Date: Thu, 11 Nov 2021 11:50:00 -0800
From: Andres Freund <andres@anarazel.de>
To: Robert Haas <robertmhaas@gmail.com>
Cc: Thomas Munro <thomas.munro@gmail.com>,
	pgsql-hackers <pgsql-hackers@postgresql.org>
Subject: Re: Interrupts vs signals
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Hi,

On 2021-11-11 09:06:01 -0500, Robert Haas wrote:
> On Thu, Nov 11, 2021 at 12:27 AM Thomas Munro <thomas.munro@gmail.com> wrote:
> > > Depending on how you implement them, one difference could be whether / when
> > > "slow" system calls (recv, poll, etc) are interrupted.
> >
> > Hopefully by now all such waits are implemented with latch.c facilities?
> 
> Do read(), write(), etc. count? Because we certainly have raw calls to
> those functions in lots of places.

They can count, but only when used for network sockets or pipes ("slow
devices" or whatever the posix language is). Disk IO doesn't count as that. So
I don't think it'd be a huge issue.

Greetings,

Andres Freund