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Commit 445dbd82a basically missed the point of commit d46633506, which was that we shouldn't allow shm_toc_lookup() failure to lead to a core dump or assertion crash, because the odds of such a failure should never be considered negligible. It's correct that we can't expect the PARALLEL_KEY_ERROR_QUEUE TOC entry to be there if we have no workers. But if we have no workers, we're not going to do anything in this function with the lookup result anyway, so let's just skip it. That lets the code use the easy-to-prove-safe noError=false case, rather than anything requiring effort to review. Back-patch to v10, like the previous commit. Discussion: https://postgr.es/m/3647.1517601675@sss.pgh.pa.us
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/.