On 2016-07-28 23:08:13 -0400, Robert Haas wrote: > On Thu, Jul 28, 2016 at 7:29 PM, Andres Freund <and...@anarazel.de> wrote: > > I think just iterating through the active snapshots would have been > > fine. Afaics there's no guarantee that the first active snapshot pushed > > is the relevant one - in contrast to registered one, which are ordered > > by virtue of the heap. > > I think the oldest snapshot has to be on the bottom of the stack; how not?
Well, one might push a previously acuired (and registered) snapshot onto the stack. Afaics that'll only happen if the snapshot is already registered, but I'm not sure. -- Sent via pgsql-hackers mailing list (email@example.com) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers