diff options
Diffstat (limited to 'sql/handler.h')
| -rw-r--r-- | sql/handler.h | 55 |
1 files changed, 52 insertions, 3 deletions
diff --git a/sql/handler.h b/sql/handler.h index 6d43c56edbf..711cc823f96 100644 --- a/sql/handler.h +++ b/sql/handler.h @@ -1,7 +1,7 @@ #ifndef HANDLER_INCLUDED #define HANDLER_INCLUDED -/* Copyright 2000-2008 MySQL AB, 2008 Sun Microsystems, Inc. +/* Copyright 2000-2008 MySQL AB, 2008-2009 Sun Microsystems, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -16,7 +16,6 @@ along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ - /* Definitions for parameters to do with handler-routines */ #ifdef USE_PRAGMA_INTERFACE @@ -305,6 +304,8 @@ enum legacy_db_type DB_TYPE_MEMCACHE, DB_TYPE_FALCON, DB_TYPE_MARIA, + /** Performance schema engine. */ + DB_TYPE_PERFORMANCE_SCHEMA, DB_TYPE_FIRST_DYNAMIC=42, DB_TYPE_DEFAULT=127 // Must be last }; @@ -1216,6 +1217,20 @@ public: */ uint auto_inc_intervals_count; + /** + Instrumented table associated with this handler. + This member should be set to NULL when no instrumentation is in place, + so that linking an instrumented/non instrumented server/plugin works. + For example: + - the server is compiled with the instrumentation. + The server expects either NULL or valid pointers in m_psi. + - an engine plugin is compiled without instrumentation. + The plugin can not leave this pointer uninitialized, + or can not leave a trash value on purpose in this pointer, + as this would crash the server. + */ + PSI_table *m_psi; + handler(handlerton *ht_arg, TABLE_SHARE *share_arg) :table_share(share_arg), table(0), estimation_rows_to_insert(0), ht(ht_arg), @@ -1224,7 +1239,8 @@ public: ft_handler(0), inited(NONE), locked(FALSE), implicit_emptied(0), pushed_cond(0), next_insert_id(0), insert_id_for_cur_row(0), - auto_inc_intervals_count(0) + auto_inc_intervals_count(0), + m_psi(NULL) {} virtual ~handler(void) { @@ -1825,6 +1841,39 @@ protected: THD *ha_thd(void) const; /** + Acquire the instrumented table information from a table share. + @param share a table share + @return an instrumented table share, or NULL. + */ + PSI_table_share *ha_table_share_psi(const TABLE_SHARE *share) const; + + inline void psi_open() + { + DBUG_ASSERT(m_psi == NULL); + DBUG_ASSERT(table_share != NULL); +#ifdef HAVE_PSI_INTERFACE + if (PSI_server) + { + PSI_table_share *share_psi= ha_table_share_psi(table_share); + if (share_psi) + m_psi= PSI_server->open_table(share_psi, this); + } +#endif + } + + inline void psi_close() + { +#ifdef HAVE_PSI_INTERFACE + if (PSI_server && m_psi) + { + PSI_server->close_table(m_psi); + m_psi= NULL; /* instrumentation handle, invalid after close_table() */ + } +#endif + DBUG_ASSERT(m_psi == NULL); + } + + /** Default rename_table() and delete_table() rename/delete files with a given name and extensions from bas_ext(). |