From: | Andres Freund <andres(at)anarazel(dot)de> |
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To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
Cc: | Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, tushar <tushar(dot)ahuja(at)enterprisedb(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Error while creating subscription when server is running in single user mode |
Date: | 2017-06-06 19:53:21 |
Message-ID: | 20170606195321.sjmenrfgl2nu6j63@alap3.anarazel.de |
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Lists: | pgsql-hackers |
On 2017-06-06 15:48:42 -0400, Robert Haas wrote:
> On Fri, Jun 2, 2017 at 3:24 PM, Andres Freund <andres(at)anarazel(dot)de> wrote:
> > Latches work in single user mode, it's just that the new code for some
> > reason uses uninitialized memory as the latch. As I pointed out above,
> > the new code really should just use MyLatch instead of
> > MyProc->procLatch.
FWIW, I'd misremembered some code here, and we actually reach the
function initializing the shared latch, even in single user mode.
> We seem to have accumulated quite a few instance of that.
>
> [rhaas pgsql]$ git grep MyLatch | wc -l
> 116
> [rhaas pgsql]$ git grep 'MyProc->procLatch' | wc -l
> 33
>
> Most of the offenders are in src/backend/replication, but there are
> some that are related to parallelism as well (bgworker.c, pqmq.c,
> parallel.c, condition_variable.c). Maybe we (you?) should just go and
> change them all. I don't think using MyLatch instead of
> MyProc->procLatch has become automatic for everyone yet.
Nevertheless this should be changed. Will do.
- Andres
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