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Commit 43cd468cf01007f3 added some wording to create_policy.sgml purporting to warn users against a race condition of the sort that had been noted some time ago by Peter Geoghegan. However, that warning was far too vague to be useful (or at least, I completely failed to grasp what it was on about). Since the problem case occurs with a security design pattern that lots of people are likely to try to use, we need to be as clear as possible about it. Provide a concrete example in the main-line docs in place of the original warning.
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/.