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We've had repeated troubles over the years with failures to initialize spinlocks correctly; see 6b93fcd14 for a recent example. Most of the time, on most platforms, such oversights can escape notice because all-zeroes is the expected initial content of an slock_t variable. The only platform we have where the initialized state of an slock_t isn't zeroes is HPPA, and that's practically gone in the wild. To make it easier to catch such errors without needing one of those, adjust the --disable-spinlocks code so that zero is not a valid value for an slock_t for it. In passing, remove a bunch of unnecessary #include's from spin.c; commit daa7527afc227443 removed all the intermodule coupling that made them necessary.
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/.