Re: [HACKERS] Error while creating subscription when server isrunning in single user mode

On 2017-06-06 12:53:21 -0700, Andres Freund wrote:
> On 2017-06-06 15:48:42 -0400, Robert Haas wrote:
> > On Fri, Jun 2, 2017 at 3:24 PM, Andres Freund <andres@anarazel.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.

Here's the patch for that, also addressing some issues I found while
updating those callsites (separate thread started, too).

- Andres

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