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In some corner cases, a new datachecksums worker could be launched while an old one was still running. If you're really unlucky, the old worker could set the worker_result in shared memory and mislead the launcher to think that a newer worker invocation completed successfully, even though it failed for some reason. That's highly unlikely to happen in practice as it requires several race conditions with workers and launchers starting, failing and succeeding and at the right moments. Nevertheless, better to tighten it up. To distinguish different worker invocations, assign a unique 'worker_invocation' number every time a new worker is launched. In the worker, check that the invocation number matches before setting the worker result. This ensures that the result always belongs to the latest invocation. Reviewed-by: Daniel Gustafsson <daniel@yesql.se> Discussion: https://www.postgresql.org/message-id/b283fbb9-298e-4953-9120-eefaf24fae20@iki.fi |
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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.
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/.