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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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/operation_context.h"
namespace mongo {
/**
* GlobalLockAcquisitionTracker keeps track of the global lock modes acquired during the
* operation's lifetime. This class is used to track if we ever did a transaction with the
* intent to do a write, so that we can enforce write concern on noop writes. Also, used
* during step down to kill all user operations except those that acquired global lock in
* IS mode.
*/
class GlobalLockAcquisitionTracker {
public:
static const OperationContext::Decoration<GlobalLockAcquisitionTracker> get;
// Decoration requires a default constructor.
GlobalLockAcquisitionTracker() = default;
/**
* Returns whether we have ever taken a global lock in X or IX mode in this operation.
*/
bool getGlobalWriteLocked() const;
/**
* Returns whether we have ever taken a global lock in S mode in this operation.
*/
bool getGlobalSharedLockTaken() const;
/**
* Sets the mode bit in _globalLockMode. Once a mode bit is set, we won't clear it.
*/
void setGlobalLockModeBit(LockMode mode);
private:
// keeps track of the global lock modes acquired for this operation.
unsigned char _globalLockMode = (1 << MODE_NONE);
};
} // namespace mongo
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