// Copyright 2019-2020 CERN and copyright holders of ALICE O2.

// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.

// All rights not expressly granted are reserved.

//

// This software is distributed under the terms of the GNU General Public

// License v3 (GPL Version 3), copied verbatim in the file "COPYING".

//

// In applying this license CERN does not waive the privileges and immunities

// granted to it by virtue of its status as an Intergovernmental Organization

// or submit itself to any jurisdiction.

/// \file stdspinlock.h

/// \author David Rohr

#ifndef Q_STDSPINLOCK_H

#define Q_STDSPINLOCK_H

#include <atomic>

class stdspinlock

{

public:

stdspinlock(std::atomic_flag& flag) : mFlag(&flag)

{

while (flag.test_and_set(std::memory_order_acquire)) {

}

}

void release()

{

if (mFlag) {

mFlag->clear(std::memory_order_release);

mFlag = nullptr;

}

}

~stdspinlock()

{

release();

}

private:

std::atomic_flag* mFlag;

};

#endif // Q_STDSPINLOCK_H