/*
  Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License, version 2.0,
  as published by the Free Software Foundation.

  This program is also distributed with certain software (including
  but not limited to OpenSSL) that is licensed under separate terms,
  as designated in a particular file or component or in included license
  documentation.  The authors of MySQL hereby grant you an additional
  permission to link the program and your derivative works with the
  separately licensed software that they have included with MySQL.

  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, version 2.0, 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 St, Fifth Floor, Boston, MA 02110-1301  USA
*/

#ifndef ATOMIC_INCLUDED
#define ATOMIC_INCLUDED

#include "my_global.h"
#include "my_atomic.h"

namespace my_boost{

template<typename TType> class atomic
{
public:
  atomic()
  {}
  atomic(const TType& value)
  {
    this->store(value);
  }
  TType load() const
  {
    return (TType)my_atomic_load64((volatile int64*)&m_value);
  }
  void store(TType value)
  {
    my_atomic_store64(&m_value, value);
  }
  bool compare_exchange_strong(TType& expected, TType destination)
  {
    int64 u64_expected= expected;
    bool res= my_atomic_cas64(&m_value, &u64_expected, destination);
    expected= u64_expected;
    return res;
  }

  TType operator ++()
  {
    return *this += 1;
  }

  TType operator ++(int)
  {
    return (TType)my_atomic_add64(&m_value, 1);
  }

  TType operator --()
  {
    return *this -= 1;
  }

  TType operator --(int)
  {
    return my_atomic_add64(&m_value, -1);
  }

  TType operator +=(TType value)
  {
    return my_atomic_add64(&m_value, value) + value;
  }

  TType operator -=(TType value)
  {
    return this->fetch_sub(value) - value;
  }

  TType fetch_sub(TType value)
  {
    return (TType)my_atomic_add64(&m_value, -(signed)value);
  }

  operator TType() const
  {
    return this->load();
  }

  void join();

private:
  volatile int64 m_value;
};

typedef atomic<uint32> atomic_uint32_t;
typedef atomic<int64> atomic_int64_t;
typedef atomic<uint64> atomic_uint64_t;
typedef atomic<bool> atomic_bool;

}

#endif
