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The "pos" variable is modified within PG_TRY and then referenced within PG_CATCH, so for strict POSIX conformance it must be marked volatile. Superficially the code looked safe because pos's address was taken, which was sufficient to force it into memory ... but it's not sufficient to ensure that the compiler applies updates exactly where the program text says to. The volatility marking has to extend into a couple of subroutines too, but I think that's probably a good thing because the risk of out-of-order updates is mostly in those subroutines not asyncQueueReadAllNotifications() itself. In principle the compiler could have re-ordered operations such that an error could be thrown while "pos" had an incorrect value. It's unclear how real the risk is here, but for safety back-patch to all active branches.
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/.