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MariaDB server is a community developed fork of MySQL server. Started by core members of the original MySQL team, MariaDB actively works with outside developers to deliver the most featureful, stable, and sanely licensed open SQL server in the industry.
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These test can sporadically show mutex deadlock warnings between LOCK_wsrep_thd and LOCK_thd_data mutexes. This means that these mutexes can be locked in opposite order by different threads, and thus result in deadlock situation. To fix such issue, the locking policy of these mutexes should be revised and enforced to be uniform. However, a quick code review shows that the number of lock/unlock operations for these mutexes combined is between 100-200, and all these mutex invocations should be checked/fixed. On the other hand, it turns out that LOCK_wsrep_thd is used for protecting access to wsrep variables of THD (wsrep_conflict_state, wsrep_query_state), whereas LOCK_thd_data protects query, db and mysys_var variables in THD. Extending LOCK_thd_data to protect also wsrep variables looks like a viable solution, as there should not be a use case where separate threads need simultaneous access to wsrep variables and THD data variables. In this commit LOCK_wsrep_thd mutex is refactored to be replaced by LOCK_thd_data. By bluntly replacing LOCK_wsrep_thd by LOCK_thd_data, will result in double locking of LOCK_thd_data, and some adjustements have been performed to fix such situations. |
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| BUILD | ||
| client | ||
| cmake | ||
| dbug | ||
| debian | ||
| Docs | ||
| extra | ||
| include | ||
| libmysql | ||
| libmysqld | ||
| libservices | ||
| man | ||
| mysql-test | ||
| mysys | ||
| mysys_ssl | ||
| pcre | ||
| plugin | ||
| randgen/conf | ||
| scripts | ||
| sql | ||
| sql-bench | ||
| sql-common | ||
| storage | ||
| strings | ||
| support-files | ||
| tests | ||
| unittest | ||
| vio | ||
| win | ||
| wsrep | ||
| zlib | ||
| .gitattributes | ||
| .gitignore | ||
| BUILD-CMAKE | ||
| CMakeLists.txt | ||
| config.h.cmake | ||
| configure.cmake | ||
| COPYING | ||
| COPYING.thirdparty | ||
| CREDITS | ||
| EXCEPTIONS-CLIENT | ||
| INSTALL-SOURCE | ||
| INSTALL-WIN-SOURCE | ||
| KNOWN_BUGS.txt | ||
| README | ||
| VERSION | ||
MariaDB is designed as a drop-in replacement of MySQL(R) with more features, new storage engines, fewer bugs, and better performance. MariaDB is brought to you by the MariaDB Foundation. Please read the CREDITS file for details about the MariaDB Foundation, and who is developing MariaDB. MariaDB is developed by many of the original developers of MySQL who now work for the MariadB Foundation and the MariaDB Corporation, and by many people in the community. MySQL, which is the base of MariaDB, is a product and trademark of Oracle Corporation, Inc. For a list of developers and other contributors, see the Credits appendix. You can also run 'SHOW authors' to get a list of active contributors. A description of the MariaDB project and a manual can be found at: http://mariadb.org/ https://mariadb.com/kb/en/ https://mariadb.com/kb/en/mariadb-vs-mysql-features/ https://mariadb.com/kb/en/mariadb-versus-mysql-features/ https://mariadb.com/kb/en/mariadb-versus-mysql-compatibility/ As MariaDB is a full replacement of MySQL, the MySQL manual at http://dev.mysql.com/doc is generally applicable. More help is available from the Maria Discuss mailing list https://launchpad.net/~maria-discuss and the #maria IRC channel on Freenode. *************************************************************************** NOTE: MariaDB is specifically available only under version 2 of the GNU General Public License (GPLv2). (I.e. Without the "any later version" clause.) This is inherited from MySQL. Please see the README file in the MySQL distribution for more information. License information can be found in the COPYING, COPYING.LESSER, and COPYING.thirdparty files. *************************************************************************** IMPORTANT: Bug and/or error reports regarding MariaDB should be submitted at http://mariadb.org/jira Bugs in the MySQL code can also be submitted at http://bugs.mysql.com The code for MariaDB, including all revision history, can be found at: https://github.com/MariaDB/server ***************************************************************************