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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/service_context.h"
#include "mongo/util/background.h"
#include "mongo/util/concurrency/mutex.h"
namespace mongo {
/**
* Maintains a global read lock while mongod is fsyncLocked.
*/
class FSyncLockThread : public BackgroundJob {
public:
FSyncLockThread(ServiceContext* serviceContext, bool allowFsyncFailure)
: BackgroundJob(false),
_serviceContext(serviceContext),
_allowFsyncFailure(allowFsyncFailure) {}
std::string name() const override {
return "FSyncLockThread";
}
void run() override;
/**
* Releases the fsync lock for shutdown.
*/
void shutdown(stdx::unique_lock<Latch>& lk);
private:
ServiceContext* const _serviceContext;
bool _allowFsyncFailure;
};
/**
* Allows holders to block on an active fsyncLock.
*/
extern SimpleMutex filesLockedFsync;
/**
* Must be taken before accessing globalFsyncLockThread below.
*/
extern Mutex fsyncStateMutex;
/**
* The FSyncLockThread must be external available for interruption during shutdown.
* Must lock the 'fsyncStateMutex' before accessing.
*
* TODO (SERVER-76131): consider whether this should decorate the service context.
*/
extern std::unique_ptr<FSyncLockThread> globalFsyncLockThread;
} // namespace mongo
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