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Background workers without shared memory access have been broken on EXEC_BACKEND / windows builds since shortly after background workers have been introduced, without that being reported. Clearly they are not commonly used. The problem is that bgworker startup requires to be attached to shared memory in EXEC_BACKEND child processes. StartBackgroundWorker() detaches from shared memory for unconnected workers, but at that point we already have initialized subsystems referencing shared memory. Fixing this problem is not entirely trivial, so removing the option to not be connected to shared memory seems the best way forward. In most use cases the advantages of being connected to shared memory far outweigh the disadvantages. As there have been no reports about this issue so far, we have decided that it is not worth trying to address the problem in the back branches. Per discussion with Alvaro Herrera, Robert Haas and Tom Lane. Author: Andres Freund <andres@anarazel.de> Discussion: https://postgr.es/m/20210802065116.j763tz3vz4egqy3w@alap3.anarazel.de
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: https://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 https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.