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In addition to __sync_fetch_and_add, gcc offers __sync_fetch_and_sub, __sync_fetch_and_and, and __sync_fetch_and_or, which correspond directly to primitive atomic ops that we want. Testing shows that in some cases they generate better code than our generic implementations, so use them. We've assumed that configure's test for __sync_val_compare_and_swap is sufficient to allow assuming that __sync_fetch_and_add is available, so make the same assumption for these functions. Should that prove to be wrong, we can add more configure tests. Yura Sokolov, reviewed by Jesper Pedersen and myself Discussion: https://postgr.es/m/7f65886daca545067f82bf2b463b218d@postgrespro.ru
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/.