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24d9664ad0
'version' variables. The warnings occur on Windows build, yet they are also are valid on 32bit Unix. Fix is to consistently use 64bit integer on all platforms.
125 lines
4.2 KiB
C
125 lines
4.2 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 02110-1301 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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typedef int64 tdc_version_t;
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#define TDC_VERSION_MAX INT_MAX64
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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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tdc_version_t version;
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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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};
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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 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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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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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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tdc_version_t refresh_version= TDC_VERSION_MAX);
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extern tdc_version_t tdc_refresh_version(void);
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extern tdc_version_t tdc_increment_refresh_version(void);
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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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extern void tc_purge(bool mark_flushed= false);
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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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/**
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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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