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Until now, the first putenv() call of a given postgres.exe process would cache the set of loaded CRTs. If a CRT unloaded after that call, the next putenv() would crash. That risk was largely theoretical, because the first putenv() precedes all PostgreSQL-initiated module loading. However, this might explain bad interactions with antivirus and other software that injects threads asynchronously. If an additional CRT loaded after the first putenv(), pgwin32_putenv() would not discover it. That CRT would have all environment changes predating its load, but it would not receive later PostgreSQL-initiated changes. An additional CRT loading concurrently with the first putenv() might miss that change in addition to missing later changes. Fix all those problems. This removes the cache mechanism from pgwin32_putenv(); the cost, less than 100 μs per backend startup, is negligible. No resulting misbehavior was known to be user-visible given the core distribution alone, but one can readily construct an affected extension module. No back-patch given the lack of complaints and the potential for behavior changes in non-PostgreSQL code running in the backend. Christian Ullrich, reviewed by Michael Paquier.
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/.