Thomas Munro 44f400fbc6 Fix latch event policy that hid socket events.
If a WaitEventSetWait() caller asks for multiple events, an already set
latch would previously prevent other events from being reported at the
same time.  Now, we'll also poll the kernel for other events that would
fit in the caller's output buffer with a zero wait time.  This policy
change doesn't affect callers that ask for only one event.

The main caller affected is the postmaster.  If its latch is set
extremely frequently by backends launching workers and workers exiting,
we don't want it to handle only those jobs and ignore incoming client
connections.

Back-patch to 16 where the postmaster began using the API.  The
fast-return policy changed here is older than that, but doesn't cause
any known problems in earlier releases.

Reported-by: Nathan Bossart <nathandbossart@gmail.com>
Reviewed-by: Nathan Bossart <nathandbossart@gmail.com>
Discussion: https://postgr.es/m/Z1n5UpAiGDmFcMmd%40nathan
2025-01-20 16:43:39 +13:00
2019-12-18 09:13:13 +01:00
2022-12-04 15:23:00 -05:00
2025-01-01 11:21:54 -05:00
2020-02-10 20:47:50 +01:00

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/17/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/17/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/.

Description
he World's Most Advanced Open Source Relational Database.
Readme 740 MiB
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Perl 4.4%
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