On Wed, May 10, 2017 at 8:39 PM, Masahiko Sawada <sawada.mshk@gmail.com> wrote:
> Currently, the relation extension lock is implemented using
> heavyweight lock manager and almost functions (except for
> brin_page_cleanup) using LockRelationForExntesion use it with
> ExclusiveLock mode. But actually it doesn't need multiple lock modes
> or deadlock detection or any of the other functionality that the
> heavyweight lock manager provides. I think It's enough to use
> something like LWLock. So I'd like to propose to change relation
> extension lock management so that it works using LWLock instead.
That's not a good idea because it'll make the code that executes while
holding that lock noninterruptible.
Possibly something based on condition variables would work better.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
