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Architecture reference material specifies this order, and s_lock.h inline assembly agrees. The former order failed to provide mutual exclusion to lwlock.c and perhaps to other clients. The two xlc buildfarm members, hornet and mandrill, have failed sixteen times with duplicate key errors involving pg_class_oid_index or pg_type_oid_index. Back-patch to 9.5, where commit b64d92f1a5602c55ee8b27a7ac474f03b7aee340 introduced atomics. Reviewed by Andres Freund and Tom Lane.
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: http://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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.