9c9782f066
If we're retrying a step, then we already decided it was blocked on a lock, and there's no need to recheck that. The original coding of commit 38f8bdcac4982215beb9f65a19debecaf22fd470 resulted in a large number of is-it-waiting queries when dealing with multiple concurrently-blocked sessions, which is fairly pointless and also results in test failures in CLOBBER_CACHE_ALWAYS builds, where the is-it-waiting query is quite slow. This definition also permits appending pg_sleep() calls to steps where it's needed to control the order of finish of concurrent steps. Before, that did not work nicely because we'd decide that a step performing a sleep was not blocked and hang up waiting for it to finish, rather than noticing the completion of the concurrent step we're supposed to notice first. In passing, revise handling of removal of completed waiting steps to make it a bit less messy.
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. 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/.