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Commit 197e4af9 refactored the initialization of the libc random() seed, but reduced the number of possible seeds values that could be chosen in a given time period. This negation of the effects of commit 98c50656c was unintentional. Replace with code that shifts the fast moving timestamp bits left, similar to the original algorithm (though not the previous float-tolerating coding, which is no longer necessary). Author: Thomas Munro Reported-by: Noah Misch Reviewed-by: Tom Lane Discussion: https://postgr.es/m/20181112083358.GA1073796%40rfd.leadboat.com
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/.