Re: Can a child process detect postmaster death when in pg_usleep?

On Tue, Jul 6, 2021 at 4:33 PM Michael Paquier <michael@paquier.xyz> wrote:
>
> On Tue, Jul 06, 2021 at 03:54:07PM +0530, Bharath Rupireddy wrote:
> > Thanks. You are right. The issue is due to the MyLatch being set by
> > SwitchToSharedLatch before WaitLatch. If we use (WL_TIMEOUT |
> > WL_EXIT_ON_PM_DEATH), then the backends will honour the
> > post_auth_delay as well as detect the postmaster death. Since we are
> > not using WL_LATCH_SET, I removed ResetLatch. Also, added some
> > comments around why we are not using WL_LATCH_SET.
> >
> > For PreAuthDelay, there's no problem to use WL_LATCH_SET as MyLatch
> > still points to the local latch(which is not set) in
> > BackendInitialize().
>
> FWIW, I think that it could be a good idea to use the same set of
> flags for all the pre/post_auth_delay paths for consistency.  That's
> useful when grepping for one.  Please note that I don't plan to look
> more at this patch set for this CF as I am not really excited by the
> updates involving developer options, and I suspect more issues like
> the one I found upthread so this needs a close lookup.
>
> If somebody else wishes to look at it, please feel free, of course.

Thanks. Anyways, I removed WL_LATCH_SET for PreAuthDelay as well. PSA v4 patch.

Regards,
Bharath Rupireddy.