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124 lines
3.9 KiB
C
124 lines
3.9 KiB
C
/*****************************************************************************
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Copyright (c) 2007, 2016, Oracle and/or its affiliates. All Rights Reserved.
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Copyright (c) 2015, MariaDB Corporation
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA
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*****************************************************************************/
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/**************************************************//**
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@file include/lock0priv.h
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Lock module internal structures and methods.
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Created July 12, 2007 Vasil Dimov
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*******************************************************/
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#ifndef lock0priv_h
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#define lock0priv_h
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#ifndef LOCK_MODULE_IMPLEMENTATION
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/* If you need to access members of the structures defined in this
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file, please write appropriate functions that retrieve them and put
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those functions in lock/ */
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#error Do not include lock0priv.h outside of the lock/ module
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#endif
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#include "univ.i"
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#include "dict0types.h"
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#include "hash0hash.h"
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#include "trx0types.h"
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#include "ut0lst.h"
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/** A table lock */
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struct lock_table_t {
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dict_table_t* table; /*!< database table in dictionary
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cache */
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UT_LIST_NODE_T(lock_t)
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locks; /*!< list of locks on the same
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table */
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};
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/** Record lock for a page */
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struct lock_rec_t {
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ulint space; /*!< space id */
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ulint page_no; /*!< page number */
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ulint n_bits; /*!< number of bits in the lock
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bitmap; NOTE: the lock bitmap is
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placed immediately after the
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lock struct */
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};
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/** Lock struct; protected by lock_sys->mutex */
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struct lock_t {
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trx_t* trx; /*!< transaction owning the
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lock */
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UT_LIST_NODE_T(lock_t)
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trx_locks; /*!< list of the locks of the
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transaction */
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ulint type_mode; /*!< lock type, mode, LOCK_GAP or
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LOCK_REC_NOT_GAP,
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LOCK_INSERT_INTENTION,
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wait flag, ORed */
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hash_node_t hash; /*!< hash chain node for a record
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lock */
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dict_index_t* index; /*!< index for a record lock */
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/* Statistics for how long lock has been held and time
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how long this lock had to be waited before it was granted */
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time_t requested_time; /*!< Lock request time */
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ulint wait_time; /*!< Time waited this lock or 0 */
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union {
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lock_table_t tab_lock;/*!< table lock */
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lock_rec_t rec_lock;/*!< record lock */
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} un_member; /*!< lock details */
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};
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/*********************************************************************//**
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Gets the type of a lock.
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@return LOCK_TABLE or LOCK_REC */
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UNIV_INLINE
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ulint
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lock_get_type_low(
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/*==============*/
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const lock_t* lock); /*!< in: lock */
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/*********************************************************************//**
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Gets the previous record lock set on a record.
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@return previous lock on the same record, NULL if none exists */
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UNIV_INTERN
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const lock_t*
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lock_rec_get_prev(
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/*==============*/
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const lock_t* in_lock,/*!< in: record lock */
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ulint heap_no);/*!< in: heap number of the record */
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/*********************************************************************//**
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Checks if some transaction has an implicit x-lock on a record in a clustered
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index.
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@return transaction id of the transaction which has the x-lock, or 0 */
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UNIV_INLINE
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trx_id_t
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lock_clust_rec_some_has_impl(
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/*=========================*/
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const rec_t* rec, /*!< in: user record */
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const dict_index_t* index, /*!< in: clustered index */
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const ulint* offsets)/*!< in: rec_get_offsets(rec, index) */
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MY_ATTRIBUTE((nonnull, warn_unused_result));
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#ifndef UNIV_NONINL
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#include "lock0priv.ic"
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#endif
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#endif /* lock0priv_h */
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