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b7f9c89423
Following variables do not require LOCK_open protection anymore: - table_def_cache (renamed to tdc_hash) is protected by rw-lock LOCK_tdc_hash; - table_def_shutdown_in_progress doesn't need LOCK_open protection; - last_table_id use atomics; - TABLE_SHARE::ref_count (renamed to TABLE_SHARE::tdc.ref_count) is protected by TABLE_SHARE::tdc.LOCK_table_share; - TABLE_SHARE::next, ::prev (renamed to tdc.next and tdc.prev), oldest_unused_share, end_of_unused_share are protected by LOCK_unused_shares; - TABLE_SHARE::m_flush_tickets (renamed to tdc.m_flush_tickets) is protected by TABLE_SHARE::tdc.LOCK_table_share; - refresh_version (renamed to tdc_version) use atomics.
134 lines
4.6 KiB
C++
134 lines
4.6 KiB
C++
/* Copyright (c) 2000, 2012, Oracle and/or its affiliates.
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Copyright (c) 2010, 2011 Monty Program Ab
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Copyright (C) 2013 Sergey Vojtovich and MariaDB Foundation
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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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enum enum_tdc_remove_table_type
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{
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TDC_RT_REMOVE_ALL,
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TDC_RT_REMOVE_NOT_OWN,
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TDC_RT_REMOVE_UNUSED,
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TDC_RT_REMOVE_NOT_OWN_KEEP_SHARE
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};
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extern ulong tdc_size;
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extern ulong tc_size;
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extern TABLE *unused_tables; /* FIXME: make private */
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extern mysql_mutex_t LOCK_open; /* FIXME: make private */
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extern int tdc_init(void);
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extern void tdc_start_shutdown(void);
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extern void tdc_deinit(void);
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extern ulong tdc_records(void);
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extern void tdc_purge(bool all);
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extern void tdc_init_share(TABLE_SHARE *share);
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extern void tdc_deinit_share(TABLE_SHARE *share);
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extern TABLE_SHARE *tdc_lock_share(const char *db, const char *table_name);
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extern void tdc_unlock_share(TABLE_SHARE *share);
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extern TABLE_SHARE *tdc_acquire_share(THD *thd, const char *db,
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const char *table_name,
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const char *key, uint key_length,
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uint flags, TABLE **out_table);
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extern void tdc_release_share(TABLE_SHARE *share);
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extern bool tdc_remove_table(THD *thd, enum_tdc_remove_table_type remove_type,
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const char *db, const char *table_name,
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bool kill_delayed_threads);
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extern int tdc_wait_for_old_version(THD *thd, const char *db,
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const char *table_name,
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ulong wait_timeout, uint deadlock_weight);
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extern ulong tdc_refresh_version(void);
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extern void tdc_increment_refresh_version(void);
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extern void tdc_assign_new_table_id(TABLE_SHARE *share);
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extern uint tc_records(void);
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extern void tc_purge(void);
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extern void tc_add_table(THD *thd, TABLE *table);
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extern bool tc_release_table(TABLE *table);
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/**
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Create a table cache key for non-temporary table.
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@param key Buffer for key (must be at least NAME_LEN*2+2 bytes).
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@param db Database name.
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@param table_name Table name.
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@return Length of key.
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*/
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inline uint tdc_create_key(char *key, const char *db, const char *table_name)
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{
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/*
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In theory caller should ensure that both db and table_name are
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not longer than NAME_LEN bytes. In practice we play safe to avoid
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buffer overruns.
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*/
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return (uint) (strmake(strmake(key, db, NAME_LEN) + 1, table_name,
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NAME_LEN) - key + 1);
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}
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/**
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Convenience helper: call tdc_acquire_share() without out_table.
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*/
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static inline TABLE_SHARE *tdc_acquire_share(THD *thd, const char *db,
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const char *table_name,
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const char *key,
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uint key_length, uint flags)
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{
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return tdc_acquire_share(thd, db, table_name, key, key_length, flags, 0);
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}
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/**
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Convenience helper: call tdc_acquire_share() without precomputed cache key.
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*/
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static inline TABLE_SHARE *tdc_acquire_share(THD *thd, const char *db,
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const char *table_name, uint flags)
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{
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char key[MAX_DBKEY_LENGTH];
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uint key_length;
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key_length= tdc_create_key(key, db, table_name);
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return tdc_acquire_share(thd, db, table_name, key, key_length, flags);
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}
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/**
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Convenience helper: call tdc_acquire_share() reusing the MDL cache key.
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@note lifetime of the returned TABLE_SHARE is limited by the
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lifetime of the TABLE_LIST object!!!
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*/
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uint get_table_def_key(const TABLE_LIST *table_list, const char **key);
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static inline TABLE_SHARE *tdc_acquire_share_shortlived(THD *thd, TABLE_LIST *tl,
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uint flags)
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{
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const char *key;
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uint key_length= get_table_def_key(tl, &key);
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return tdc_acquire_share(thd, tl->db, tl->table_name, key, key_length, flags);
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}
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class TDC_iterator
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{
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ulong idx;
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public:
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void init(void);
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void deinit(void);
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TABLE_SHARE *next(void);
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};
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