Re: Resetting PGPROC atomics in ProcessInit() - Mailing list pgsql-hackers

From Robert Haas
Subject Re: Resetting PGPROC atomics in ProcessInit()
Date
Msg-id CA+TgmobCtQKa=T52tqsTEQhbd_JLx2woqM3g_G_8ObyxCc7-pA@mail.gmail.com
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In response to Resetting PGPROC atomics in ProcessInit()  (Andres Freund <andres@anarazel.de>)
Responses Re: Resetting PGPROC atomics in ProcessInit()
List pgsql-hackers
On Sat, Oct 27, 2018 at 6:41 AM Andres Freund <andres@anarazel.de> wrote:
> I just noticed, while working on a patch adding things to PGPROC, that
> the group clearning patches for the proc array and clog reset atomics in
> InitProcess().
>
> I'm not a big fan of that, because it means that it's not safe to look
> at the atomics of backends that aren't currently in use.  Is there any
> reason to not instead initialize them in InitProcGlobal() and just
> assert in InitProcess() that they're 0?  If they're not, we'd be in deep
> trouble anyway, no?

I think you are correct.  I think it would be better in general for
InitProcess() to Assert() rather than reinitializing.  Apart from this
issue, it's not free.

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company


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