0709b7ee72
Previously, they functioned as barriers against CPU reordering but not compiler reordering, an odd API that required extensive use of volatile everywhere that spinlocks are used. That's error-prone and has negative implications for performance, so change it. In theory, this makes it safe to remove many of the uses of volatile that we currently have in our code base, but we may find that there are some bugs in this effort when we do. In the long run, though, this should make for much more maintainable code. Patch by me. Review by Andres Freund.
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/.