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Since a backend adds itself to the global listener array during Exec_ListenPreCommit, it's inappropriate for it to remove itself during Exec_UnlistenCommit or Exec_UnlistenAllCommit --- that leads to failure when committing a transaction that did UNLISTEN then LISTEN, since we end up not registered though we should be. (This leads to missing later notifications, or to Assert failures in assert-enabled builds.) Instead deal with deregistering at the bottom of AtCommit_Notify, when we know the final state of the listenChannels list. Also, simplify the representation of registration status by replacing the transient backendHasExecutedInitialListen flag with an amRegisteredListener flag. Per report from Greg Sabino Mullane. Back-patch to 9.0, where the problem was introduced during the LISTEN/NOTIFY rewrite. |
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README.git |
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. Changes between all PostgreSQL releases are recorded in the file HISTORY. 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/.