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Historically this message has been emitted at the end of ShutdownXLOG(). That's not an insane place for it in a standalone backend, but in the postmaster environment we've grown a fair amount of stuff that happens later, including archiver/walsender shutdown, stats collector shutdown, etc. Recent buildfarm experimentation showed that on slower machines there could be many seconds' delay between finishing ShutdownXLOG() and actual postmaster exit. That's fairly confusing, both for testing purposes and for DBAs. Hence, move the code that prints this message into UnlinkLockFiles(), so that it comes out just after we remove the postmaster's pidfile. That is a more appropriate definition of "is shut down" from the point of view of "pg_ctl stop", for example. In general, removing the pidfile should be the last externally-visible action of either a postmaster or a standalone backend; compare commit d73d14c271653dff10c349738df79ea03b85236c for instance. So this seems like a reasonably future-proof approach.
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: http://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.