MySQL 8.4.3
Source Code Documentation
lock.h
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1/* Copyright (c) 2010, 2024, Oracle and/or its affiliates.
2
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5 as published by the Free Software Foundation.
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12 separately licensed software that they have either included with
13 the program or referenced in the documentation.
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15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License, version 2.0, for more details.
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20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
23
24#ifndef LOCK_INCLUDED
25#define LOCK_INCLUDED
26
27#include <stddef.h>
28#include <sys/types.h>
29#include <string>
30
31#include "map_helpers.h"
32#include "sql/mdl.h"
33
34class THD;
35// Forward declarations
36struct TABLE;
37struct THR_LOCK_DATA;
38
39struct MYSQL_LOCK {
43};
44
46 uint flags);
47void mysql_unlock_tables(THD *thd, MYSQL_LOCK *sql_lock);
48void mysql_unlock_read_tables(THD *thd, MYSQL_LOCK *sql_lock);
49void mysql_unlock_some_tables(THD *thd, TABLE **table, uint count);
50void mysql_lock_remove(THD *thd, MYSQL_LOCK *locked, TABLE *table);
53/* Lock based on name */
54bool lock_schema_name(THD *thd, const char *db);
55
56// Hash set to hold set of tablespace names.
58
59// Lock tablespace names.
60bool lock_tablespace_names(THD *thd, Tablespace_hash_set *tablespace_set,
61 ulong lock_wait_timeout, MEM_ROOT *mem_root);
62
63/* Lock based on stored routine name */
65 const char *db, const char *name);
66
67/* Acquire protection against the global read lock. */
68bool acquire_shared_global_read_lock(THD *thd, unsigned long lock_wait_timeout);
69
70#endif /* LOCK_INCLUDED */
For each client connection we create a separate thread with THD serving as a thread/connection descri...
Definition: sql_lexer_thd.h:36
std::unordered_set, but with my_malloc, so that you can track the memory used using PSI memory keys.
Definition: map_helpers.h:177
static MEM_ROOT mem_root
Definition: client_plugin.cc:114
void mysql_unlock_read_tables(THD *thd, MYSQL_LOCK *sql_lock)
unlock all tables locked for read.
Definition: lock.cc:435
void mysql_unlock_tables(THD *thd, MYSQL_LOCK *sql_lock)
Definition: lock.cc:410
bool acquire_shared_global_read_lock(THD *thd, unsigned long lock_wait_timeout)
Acquire protection against the global read lock.
Definition: lock.cc:1011
MYSQL_LOCK * mysql_lock_merge(MYSQL_LOCK *a, MYSQL_LOCK *b)
Definition: lock.cc:567
bool lock_object_name(THD *thd, MDL_key::enum_mdl_namespace mdl_type, const char *db, const char *name)
Obtain an exclusive metadata lock on an object name.
Definition: lock.cc:847
MYSQL_LOCK * mysql_lock_tables(THD *thd, TABLE **table, size_t count, uint flags)
Lock tables.
Definition: lock.cc:316
bool lock_schema_name(THD *thd, const char *db)
Obtain an exclusive metadata lock on a schema name.
Definition: lock.cc:739
bool lock_tablespace_names(THD *thd, Tablespace_hash_set *tablespace_set, ulong lock_wait_timeout, MEM_ROOT *mem_root)
Acquire IX MDL lock each tablespace name from the given set.
Definition: lock.cc:795
void mysql_lock_abort_for_thread(THD *thd, TABLE *table)
Abort one thread / table combination.
Definition: lock.cc:554
void mysql_lock_remove(THD *thd, MYSQL_LOCK *locked, TABLE *table)
Try to find the table in the list of locked tables.
Definition: lock.cc:492
void mysql_unlock_some_tables(THD *thd, TABLE **table, uint count)
Unlock some of the tables locked by mysql_lock_tables.
Definition: lock.cc:425
static int flags[50]
Definition: hp_test1.cc:40
malloc_unordered_set< std::string > Tablespace_hash_set
Definition: lock.h:57
static int count
Definition: myisam_ftdump.cc:45
static PFS_engine_table_share_proxy table
Definition: pfs.cc:61
case opt name
Definition: sslopt-case.h:29
enum_mdl_namespace
Object namespaces.
Definition: mdl.h:400
The MEM_ROOT is a simple arena, where allocations are carved out of larger blocks.
Definition: my_alloc.h:83
Definition: lock.h:39
THR_LOCK_DATA ** locks
Definition: lock.h:42
uint table_count
Definition: lock.h:41
TABLE ** table
Definition: lock.h:40
uint lock_count
Definition: lock.h:41
Definition: table.h:1406
Definition: thr_lock.h:124