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We don't actually need a lock to set PGPROC->statusFlags itself; what we do need is a shared lock on either XidGenLock or ProcArrayLock in order to ensure MyProc->pgxactoff keeps still while we modify the mirror array in ProcGlobal->statusFlags. Some places were using an exclusive lock for that, which is excessive. Relax those to use shared lock only. procarray.c has a couple of places with somewhat brittle assumptions about PGPROC changes: ProcArrayEndTransaction uses only shared lock, so it's permissible to change MyProc only. On the other hand, ProcArrayEndTransactionInternal also changes other procs, so it must hold exclusive lock. Add asserts to ensure those assumptions continue to hold. Author: Álvaro Herrera <alvherre@alvh.no-ip.org> Reviewed-by: Michael Paquier <michael@paquier.xyz> Discussion: https://postgr.es/m/20201117155501.GA13805@alvherre.pgsql |
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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: 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/.