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117 lines
4.1 KiB
C
117 lines
4.1 KiB
C
#ifndef TABLE_CACHE_H_INCLUDED
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#define TABLE_CACHE_H_INCLUDED
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/* 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 02110-1335 USA */
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struct Share_free_tables
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{
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typedef I_P_List <TABLE, TABLE_share> List;
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List list;
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/** Avoid false sharing between instances */
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char pad[CPU_LEVEL1_DCACHE_LINESIZE];
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};
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struct TDC_element
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{
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uchar m_key[NAME_LEN + 1 + NAME_LEN + 1];
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uint m_key_length;
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bool flushed;
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TABLE_SHARE *share;
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/**
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Protects ref_count, m_flush_tickets, all_tables, flushed, all_tables_refs.
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*/
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mysql_mutex_t LOCK_table_share;
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mysql_cond_t COND_release;
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TDC_element *next, **prev; /* Link to unused shares */
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uint ref_count; /* How many TABLE objects uses this */
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uint all_tables_refs; /* Number of refs to all_tables */
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/**
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List of tickets representing threads waiting for the share to be flushed.
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*/
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Wait_for_flush_list m_flush_tickets;
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/*
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Doubly-linked (back-linked) lists of used and unused TABLE objects
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for this share.
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*/
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All_share_tables_list all_tables;
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/** Avoid false sharing between TDC_element and free_tables */
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char pad[CPU_LEVEL1_DCACHE_LINESIZE];
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Share_free_tables free_tables[1];
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inline void wait_for_refs(uint my_refs);
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void flush(THD *thd, bool mark_flushed);
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void flush_unused(bool mark_flushed);
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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 uint32 tc_instances;
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extern bool 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 TDC_element *tdc_lock_share(THD *thd, const char *db,
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const char *table_name);
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extern void tdc_unlock_share(TDC_element *element);
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int tdc_share_is_cached(THD *thd, const char *db, const char *table_name);
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extern TABLE_SHARE *tdc_acquire_share(THD *thd, TABLE_LIST *tl, uint flags,
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TABLE **out_table= 0);
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extern void tdc_release_share(TABLE_SHARE *share);
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void tdc_remove_referenced_share(THD *thd, TABLE_SHARE *share);
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void tdc_remove_table(THD *thd, const char *db, const char *table_name);
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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 int tdc_iterate(THD *thd, my_hash_walk_action action, void *argument,
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bool no_dups= false);
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extern uint tc_records(void);
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int show_tc_active_instances(THD *thd, SHOW_VAR *var, void *buff,
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system_status_var *, enum enum_var_type scope);
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extern void tc_purge();
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extern void tc_add_table(THD *thd, TABLE *table);
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extern void tc_release_table(TABLE *table);
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extern TABLE *tc_acquire_table(THD *thd, TDC_element *element);
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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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#endif /* TABLE_CACHE_H_INCLUDED */
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