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If the sleep is interrupted by a signal, we must recompute the remaining time to wait; otherwise, a steady stream of non-wait-terminating interrupts could delay return from WaitLatch indefinitely. This has been shown to be a problem for the autovacuum launcher, and there may well be other places now or in the future with similar issues. So we'd better make the function robust, even though this'll add at least one gettimeofday call per wait. Back-patch to 9.2. We might eventually need to fix 9.1 as well, but the code is quite different there, and the usage of WaitLatch in 9.1 is so limited that it's not clearly important to do so. Reported and diagnosed by Jeff Janes, though I rewrote his patch rather heavily. |
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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: 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/.