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Andres Freund 80a8f95b3b Remove support for background workers without BGWORKER_SHMEM_ACCESS.
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
2021-08-13 05:49:26 -07:00
config Remove configure-time thread safety checking (thread_test.c). 2021-07-24 12:16:39 -04:00
contrib Fix failure of btree_gin indexscans with "char" type and </<= operators. 2021-08-10 18:10:29 -04:00
doc Remove support for background workers without BGWORKER_SHMEM_ACCESS. 2021-08-13 05:49:26 -07:00
src Remove support for background workers without BGWORKER_SHMEM_ACCESS. 2021-08-13 05:49:26 -07:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.editorconfig Add .editorconfig 2019-12-18 09:13:13 +01:00
.git-blame-ignore-revs Add pgindent commit to git-blame-ignore-revs file. 2021-06-28 09:22:24 -07:00
.gitattributes gitattributes: Add new entry to silence whitespace error 2021-06-05 07:57:31 +02:00
.gitignore Support for optimizing and emitting code in LLVM JIT provider. 2018-03-22 11:05:22 -07:00
aclocal.m4 Remove configure-time probe for DocBook DTD. 2020-11-30 15:24:13 -05:00
configure Remove configure-time thread safety checking (thread_test.c). 2021-07-24 12:16:39 -04:00
configure.ac Remove configure-time thread safety checking (thread_test.c). 2021-07-24 12:16:39 -04:00
COPYRIGHT Update copyright for 2021 2021-01-02 13:06:25 -05:00
GNUmakefile.in add missing tag from commit b8c4261e5e 2021-07-01 15:47:46 -04:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Don't unset MAKEFLAGS in non-GNU Makefile. 2019-06-25 09:36:21 +12:00
README Canonicalize some URLs 2020-02-10 20:47:50 +01:00
README.git Canonicalize some URLs 2020-02-10 20:47:50 +01:00

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/.