83aadbeb96
Previously we had a fallback implementation that made a harmless system call, based on the assumption that system calls must contain a memory barrier. That shouldn't be reached on any current system, and it seems highly likely that we can easily find out how to request explicit memory barriers, if we've already had to find out how to do atomics on a hypothetical new system. Removed comments and a function name referred to a spinlock used for fallback memory barriers, but that changed in 1b468a13, which left some misleading words behind in a few places. Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi> Suggested-by: Andres Freund <andres@anarazel.de> Discussion: https://postgr.es/m/721bf39a-ed8a-44b0-8b8e-be3bd81db748%40technowledgy.de Discussion: https://postgr.es/m/3351991.1697728588%40sss.pgh.pa.us
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/.