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/**
* Copyright (C) 2018 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include "mongo/db/concurrency/lock_manager.h"
namespace mongo {
/**
* This friend class to the LockManager extends LockManager functionality to enable behaviors
* required for replication state transitions, which must atomically release the global X lock and
* restore locks for prepared transactions into their individual Lockers.
*/
class ReplicationLockManagerManipulator {
MONGO_DISALLOW_COPYING(ReplicationLockManagerManipulator);
public:
explicit ReplicationLockManagerManipulator(LockManager* lockManager);
~ReplicationLockManagerManipulator() = default;
/**
* Works like LockManager::lock() except that it only works for the Global lock and rather than
* looking up the true LockHead for the global resource ID, it puts the LockRequest into the
* given TemporaryResourceQueue, which is guaranteed not to have any conflicting locks for the
* given request.
*/
void lockUncontestedTemporaryGlobalResource(
LockManager::TemporaryResourceQueue* tempGlobalResource,
LockRequest* request,
LockMode mode);
/**
* Takes the locks from a given TemporaryResourceQueue for the Global resource and moves them
* into the true LockHead for the global resource, atomically releasing the global X lock from
* the true LockHead for the global resource in the process.
*/
void replaceGlobalLocksWithLocksFromTemporaryGlobalResource(
ResourceId resId, LockManager::TemporaryResourceQueue* tempGlobalResource);
private:
LockManager* _lockManager;
};
} // namespace mongo
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