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The WAIT_USE_WIN32 implementation of WaitEventSetWait() previously reported at most one event per call, because that's what the underlying WaitForMultipleObjects() call does. We can make the behavior match the three Unix implementations by looping until our output buffer is full, or there are no more events available now. This makes no difference to most callers including the regular FEBE socket code, since they ask for at most one event anyway. A difference in socket accept priority might be perceived by end users after commit 7389aad6 started using WaitEventSet in the postmaster. With this commit, the accept order now matches Unix systems, servicing listening sockets in round-robin order. We decided it wasn't really a bug or worth back-patching, but it seems good to align the behavior across platforms. Reviewed-by: Andres Freund <andres@anarazel.de> (earlier version) Tested-by: "Wei Wang (Fujitsu)" <wangw.fnst@fujitsu.com> Discussion: https://postgr.es/m/CA%2BhUKG%2BA2dk29hr5zRP3HVJQ-_PncNJM6HVQ7aaYLXLRBZU-xw%40mail.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/.