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In the admittedly-very-unlikely case that AddWaitEventToSet fails, ConditionVariablePrepareToSleep would error out after already having set cv_sleep_target, which is probably bad, and after having already set cv_wait_event_set, which is very bad. Transaction abort might or might not clean up cv_sleep_target properly; but there is nothing that would be aware that the WaitEventSet wasn't fully constructed, so that all future condition variable sleeps would be broken. We can easily guard against these hazards with slight restructuring. Back-patch to v10 where condition_variable.c was introduced. Discussion: https://postgr.es/m/CAEepm=0NWKehYw7NDoUSf8juuKOPRnCyY3vuaSvhrEWsOTAa3w@mail.gmail.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/.