871dee0ccb
asyncQueueReadAllNotifications() sets our isAdvancing flag and clears it when done. But if we error out in between, for example on a cancel while waiting for a safe snapshot, the flag stays set and SignalBackends() never advances or wakes us again, so the queue tail stops moving. To fix, clear the flag in AtAbort_Notify(). (We need not worry about this in subtransaction abort, since asyncQueueReadAllNotifications() is only called in top-level transactions.) Author: shihao zhong <zhong950419@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CAGRkXqQ1bmVwBw2CXiyZeWWP=XkHPXLPcQ7BSg2Q5JKSvDAnTA@mail.gmail.com Backpatch-through: 19
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.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.