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163b34fe25
Part of MDEV-5336 Implement LOCK FOR BACKUP The idea is that instead of waiting in close_cached_tables() for all tables to be closed, we instead call flush_tables() that does: - Flush not used objects in table cache to free memory - Collect all tables that are open - Call HA_EXTRA_FLUSH on the objects, to get them into "closed state" - Added HA_EXTRA_FLUSH support to archive and CSV - Added multi-user protection to HA_EXTRA_FLUSH in MyISAM and Aria The benefit compared to old code is: - FTWRL doesn't have to wait for long running read operations or open HANDLER's
86 lines
2.8 KiB
C++
86 lines
2.8 KiB
C++
#ifndef SQL_HANDLER_INCLUDED
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#define SQL_HANDLER_INCLUDED
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/* Copyright (c) 2006, 2015, Oracle and/or its affiliates.
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Copyright (C) 2010, 2015, MariaDB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#ifdef USE_PRAGMA_INTERFACE
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#pragma interface /* gcc class implementation */
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#endif
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#include "sql_class.h" /* enum_ha_read_mode */
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#include "my_base.h" /* ha_rkey_function, ha_rows */
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#include "sql_list.h" /* List */
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/* Open handlers are stored here */
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class SQL_HANDLER {
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public:
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TABLE *table;
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List<Item> fields; /* Fields, set on open */
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THD *thd;
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LEX_CSTRING handler_name;
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LEX_CSTRING db;
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LEX_CSTRING table_name;
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MEM_ROOT mem_root;
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MYSQL_LOCK *lock;
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MDL_request mdl_request;
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key_part_map keypart_map;
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int keyno; /* Used key */
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uint key_len;
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enum enum_ha_read_modes mode;
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/* This is only used when deleting many handler objects */
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SQL_HANDLER *next;
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Query_arena arena;
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char *base_data;
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SQL_HANDLER(THD *thd_arg) :
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thd(thd_arg), arena(&mem_root, Query_arena::STMT_INITIALIZED)
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{ init(); clear_alloc_root(&mem_root); base_data= 0; }
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void init()
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{
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keyno= -1;
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table= 0;
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lock= 0;
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mdl_request.ticket= 0;
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}
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void reset();
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~SQL_HANDLER();
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};
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class THD;
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struct TABLE_LIST;
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bool mysql_ha_open(THD *thd, TABLE_LIST *tables, SQL_HANDLER *reopen);
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bool mysql_ha_close(THD *thd, TABLE_LIST *tables);
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bool mysql_ha_read(THD *, TABLE_LIST *,enum enum_ha_read_modes, const char *,
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List<Item> *,enum ha_rkey_function,Item *,ha_rows,ha_rows);
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void mysql_ha_flush(THD *thd);
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void mysql_ha_flush_tables(THD *thd, TABLE_LIST *all_tables);
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void mysql_ha_rm_tables(THD *thd, TABLE_LIST *tables);
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void mysql_ha_cleanup_no_free(THD *thd);
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void mysql_ha_cleanup(THD *thd);
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void mysql_ha_set_explicit_lock_duration(THD *thd);
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void mysql_ha_rm_temporary_tables(THD *thd);
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SQL_HANDLER *mysql_ha_read_prepare(THD *thd, TABLE_LIST *tables,
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enum enum_ha_read_modes mode,
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const char *keyname,
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List<Item> *key_expr, enum ha_rkey_function ha_rkey_mode,
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Item *cond);
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#endif
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