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/*****************************************************************************
Copyright (c) 1996, 2015, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2017, 2018, MariaDB Corporation.
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 Street, Suite 500, Boston, MA 02110-1335 USA
*****************************************************************************/
/**************************************************//**
@file include/lock0lock.ic
The transaction lock system
Created 5/7/1996 Heikki Tuuri
*******************************************************/
#include "dict0dict.h"
#include "buf0buf.h"
#include "page0page.h"
/*********************************************************************//**
Calculates the fold value of a page file address: used in inserting or
searching for a lock in the hash table.
@return folded value */
UNIV_INLINE
ulint
lock_rec_fold(
/*==========*/
ulint space, /*!< in: space */
ulint page_no)/*!< in: page number */
{
return(ut_fold_ulint_pair(space, page_no));
}
/*********************************************************************//**
Calculates the hash value of a page file address: used in inserting or
searching for a lock in the hash table.
@return hashed value */
UNIV_INLINE
unsigned
lock_rec_hash(
/*==========*/
ulint space, /*!< in: space */
ulint page_no)/*!< in: page number */
{
return(unsigned(hash_calc_hash(lock_rec_fold(space, page_no),
lock_sys.rec_hash)));
}
/*********************************************************************//**
Gets the heap_no of the smallest user record on a page.
@return heap_no of smallest user record, or PAGE_HEAP_NO_SUPREMUM */
UNIV_INLINE
ulint
lock_get_min_heap_no(
/*=================*/
const buf_block_t* block) /*!< in: buffer block */
{
const page_t* page = block->frame;
if (page_is_comp(page)) {
return(rec_get_heap_no_new(
page
+ rec_get_next_offs(page + PAGE_NEW_INFIMUM,
TRUE)));
} else {
return(rec_get_heap_no_old(
page
+ rec_get_next_offs(page + PAGE_OLD_INFIMUM,
FALSE)));
}
}
/*************************************************************//**
Get the lock hash table */
UNIV_INLINE
hash_table_t*
lock_hash_get(
/*==========*/
ulint mode) /*!< in: lock mode */
{
if (mode & LOCK_PREDICATE) {
return(lock_sys.prdt_hash);
} else if (mode & LOCK_PRDT_PAGE) {
return(lock_sys.prdt_page_hash);
} else {
return(lock_sys.rec_hash);
}
}
/*********************************************************************//**
Creates a new record lock and inserts it to the lock queue. Does NOT check
for deadlocks or lock compatibility!
@return created lock */
UNIV_INLINE
lock_t*
lock_rec_create(
/*============*/
#ifdef WITH_WSREP
lock_t* c_lock, /*!< conflicting lock */
que_thr_t* thr, /*!< thread owning trx */
#endif
ulint type_mode,/*!< in: lock mode and wait
flag, type is ignored and
replaced by LOCK_REC */
const buf_block_t* block, /*!< in: buffer block containing
the record */
ulint heap_no,/*!< in: heap number of the record */
dict_index_t* index, /*!< in: index of record */
trx_t* trx, /*!< in,out: transaction */
bool caller_owns_trx_mutex)
/*!< in: TRUE if caller owns
trx mutex */
{
btr_assert_not_corrupted(block, index);
return lock_rec_create_low(
#ifdef WITH_WSREP
c_lock, thr,
#endif
type_mode,
block->page.id.space(), block->page.id.page_no(),
block->frame, heap_no,
index, trx, caller_owns_trx_mutex);
}
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