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When an autovacuum worker exits, the launcher needs to be notified with SIGUSR2, so that it can rebalance and possibly launch a new worker. The launcher must be notified only after the worker has finished ProcKill(), so that the worker slot is available for a new worker. Before this commit, the autovacuum worker was responsible for that, which required a slightly complicated dance to pass the launcher's PID from FreeWorkerInfo() to ProcKill() in a global variable. Simplify that by moving the responsibility of the signaling to the postmaster. The postmaster was already doing it when it failed to fork a worker process, so it seems logical to make it responsible for notifying the launcher on worker exit too. That's also how the notification on background worker exit is done. Reviewed-by: Nathan Bossart <nathandbossart@gmail.com> Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com> Reviewed-by: li carol <carol.li2025@outlook.com> Discussion: https://www.postgresql.org/message-id/a5e27d25-c7e7-45d5-9bac-a17c8f462def@iki.fi
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/.