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libpgcommon is a new static library to allow sharing code among the various frontend programs and backend; this lets us eliminate duplicate implementations of common routines. We avoid libpgport, because that's intended as a place for porting issues; per discussion, it seems better to keep them separate. The first use case, and the only implemented by this patch, is pg_malloc and friends, which many frontend programs were already using. At the same time, we can use this to provide palloc emulation functions for the frontend; this way, some palloc-using files in the backend can also be used by the frontend cleanly. To do this, we change palloc() in the backend to be a function instead of a macro on top of MemoryContextAlloc(). This was previously believed to cause loss of performance, but this implementation has been tweaked by Tom and Andres so that on modern compilers it provides a slight improvement over the previous one. This lets us clean up some places that were already with localized hacks. Most of the pg_malloc/palloc changes in this patch were authored by Andres Freund. Zoltán Böszörményi also independently provided a form of that. libpgcommon infrastructure was authored by Álvaro. |
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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. Changes between all PostgreSQL releases are recorded in the file HISTORY. 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/.