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Even if a flag is modified only by the backend owning the transaction, it's not safe to modify it without a lock. Another backend might be setting or clearing a different flag in the flags field concurrently, and that operation might be lost because setting or clearing a bit in a word is not atomic. Make did-write flag a simple backend-private boolean variable, because it was only set or tested in the owning backend (except when committing a prepared transaction, but it's not worthwhile to optimize for the case of a read-only prepared transaction). This also eliminates the need to add locking where that flag is set. Also, set the did-write flag when doing DDL operations like DROP TABLE or TRUNCATE -- that was missed earlier. |
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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/.