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These are functions where a lot of things happen between the ResourceOwnerEnlarge and ResourceOwnerRemember calls. It's important that there are no unrelated ResourceOwnerRemember calls in the code in between, otherwise the reserved entry might be used up by the intervening ResourceOwnerRemember and not be available at the intended ResourceOwnerRemember call anymore. I don't see any bugs here, but the longer the code path between the calls is, the harder it is to verify. In bufmgr.c, there is a function similar to ResourceOwnerEnlarge, ReservePrivateRefCountEntry(), to ensure that the private refcount array has enough space. The ReservePrivateRefCountEntry() calls were made at different places than the ResourceOwnerEnlargeBuffers() calls. Move the ResourceOwnerEnlargeBuffers() and ReservePrivateRefCountEntry() calls together for consistency. Reviewed-by: Aleksander Alekseev, Michael Paquier, Julien Rouhaud Reviewed-by: Kyotaro Horiguchi, Hayato Kuroda, Álvaro Herrera, Zhihong Yu Reviewed-by: Peter Eisentraut, Andres Freund Discussion: https://www.postgresql.org/message-id/cbfabeb0-cd3c-e951-a572-19b365ed314d%40iki.fi |
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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/.