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Previously, a flag was set to indicate that a lock release should wake up waiters. Since waking waiters is the default behavior in the majority of cases, this logic has been inverted. The new LW_FLAG_WAKE_IN_PROGRESS flag is now set iff wakeups are explicitly inhibited. The motivation for this change is that in an upcoming commit, content locks will be implemented independently of lwlocks, with the lock state stored as part of BufferDesc.state. As all of a buffer's flags are cleared when the buffer is invalidated, without this change we would have to re-add the RELEASE_OK flag after clearing the flags; otherwise, the next lock release would not wake waiters. It seems good to keep the implementation of lwlocks and buffer content locks as similar as reasonably possible. Reviewed-by: Melanie Plageman <melanieplageman@gmail.com> Discussion: https://postgr.es/m/4csodkvvfbfloxxjlkgsnl2lgfv2mtzdl7phqzd4jxjadxm4o5@usw7feyb5bzf
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.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.