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When sending queries in pipeline mode, we were careless about leaving the connection in the right state so that PQgetResult would behave correctly; trying to read further results after sending a query after having read a result with an error would sometimes hang. Fix by ensuring internal libpq state is changed properly. All the state changes were being done by the callers of pqAppendCmdQueueEntry(); it would have become too repetitious to have this logic in each of them, so instead put it all in that function and relieve callers of the responsibility. Add a test to verify this case. Without the code fix, this new test hangs sometimes. Also, document that PQisBusy() would return false when no queries are pending result. This is not intuitively obvious, and NULL would be obtained by calling PQgetResult() at that point, which is confusing. Wording by Boris Kolpackov. In passing, fix bogus use of "false" to mean "0", per Ranier Vilela. Backpatch to 14. Author: Álvaro Herrera <alvherre@alvh.no-ip.org> Reported-by: Boris Kolpackov <boris@codesynthesis.com> Discussion: https://postgr.es/m/boris.20210624103805@codesynthesis.com |
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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/.