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Split up CHECK_FOR_INTERRUPTS() to provide an additional macro INTERRUPTS_PENDING_CONDITION(), which just tests whether an interrupt is pending without attempting to service it. This is useful in situations where the caller knows that interrupts are blocked, and would like to find out if it's worth the trouble to unblock them. Also add INTERRUPTS_CAN_BE_PROCESSED(), which indicates whether CHECK_FOR_INTERRUPTS() can be relied on to clear the pending interrupt. This commit doesn't actually add any uses of the new macros, but a follow-on bug fix will do so. Back-patch to all supported branches to provide infrastructure for that fix. Alvaro Herrera and Tom Lane Discussion: https://postgr.es/m/20210513155351.GA7848@alvherre.pgsql
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/.