spinlock_pool.hpp

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#ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_POOL_HPP_INCLUDED
#define BOOST_SMART_PTR_DETAIL_SPINLOCK_POOL_HPP_INCLUDED
 
// MS compatible compilers support #pragma once
 
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif
 
//
//  boost/detail/spinlock_pool.hpp
//
//  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)
//
//  spinlock_pool<0> is reserved for atomic<>, when/if it arrives
//  spinlock_pool<1> is reserved for shared_ptr reference counts
//  spinlock_pool<2> is reserved for shared_ptr atomic access
//
 
#include <boost/config.hpp>
#include <boost/smart_ptr/detail/spinlock.hpp>
#include <cstddef>
 
namespace boost
{
 
namespace detail
{
 
template< int M > class spinlock_pool
{
private:
 
    static spinlock pool_[ 41 ];
 
public:
 
    static spinlock & spinlock_for( void const * pv )
    {
#if defined(__VMS) && __INITIAL_POINTER_SIZE == 64  
        std::size_t i = reinterpret_cast< unsigned long long >( pv ) % 41;
#else  
        std::size_t i = reinterpret_cast< std::size_t >( pv ) % 41;
#endif  
        return pool_[ i ];
    }
 
    class scoped_lock
    {
    private:
 
        spinlock & sp_;
 
        scoped_lock( scoped_lock const & );
        scoped_lock & operator=( scoped_lock const & );
 
    public:
 
        explicit scoped_lock( void const * pv ): sp_( spinlock_for( pv ) )
        {
            sp_.lock();
        }
 
        ~scoped_lock()
        {
            sp_.unlock();
        }
    };
};
 
template< int M > spinlock spinlock_pool< M >::pool_[ 41 ] =
{
    BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, 
    BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, 
    BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, 
    BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, 
    BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, 
    BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, 
    BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, 
    BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, 
    BOOST_DETAIL_SPINLOCK_INIT
};
 
} // namespace detail
} // namespace boost
 
#endif // #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_POOL_HPP_INCLUDED