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Previously worker_spi used its custom signal handlers for SIGHUP and SIGTERM. This commit makes worker_spi use the standard signal handlers, to simplify the code. Note that die() is used as the standard SIGTERM signal handler in worker_spi instead of SignalHandlerForShutdownRequest() or bgworker_die(). Previously the exit handling was only able to exit from within the main loop, and not from within the backend code it calls. This is why die() needs to be used here, so worker_spi can respond to SIGTERM signal while it's executing a query. Maybe we can say that it's a bug that worker_spi could not respond to SIGTERM during query execution. But since worker_spi is a just example of the background worker code, we don't do the back-patch. Thanks to Craig Ringer for the report and investigation of the issue. Author: Bharath Rupireddy Reviewed-by: Fujii Masao Discussion: https://postgr.es/m/CALj2ACXDEZhAFOTDcqO9cFSRvrFLyYOnPKrcA1UG4uZn9hUAVg@mail.gmail.com Discussion: https://postgr.es/m/CAGRY4nxsAe_1k_9g5b47orA0S011iBoHsXHFMH7cg7HV0O1bwQ@mail.gmail.com
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/.