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during the regression test. The problem has been reproduced on two machine but both of these are the same type of hardware and software. I also tried to recreate the problem on other machines, on older version of AIX but I couldn't. After looked through pgsql-hackers mailing list, I focused on spin lock issue to solve the problem. The easiest and may not be the best solution for the problem is to give up HAS_TEST_AND_SET. This actually works. One another and better solution for the problem is to use _check_lock() and _clear_lock() as spin lock. Important thing here is to define S_UNLOCK() with _clear_lock(). This will solve the so called "Compiler bug" issue someone wrote on the mailing list. We have some other API such as cs(), compare_and_swap() and fetch_and_or() to do test and set on AIX, but any of these didn't solve my problem. I wrote tiny testing program to see if we have any bug of these API of AIX, but I couldn't see any problem except for compare_and_swap(). It seems that you can not use compare_and_swap() for the purpose, as it would not work as spin lock on any SMP machines I tested. I don't know the reason why cs() nor fetch_and_or()/fetch_and_and() will not work with PostgreSQL on p690. These worked with my testing program on all machines I tested. Tomoyuki Niijima |
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| config | ||
| contrib | ||
| doc | ||
| src | ||
| COPYRIGHT | ||
| GNUmakefile.in | ||
| HISTORY | ||
| INSTALL | ||
| Makefile | ||
| README | ||
| aclocal.m4 | ||
| configure | ||
| configure.in | ||
| register.txt | ||
README
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 several language bindings, including C, Perl, Python, and Tcl, as well as drivers for JDBC. As of v7.3, the ODBC and C++ interfaces have been moved over to the PostgreSQL Projects WebSite @ http://gborg.postgresql.org. 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 ftp://ftp.postgresql.org/pub/. For more information look at our web site located at http://www.postgresql.org/.