ThreadNumberLimiter.h

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// -*- mode: c++; c-file-style: "linux"; c-basic-offset: 2; indent-tabs-mode: nil -*-
//
//  Copyright (C) 2004-2015 Andrej Vodopivec <andrej.vodopivec@gmail.com>
//  Copyright (C) 2017-2018 Gunter Königsmann <wxMaxima@physikbuch.de>
//
//  This program is free software; you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation; either version 2 of the License, 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.
//
//
//  You should have received a copy of the GNU General Public License
//  along with this program; if not, write to the Free Software
//  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
//
//  SPDX-License-Identifier: GPL-2.0+
 
#ifndef THREADNUMBERLIMITER_H
#define THREADNUMBERLIMITER_H
 
#include <mutex>
#include <atomic>
#include <condition_variable>
 
class ThreadNumberLimiter
{
public:
  explicit ThreadNumberLimiter();
  virtual ~ThreadNumberLimiter();
private:
  static std::atomic<int> m_numberOfBackgroundThreads;
  static std::mutex m_mutex;
  static std::condition_variable m_block;
};
 
#endif // THREADNUMBERLIMITER_H