atomic_counter.h

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/*
 * Copyright (C) 2010 Tim Mayberry <mojofunk@gmail.com>
 * Copyright (C) 2013-2015 Paul Davis <paul@linuxaudiosystems.com>
 *
 * 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.
 */
 
#ifndef PBD_ATOMIC_COUNTER_H
#define PBD_ATOMIC_COUNTER_H
 
#include <atomic>
 
#include <glib.h>
 
namespace PBD {
 
class atomic_counter
{
        atomic_counter (const atomic_counter&);
        atomic_counter& operator= (const atomic_counter&);
 
public:
 
        atomic_counter (gint value = 0)
        {
                m_value.store (value);
        }
 
        gint get() const
        {
                return m_value.load ();
        }
 
        void set (gint new_value)
        {
                m_value.store (new_value);
        }
 
        void increment ()
        {
                m_value.fetch_add (1);
        }
 
        void operator++ ()
        {
                increment ();
        }
 
        bool decrement_and_test ()
        {
                return PBD::atomic_dec_and_test (m_value);
        }
 
        bool operator-- ()
        {
                return decrement_and_test ();
        }
 
        bool compare_and_exchange (gint old_value, gint new_value)
        {
                return m_value.compare_exchange_strong (old_value, new_value);
        }
 
        bool cas (gint old_value, gint new_value)
        {
                return compare_and_exchange (old_value, new_value);
        }
 
private:
        mutable std::atomic<int> m_value;
};
 
} // namespace PBD
 
#endif // PBD_ATOMIC_COUNTER_H