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As currently designed, with a callback registered in a ERROR_CLEANUP block, the shutdown callback would get called twice when updating archive_library on SIGHUP, which is something that we want to avoid to ease the life of extension writers. Anyway, an ERROR in the archiver process is treated as a FATAL, stopping it immediately, hence there is no need for a ERROR_CLEANUP block. Instead of that, the shutdown callback is not called upon before_shmem_exit(), giving to the modules the opportunity to do any cleanup actions before the server shuts down its subsystems. While on it, this commit adds some testing coverage for the shutdown callback. Neither shell_archive nor basic_archive have been using it, and one is added to shell_archive, whose trigger is checked in a TAP test through a shutdown sequence. Author: Nathan Bossart, Bharath Rupireddy Reviewed-by: Kyotaro Horiguchi, Michael Paquier Discussion: https://postgr.es/m/20221015221328.GB1821022@nathanxps13 Backpatch-through: 15 |
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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: 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/.