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Until now dblink and postgres_fdw did not process interrupts during connection establishment. Besides preventing query cancellations etc, this can lead to undetected deadlocks, as global barriers are not processed. These aforementioned undetected deadlocks are the reason for the spate of CI test failures in the FreeBSD 'test_running' step. Fix the bug by using the helper from libpq-be-fe-helpers.h, introduced in a prior commit. Besides fixing the bug, this also removes duplicated code around reserving file descriptors. As the change is relatively large and there are no field reports of the problem, don't backpatch for now. Reviewed-by: Thomas Munro <thomas.munro@gmail.com> Discussion: https://postgr.es/m/20220925232237.p6uskba2dw6fnwj2@awork3.anarazel.de Backpatch:
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. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.