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121 lines
3.5 KiB
Text
121 lines
3.5 KiB
Text
/*****************************************************************************
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Copyright (c) 1996, 2009, Innobase Oy. All Rights Reserved.
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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., 59 Temple
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Place, Suite 330, Boston, MA 02111-1307 USA
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*****************************************************************************/
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/**************************************************//**
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@file include/lock0lock.ic
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The transaction lock system
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Created 5/7/1996 Heikki Tuuri
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*******************************************************/
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#include "sync0sync.h"
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#include "srv0srv.h"
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#include "dict0dict.h"
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#include "row0row.h"
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#include "trx0sys.h"
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#include "trx0trx.h"
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#include "buf0buf.h"
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#include "page0page.h"
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#include "page0cur.h"
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#include "row0vers.h"
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#include "que0que.h"
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#include "btr0cur.h"
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#include "read0read.h"
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#include "log0recv.h"
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/*********************************************************************//**
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Calculates the fold value of a page file address: used in inserting or
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searching for a lock in the hash table.
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@return folded value */
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UNIV_INLINE
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ulint
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lock_rec_fold(
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/*==========*/
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ulint space, /*!< in: space */
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ulint page_no)/*!< in: page number */
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{
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return(ut_fold_ulint_pair(space, page_no));
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}
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/*********************************************************************//**
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Calculates the hash value of a page file address: used in inserting or
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searching for a lock in the hash table.
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@return hashed value */
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UNIV_INLINE
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ulint
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lock_rec_hash(
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/*==========*/
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ulint space, /*!< in: space */
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ulint page_no)/*!< in: page number */
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{
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return(hash_calc_hash(lock_rec_fold(space, page_no),
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lock_sys->rec_hash));
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}
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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 which has the x-lock, or NULL */
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UNIV_INLINE
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trx_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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dict_index_t* index, /*!< in: clustered index */
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const ulint* offsets)/*!< in: rec_get_offsets(rec, index) */
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{
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trx_id_t trx_id;
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ut_ad(mutex_own(&kernel_mutex));
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ut_ad(dict_index_is_clust(index));
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ut_ad(page_rec_is_user_rec(rec));
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trx_id = row_get_rec_trx_id(rec, index, offsets);
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if (trx_is_active(trx_id)) {
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/* The modifying or inserting transaction is active */
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return(trx_get_on_id(trx_id));
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}
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return(NULL);
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}
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/*********************************************************************//**
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Gets the heap_no of the smallest user record on a page.
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@return heap_no of smallest user record, or PAGE_HEAP_NO_SUPREMUM */
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UNIV_INLINE
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ulint
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lock_get_min_heap_no(
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/*=================*/
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const buf_block_t* block) /*!< in: buffer block */
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{
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const page_t* page = block->frame;
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if (page_is_comp(page)) {
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return(rec_get_heap_no_new(
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page
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+ rec_get_next_offs(page + PAGE_NEW_INFIMUM,
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TRUE)));
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} else {
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return(rec_get_heap_no_old(
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page
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+ rec_get_next_offs(page + PAGE_OLD_INFIMUM,
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FALSE)));
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}
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}
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