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The exclusion of SIGALRM dates back to Berkeley days, when Postgres used SIGALRM in only one very short stretch of code. Nowadays, allowing it to interrupt kernel calls doesn't seem like a very good idea, since its use for statement_timeout means SIGALRM could occur anyplace in the code, and there are far too many call sites where we aren't prepared to deal with EINTR failures. When third-party code is taken into consideration, it seems impossible that we ever could be fully EINTR-proof, so better to use SA_RESTART always and deal with the implications of that. One such implication is that we should not assume pg_usleep() will be terminated early by a signal. Therefore, long sleeps should probably be replaced by WaitLatch operations where practical. Back-patch to 9.3 so we can get some beta testing on this change. |
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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/.