spinlock_nt.hpp

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#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