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92 lines
2.9 KiB
92 lines
2.9 KiB
3 years ago
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#ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_POOL_HPP_INCLUDED
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#define BOOST_SMART_PTR_DETAIL_SPINLOCK_POOL_HPP_INCLUDED
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// MS compatible compilers support #pragma once
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#if defined(_MSC_VER) && (_MSC_VER >= 1020)
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# pragma once
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#endif
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//
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// boost/detail/spinlock_pool.hpp
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//
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// Copyright (c) 2008 Peter Dimov
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//
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// Distributed under the Boost Software License, Version 1.0.
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// See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// spinlock_pool<0> is reserved for atomic<>, when/if it arrives
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// spinlock_pool<1> is reserved for shared_ptr reference counts
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// spinlock_pool<2> is reserved for shared_ptr atomic access
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//
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#include <boost/config.hpp>
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#include <boost/smart_ptr/detail/spinlock.hpp>
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#include <cstddef>
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namespace boost
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{
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namespace detail
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{
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template< int M > class spinlock_pool
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{
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private:
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static spinlock pool_[ 41 ];
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public:
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static spinlock & spinlock_for( void const * pv )
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{
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#if defined(__VMS) && __INITIAL_POINTER_SIZE == 64
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std::size_t i = reinterpret_cast< unsigned long long >( pv ) % 41;
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#else
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std::size_t i = reinterpret_cast< std::size_t >( pv ) % 41;
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#endif
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return pool_[ i ];
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}
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class scoped_lock
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{
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private:
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spinlock & sp_;
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scoped_lock( scoped_lock const & );
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scoped_lock & operator=( scoped_lock const & );
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public:
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explicit scoped_lock( void const * pv ): sp_( spinlock_for( pv ) )
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{
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sp_.lock();
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}
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~scoped_lock()
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{
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sp_.unlock();
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}
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};
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};
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template< int M > spinlock spinlock_pool< M >::pool_[ 41 ] =
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{
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BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT,
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BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT,
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BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT,
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BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT,
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BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT,
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BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT,
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BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT,
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BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT, BOOST_DETAIL_SPINLOCK_INIT,
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BOOST_DETAIL_SPINLOCK_INIT
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};
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} // namespace detail
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} // namespace boost
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#endif // #ifndef BOOST_SMART_PTR_DETAIL_SPINLOCK_POOL_HPP_INCLUDED
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