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74 lines
2.5 KiB
74 lines
2.5 KiB
5 months ago
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/* Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#include "rwlock_scoped_lock.h"
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#include <stddef.h>
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#include "my_compiler.h"
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#include "mysql/psi/mysql_rwlock.h"
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struct mysql_rwlock_t;
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/**
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Acquires lock on specified lock object.
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The lock may be NULL, in which case this is a no-op.
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@param lock Lock object to lock.
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@param lock_for_write Specifies if to lock for write or read.
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@param file File in which lock acquisition is to be presented.
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@param line Line of file in which lock acquisition is to be presented.
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*/
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rwlock_scoped_lock::rwlock_scoped_lock(mysql_rwlock_t *lock,
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bool lock_for_write,
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const char *file MY_ATTRIBUTE((unused)),
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int line MY_ATTRIBUTE((unused)))
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: m_lock(lock) {
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if (lock_for_write) {
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if (!mysql_rwlock_wrlock_with_src(lock, file, line)) {
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m_lock = lock;
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}
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} else {
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if (!mysql_rwlock_rdlock_with_src(lock, file, line)) {
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m_lock = lock;
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}
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}
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}
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/**
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Moves lock from another object.
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@param lock Scoped lock object to move from.
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*/
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rwlock_scoped_lock::rwlock_scoped_lock(rwlock_scoped_lock &&lock)
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: m_lock(lock.m_lock) {
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lock.m_lock = NULL;
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}
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rwlock_scoped_lock::~rwlock_scoped_lock() {
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/* If lock is NULL, then lock was set to remain locked when going out of
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scope or was moved to other object. */
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if (m_lock != NULL) {
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mysql_rwlock_unlock(m_lock);
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}
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}
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