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Michael Paquier 734c057a89 Add assertion in pgstat_write_statsfile() about processes allowed
This routine can currently only be called from the postmaster in
single-user mode or the checkpointer, but there was no sanity check to
make sure that this was always the case.

This has proved to be useful when hacking the zone (at least to me), to
make sure that the write of the pgstats file happens at shutdown, as
wanted by design, in the correct process context.

Discussion: https://postgr.es/m/ZnEiqAITL-VgZDoY@paquier.xyz
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README.md

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.

Copyright and license information can be found in the file COPYRIGHT.

General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.

The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.