mirror of
https://github.com/postgres/postgres.git
synced 2025-05-01 01:04:50 +03:00
d20eec82a0
This prevents a possible longjmp out of the signal handler if a timeout or SIGINT occurs while something within the handler has transiently set ImmediateInterruptOK. For safety we must hold off the timeout or cancel error until we're back in mainline, or at least till we reach the end of the signal handler when ImmediateInterruptOK was true at entry. This syncs these functions with the logic now present in handle_sig_alarm. AFAICT there is no live bug here in 9.0 and up, because I don't think we currently can wait for any heavyweight lock inside these functions, and there is no other code (except read-from-client) that will turn on ImmediateInterruptOK. However, that was not true pre-9.0: in older branches ProcessIncomingNotify might block trying to lock pg_listener, and then a SIGINT could lead to undesirable control flow. It might be all right anyway given the relatively narrow code ranges in which NOTIFY interrupts are enabled, but for safety's sake I'm back-patching this.
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: http://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. Changes between all PostgreSQL releases are recorded in the file HISTORY. 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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.