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3b4ac33254
Invent separate macros for "invalid" values of these types, so that we needn't embed knowledge of their representations into calling code. These are all zeroes anyway ATM, so this is not fixing any live bug, but it makes the code cleaner and more future-proof. I (tgl) also chose to move DSM_HANDLE_INVALID into dsm_impl.h, since it seems like it should live beside the typedef for dsm_handle. Hou Zhijie, Nathan Bossart, Kyotaro Horiguchi, Tom Lane Discussion: https://postgr.es/m/OS0PR01MB5716860B1454C34E5B179B6694C99@OS0PR01MB5716.jpnprd01.prod.outlook.com |
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| README.git | ||
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/.