387da18874
This allows to introduce more elaborate handling of interrupts while reading from a socket. Currently some interrupt handlers have to do significant work from inside signal handlers, and it's very hard to correctly write code to do so. Generic signal handler limitations, combined with the fact that we can't safely jump out of a signal handler while reading from the client have prohibited implementation of features like timeouts for idle-in-transaction. Additionally we use the latch code to wait in a couple places where we previously only had waiting code on windows as other platforms just busy looped. This can increase the number of systemcalls happening during FE/BE communication. Benchmarks so far indicate that the impact isn't very high, and there's room for optimization in the latch code. The chance of cleaning up the usage of latches gives us, seem to outweigh the risk of small performance regressions. This commit theoretically can't used without the next patch in the series, as WaitLatchOrSocket is not defined to be fully signal safe. As we already do that in some cases though, it seems better to keep the commits separate, so they're easier to understand. Author: Andres Freund Reviewed-By: Heikki Linnakangas |
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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. 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/.