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shm_mq_sendv sends a message to the queue assembled from multiple locations. This is expected to be used by forthcoming patches to allow frontend/backend protocol messages to be sent via shm_mq, but might be useful for other purposes as well. shm_mq_set_handle associates a BackgroundWorkerHandle with an already-existing shm_mq_handle. This solves a timing problem when creating a shm_mq to communicate with a newly-launched background worker: if you attach to the queue first, and the background worker fails to start, you might block forever trying to do I/O on the queue; but if you start the background worker first, but then die before attaching to the queue, the background worrker might block forever trying to do I/O on the queue. This lets you attach before starting the worker (so that the worker is protected) and then associate the BackgroundWorkerHandle later (so that you are also protected). Patch by me, reviewed by Stephen Frost.
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/.