#ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_NT_HPP_INCLUDED

#define BOOST_SMART_PTR_DETAIL_SPINLOCK_NT_HPP_INCLUDED

// MS compatible compilers support #pragma once

#if defined(_MSC_VER) && (_MSC_VER >= 1020)

# pragma once

#endif

//

//  Copyright (c) 2008 Peter Dimov

//

//  Distributed under the Boost Software License, Version 1.0.

//  See accompanying file LICENSE_1_0.txt or copy at

//  http://www.boost.org/LICENSE_1_0.txt)

//

#include <boost/assert.hpp>

namespace boost

{

namespace detail

{

class spinlock

{

public:

    bool locked_;

public:

    inline bool try_lock()

    {

        if( locked_ )

        {

            return false;

        }

        else

        {

            locked_ = true;

            return true;

        }

    }

    inline void lock()

    {

        BOOST_ASSERT( !locked_ );

        locked_ = true;

    }

    inline void unlock()

    {

        BOOST_ASSERT( locked_ );

        locked_ = false;

    }

public:

    class scoped_lock

    {

    private:

        spinlock & sp_;

        scoped_lock( scoped_lock const & );

        scoped_lock & operator=( scoped_lock const & );

    public:

        explicit scoped_lock( spinlock & sp ): sp_( sp )

        {

            sp.lock();

        }

        ~scoped_lock()

        {

            sp_.unlock();

        }

    };

};

} // namespace detail

} // namespace boost

#define BOOST_DETAIL_SPINLOCK_INIT { false }

#endif // #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_NT_HPP_INCLUDED