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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 18:07:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 18:07:14 +0000
commita175314c3e5827eb193872241446f2f8f5c9d33c (patch)
treecd3d60ca99ae00829c52a6ca79150a5b6e62528b /sql/table_cache.h
parentInitial commit. (diff)
downloadmariadb-10.5-upstream.tar.xz
mariadb-10.5-upstream.zip
Adding upstream version 1:10.5.12.upstream/1%10.5.12upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--sql/table_cache.h117
1 files changed, 117 insertions, 0 deletions
diff --git a/sql/table_cache.h b/sql/table_cache.h
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+#ifndef TABLE_CACHE_H_INCLUDED
+#define TABLE_CACHE_H_INCLUDED
+/* Copyright (c) 2000, 2012, Oracle and/or its affiliates.
+ Copyright (c) 2010, 2011 Monty Program Ab
+ Copyright (C) 2013 Sergey Vojtovich and MariaDB Foundation
+
+ 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
+ the Free Software Foundation; version 2 of the License.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
+
+
+struct Share_free_tables
+{
+ typedef I_P_List <TABLE, TABLE_share> List;
+ List list;
+ /** Avoid false sharing between instances */
+ char pad[CPU_LEVEL1_DCACHE_LINESIZE];
+};
+
+
+struct TDC_element
+{
+ uchar m_key[NAME_LEN + 1 + NAME_LEN + 1];
+ uint m_key_length;
+ bool flushed;
+ TABLE_SHARE *share;
+
+ /**
+ Protects ref_count, m_flush_tickets, all_tables, flushed, all_tables_refs.
+ */
+ mysql_mutex_t LOCK_table_share;
+ mysql_cond_t COND_release;
+ TDC_element *next, **prev; /* Link to unused shares */
+ uint ref_count; /* How many TABLE objects uses this */
+ uint all_tables_refs; /* Number of refs to all_tables */
+ /**
+ List of tickets representing threads waiting for the share to be flushed.
+ */
+ Wait_for_flush_list m_flush_tickets;
+ /*
+ Doubly-linked (back-linked) lists of used and unused TABLE objects
+ for this share.
+ */
+ All_share_tables_list all_tables;
+ /** Avoid false sharing between TDC_element and free_tables */
+ char pad[CPU_LEVEL1_DCACHE_LINESIZE];
+ Share_free_tables free_tables[1];
+
+ inline void wait_for_refs(uint my_refs);
+ void flush(THD *thd, bool mark_flushed);
+ void flush_unused(bool mark_flushed);
+};
+
+
+extern ulong tdc_size;
+extern ulong tc_size;
+extern uint32 tc_instances;
+
+extern bool tdc_init(void);
+extern void tdc_start_shutdown(void);
+extern void tdc_deinit(void);
+extern ulong tdc_records(void);
+extern void tdc_purge(bool all);
+extern TDC_element *tdc_lock_share(THD *thd, const char *db,
+ const char *table_name);
+extern void tdc_unlock_share(TDC_element *element);
+int tdc_share_is_cached(THD *thd, const char *db, const char *table_name);
+extern TABLE_SHARE *tdc_acquire_share(THD *thd, TABLE_LIST *tl, uint flags,
+ TABLE **out_table= 0);
+extern void tdc_release_share(TABLE_SHARE *share);
+void tdc_remove_referenced_share(THD *thd, TABLE_SHARE *share);
+void tdc_remove_table(THD *thd, const char *db, const char *table_name);
+
+extern int tdc_wait_for_old_version(THD *thd, const char *db,
+ const char *table_name,
+ ulong wait_timeout, uint deadlock_weight);
+extern int tdc_iterate(THD *thd, my_hash_walk_action action, void *argument,
+ bool no_dups= false);
+
+extern uint tc_records(void);
+int show_tc_active_instances(THD *thd, SHOW_VAR *var, char *buff,
+ enum enum_var_type scope);
+extern void tc_purge();
+extern void tc_add_table(THD *thd, TABLE *table);
+extern void tc_release_table(TABLE *table);
+extern TABLE *tc_acquire_table(THD *thd, TDC_element *element);
+
+/**
+ Create a table cache key for non-temporary table.
+
+ @param key Buffer for key (must be at least NAME_LEN*2+2 bytes).
+ @param db Database name.
+ @param table_name Table name.
+
+ @return Length of key.
+*/
+
+inline uint tdc_create_key(char *key, const char *db, const char *table_name)
+{
+ /*
+ In theory caller should ensure that both db and table_name are
+ not longer than NAME_LEN bytes. In practice we play safe to avoid
+ buffer overruns.
+ */
+ return (uint) (strmake(strmake(key, db, NAME_LEN) + 1, table_name,
+ NAME_LEN) - key + 1);
+}
+#endif /* TABLE_CACHE_H_INCLUDED */