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In commit 5c77690f6, we added polling in front of most of the get_slot_xmins calls in 001_stream_rep.pl, but today's results from buildfarm member nightjar show that at least one more poll loop is needed. Proactively add a poll loop before the next-to-last get_slot_xmins call as well. It may be that there is no race condition there because the standby_2 server is shut down at that point, but I'm quite tired of fighting with this test script. The empirical evidence that it's safe, from the buildfarm, is no stronger than the evidence for the other call that nightjar just proved unsafe. The only remaining get_slot_xmins calls without wait_slot_xmins protection are the first two, which should be OK since nothing has happened at that point. It's tempting to ignore that special case and merge get_slot_xmins and wait_slot_xmins into a single function. I didn't go that far though. Discussion: https://postgr.es/m/18436.1502228036@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/.