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C doesn't have any sort of built-in understanding of a pointer relative to some arbitrary base address, but dynamic shared memory segments can be mapped at different addresses in different processes, so any sort of shared data structure stored within a dynamic shared memory segment can't use absolute pointers. We could use something like Size to represent a relative pointer, but then the compiler provides no type-checking. Use stupid macro tricks to get some type-checking. Patch originally by me. Concept suggested by Andres Freund. Recently resubmitted as part of Thomas Munro's work on dynamic shared memory allocation. Discussion: 20131205144434.GG12398@alap2.anarazel.de Discussion: CAEepm=1z5WLuNoJ80PaCvz6EtG9dN0j-KuHcHtU6QEfcPP5-qA@mail.gmail.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: 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/.