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If we do not reset the FD_READ event, WaitForMultipleObjects won't return it again again unless we've meanwhile read from the socket, which is generally true but not guaranteed. WaitEventSetWaitBlock itself may fail to return the event to the caller if the latch is also set, and even if we changed that, the caller isn't obliged to handle all returned events at once. On non-Windows systems, the socket-read event is purely level-triggered, so this issue does not exist. To fix, make Windows reset the event when needed. This bug was introduced by 98a64d0bd713cb89e61bef6432befc4b7b5da59e, and causes hangs when trying to use the pldebugger extension. Patch by Amit Kapial. Reported and tested by Ashutosh Sharma, who also provided some analysis. Further analysis by Michael Paquier.
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. 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/.