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/*****************************************************************************
Copyright (c) 2007, 2014, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2018, 2022, 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, Fifth Floor, Boston, MA 02110-1335 USA
*****************************************************************************/
/**************************************************//**
@file include/lock0priv.ic
Lock module internal inline methods.
Created July 16, 2007 Vasil Dimov
*******************************************************/
/* This file contains only methods which are used in
lock/lock0* files, other than lock/lock0lock.cc.
I.e. lock/lock0lock.cc contains more internal inline
methods but they are used only in that file. */
#ifndef LOCK_MODULE_IMPLEMENTATION
#error Do not include lock0priv.ic outside of the lock/ module
#endif
#include "row0row.h"
/*********************************************************************//**
Checks if some transaction has an implicit x-lock on a record in a clustered
index.
@return transaction id of the transaction which has the x-lock, or 0 */
UNIV_INLINE
trx_id_t
lock_clust_rec_some_has_impl(
/*=========================*/
const rec_t* rec, /*!< in: user record */
const dict_index_t* index, /*!< in: clustered index */
const rec_offs* offsets)/*!< in: rec_get_offsets(rec, index) */
{
ut_ad(dict_index_is_clust(index));
ut_ad(page_rec_is_user_rec(rec));
return(row_get_rec_trx_id(rec, index, offsets));
}
/*********************************************************************//**
Gets the number of bits in a record lock bitmap.
@return number of bits */
UNIV_INLINE
ulint
lock_rec_get_n_bits(
/*================*/
const lock_t* lock) /*!< in: record lock */
{
return(lock->un_member.rec_lock.n_bits);
}
/**********************************************************************//**
Sets the nth bit of a record lock to TRUE. */
inline
void
lock_rec_set_nth_bit(
/*=================*/
lock_t* lock, /*!< in: record lock */
ulint i) /*!< in: index of the bit */
{
ulint byte_index;
ulint bit_index;
ut_ad(!lock->is_table());
ut_ad(i < lock->un_member.rec_lock.n_bits);
byte_index = i / 8;
bit_index = i % 8;
#if defined __GNUC__ && !defined __clang__ && __GNUC__ < 6
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wconversion" /* GCC 4 and 5 need this here */
#endif
((byte*) &lock[1])[byte_index] |= static_cast<byte>(1 << bit_index);
#if defined __GNUC__ && !defined __clang__ && __GNUC__ < 6
# pragma GCC diagnostic pop
#endif
#ifdef SUX_LOCK_GENERIC
ut_ad(lock_sys.is_writer() || lock->trx->mutex_is_owner());
#else
ut_ad(lock_sys.is_writer() || lock->trx->mutex_is_owner()
|| (xtest() && !lock->trx->mutex_is_locked()));
#endif
lock->trx->lock.n_rec_locks++;
}
/*********************************************************************//**
Gets the first or next record lock on a page.
@return next lock, NULL if none exists */
UNIV_INLINE
lock_t*
lock_rec_get_next_on_page(
/*======================*/
lock_t* lock) /*!< in: a record lock */
{
return const_cast<lock_t*>(lock_rec_get_next_on_page_const(lock));
}
/*********************************************************************//**
Gets the next explicit lock request on a record.
@return next lock, NULL if none exists or if heap_no == ULINT_UNDEFINED */
UNIV_INLINE
lock_t*
lock_rec_get_next(
/*==============*/
ulint heap_no,/*!< in: heap number of the record */
lock_t* lock) /*!< in: lock */
{
do {
lock = lock_rec_get_next_on_page(lock);
} while (lock && !lock_rec_get_nth_bit(lock, heap_no));
return(lock);
}
/*********************************************************************//**
Gets the next explicit lock request on a record.
@return next lock, NULL if none exists or if heap_no == ULINT_UNDEFINED */
UNIV_INLINE
const lock_t*
lock_rec_get_next_const(
/*====================*/
ulint heap_no,/*!< in: heap number of the record */
const lock_t* lock) /*!< in: lock */
{
return lock_rec_get_next(heap_no, const_cast<lock_t*>(lock));
}
/*********************************************************************//**
Gets the nth bit of a record lock.
@return TRUE if bit set also if i == ULINT_UNDEFINED return FALSE*/
UNIV_INLINE
ibool
lock_rec_get_nth_bit(
/*=================*/
const lock_t* lock, /*!< in: record lock */
ulint i) /*!< in: index of the bit */
{
const byte* b;
ut_ad(!lock->is_table());
if (i >= lock->un_member.rec_lock.n_bits) {
return(FALSE);
}
b = ((const byte*) &lock[1]) + (i / 8);
return(1 & *b >> (i % 8));
}
/*********************************************************************//**
Gets the first or next record lock on a page.
@return next lock, NULL if none exists */
UNIV_INLINE
const lock_t*
lock_rec_get_next_on_page_const(
/*============================*/
const lock_t* lock) /*!< in: a record lock */
{
ut_ad(!lock->is_table());
const page_id_t page_id{lock->un_member.rec_lock.page_id};
while (!!(lock= static_cast<const lock_t*>(HASH_GET_NEXT(hash, lock))))
if (lock->un_member.rec_lock.page_id == page_id)
break;
return lock;
}
/*********************************************************************//**
Calculates if lock mode 1 is compatible with lock mode 2.
@return nonzero if mode1 compatible with mode2 */
UNIV_INLINE
ulint
lock_mode_compatible(
/*=================*/
enum lock_mode mode1, /*!< in: lock mode */
enum lock_mode mode2) /*!< in: lock mode */
{
ut_ad((ulint) mode1 < lock_types);
ut_ad((ulint) mode2 < lock_types);
return(lock_compatibility_matrix[mode1][mode2]);
}
/*********************************************************************//**
Calculates if lock mode 1 is stronger or equal to lock mode 2.
@return nonzero if mode1 stronger or equal to mode2 */
UNIV_INLINE
ulint
lock_mode_stronger_or_eq(
/*=====================*/
enum lock_mode mode1, /*!< in: lock mode */
enum lock_mode mode2) /*!< in: lock mode */
{
ut_ad((ulint) mode1 < lock_types);
ut_ad((ulint) mode2 < lock_types);
return(lock_strength_matrix[mode1][mode2]);
}
/*********************************************************************//**
Checks if a transaction has the specified table lock, or stronger. This
function should only be called by the thread that owns the transaction.
@return lock or NULL */
UNIV_INLINE
const lock_t*
lock_table_has(
/*===========*/
const trx_t* trx, /*!< in: transaction */
const dict_table_t* table, /*!< in: table */
lock_mode in_mode)/*!< in: lock mode */
{
/* Look for stronger locks the same trx already has on the table */
for (lock_list::const_iterator it = trx->lock.table_locks.begin(),
end = trx->lock.table_locks.end(); it != end; ++it) {
const lock_t* lock = *it;
if (lock == NULL) {
continue;
}
ut_ad(trx == lock->trx);
ut_ad(lock->is_table());
ut_ad(lock->un_member.tab_lock.table);
if (table == lock->un_member.tab_lock.table
&& lock_mode_stronger_or_eq(lock->mode(), in_mode)) {
ut_ad(!lock->is_waiting());
return(lock);
}
}
return(NULL);
}
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