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The latch infrastructure is now capable of detecting all cases where the walsender loop needs to wake up, so there is no reason to have an arbitrary timeout. Also, modify the walsender loop logic to follow the standard pattern of ResetLatch, test for work to do, WaitLatch. The previous coding was both hard to follow and buggy: it would sometimes busy-loop despite having nothing available to do, eg between receipt of a signal and the next time it was caught up with new WAL, and it also had interesting choices like deciding to update to WALSNDSTATE_STREAMING on the strength of information known to be obsolete. |
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README.git |
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: http://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. Changes between all PostgreSQL releases are recorded in the file HISTORY. 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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.