/*
 * @project      The CERN Tape Archive (CTA)
 * @copyright    Copyright © 2021-2022 CERN
 * @license      This program is free software, distributed under the terms of the GNU General Public
 *               Licence version 3 (GPL Version 3), copied verbatim in the file "COPYING". You can
 *               redistribute it and/or modify it under the terms of the GPL Version 3, or (at your
 *               option) any later version.
 *
 *               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 General Public License for more details.
 *
 *               In applying this licence, 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.
 */


#pragma once

#include "common/threading/MutexLocker.hpp"
#include "common/threading/Thread.hpp"

namespace cta::threading {

// A one-way flag: once set, it cannot be reset
struct AtomicFlag {
  AtomicFlag() : m_set(false) {};
  void set() {
    MutexLocker ml(m_mutex);
    m_set = true;
  }
  operator bool() const {
    MutexLocker ml(m_mutex);
    return m_set;
  }
private:
  bool m_set;
  mutable Mutex m_mutex;
};

} // namespace cta::threading