ee97eef695
Currently, currentWorker and workersFinished are ints protected by a spinlock. By converting them to atomic variables, we can remove the spinlock. Note that the spinlock also covered the write of each worker's tape metadata. Removing it is still okay: each worker writes only its own slot, and the atomic increment that follows is a full barrier. Furthermore, the leader doesn't read the slot values until all workers have finished. Reviewed-by: Zsolt Parragi <zsolt.parragi@percona.com> Tested-by: solai v <solai.cdac@gmail.com> Discussion: https://postgr.es/m/alAJeRRzehDjLaF1%40nathan
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/.