for WaitOnLatchSet, we quite frequently want to wait socket
readability/writability, not wait on the socket, or have/not have
timeouts.



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  Cc: andres@anarazel.de, robertmhaas@gmail.com, tgl@sss.pgh.pa.us, d.vasilyev@postgrespro.ru
  Subject: Re: Performance degradation in commit ac1d794
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