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Commit da07a1e8 was broken for EXEC_BACKEND because I failed to realize that the MaxBackends recomputation needed to be duplicated by subprocesses in SubPostmasterMain. However, instead of having the value be recomputed at all, it's better to assign the correct value at postmaster initialization time, and have it be propagated to exec'ed backends via BackendParameters. MaxBackends stays as zero until after modules in shared_preload_libraries have had a chance to register bgworkers, since the value is going to be untrustworthy till that's finished. Heikki Linnakangas and Álvaro Herrera
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/.