smart_ptr/detail/spinlock_pool.hpp

0001 #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_POOL_HPP_INCLUDED
0002 #define BOOST_SMART_PTR_DETAIL_SPINLOCK_POOL_HPP_INCLUDED
0003
0004 // MS compatible compilers support #pragma once
0005
0006 #if defined(_MSC_VER) && (_MSC_VER >= 1020)
0007 # pragma once
0008 #endif
0009
0010 //
0011 //  boost/detail/spinlock_pool.hpp
0012 //
0013 //  Copyright (c) 2008 Peter Dimov
0014 //
0015 //  Distributed under the Boost Software License, Version 1.0.
0016 //  See accompanying file LICENSE_1_0.txt or copy at
0017 //  http://www.boost.org/LICENSE_1_0.txt)
0018 //
0019 //  spinlock_pool<0> is reserved for atomic<>, when/if it arrives
0020 //  spinlock_pool<1> is reserved for shared_ptr reference counts
0021 //  spinlock_pool<2> is reserved for shared_ptr atomic access
0022 //
0023
0024 #include <boost/config.hpp>
0025 #include <boost/smart_ptr/detail/spinlock.hpp>
0026 #include <cstddef>
0027
0028 namespace boost
0029 {
0030
0031 namespace detail
0032 {
0033
0034 template< int M > class spinlock_pool
0035 {
0036 private:
0037
0038     static spinlock pool_[ 41 ];
0039
0040 public:
0041
0042     static spinlock & spinlock_for( void const * pv )
0043     {
0044 #if defined(__VMS) && __INITIAL_POINTER_SIZE == 64
0045         std::size_t i = reinterpret_cast< unsigned long long >( pv ) % 41;
0046 #else
0047         std::size_t i = reinterpret_cast< std::size_t >( pv ) % 41;
0048 #endif
0049         return pool_[ i ];
0050     }
0051
0052     class scoped_lock
0053     {
0054     private:
0055
0056         spinlock & sp_;
0057
0058         scoped_lock( scoped_lock const & );
0059         scoped_lock & operator=( scoped_lock const & );
0060
0061     public:
0062
0063         explicit scoped_lock( void const * pv ): sp_( spinlock_for( pv ) )
0064         {
0065             sp_.lock();
0066         }
0067
0068         ~scoped_lock()
0069         {
0070             sp_.unlock();
0071         }
0072     };
0073 };
0074
0075 template< int M > spinlock spinlock_pool< M >::pool_[ 41 ] =
0076 {
0077     BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT,
0078     BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT,
0079     BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT,
0080     BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT,
0081     BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT,
0082     BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT,
0083     BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT,
0084     BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT,
0085     BOOST_DETAIL_SPINLOCK_INIT
0086 };
0087
0088 } // namespace detail
0089 } // namespace boost
0090
0091 #endif // #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_POOL_HPP_INCLUDED