Chris@16: // boost lockfree
Chris@16: //
Chris@16: // Copyright (C) 2011 Tim Blechmann
Chris@16: //
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See
Chris@16: // accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #ifndef BOOST_LOCKFREE_POLICIES_HPP_INCLUDED
Chris@16: #define BOOST_LOCKFREE_POLICIES_HPP_INCLUDED
Chris@16: 
Chris@16: #include <boost/parameter.hpp>
Chris@16: #include <boost/mpl/bool.hpp>
Chris@16: #include <boost/mpl/size_t.hpp>
Chris@16: #include <boost/mpl/void.hpp>
Chris@16: 
Chris@16: namespace boost {
Chris@16: namespace lockfree {
Chris@16: 
Chris@16: #ifndef BOOST_DOXYGEN_INVOKED
Chris@16: namespace tag { struct allocator ; }
Chris@16: namespace tag { struct fixed_sized; }
Chris@16: namespace tag { struct capacity; }
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16: /** Configures a data structure as \b fixed-sized.
Chris@16:  *
Chris@16:  *  The internal nodes are stored inside an array and they are addressed by array indexing. This limits the possible size of the
Chris@16:  *  queue to the number of elements that can be addressed by the index type (usually 2**16-2), but on platforms that lack
Chris@16:  *  double-width compare-and-exchange instructions, this is the best way to achieve lock-freedom.
Chris@16:  *  This implies that a data structure is bounded.
Chris@16:  * */
Chris@16: template <bool IsFixedSized>
Chris@16: struct fixed_sized:
Chris@16:     boost::parameter::template_keyword<tag::fixed_sized, boost::mpl::bool_<IsFixedSized> >
Chris@16: {};
Chris@16: 
Chris@16: /** Sets the \b capacity of a data structure at compile-time.
Chris@16:  *
Chris@16:  * This implies that a data structure is bounded and fixed-sized.
Chris@16:  * */
Chris@16: template <size_t Size>
Chris@16: struct capacity:
Chris@16:     boost::parameter::template_keyword<tag::capacity, boost::mpl::size_t<Size> >
Chris@16: {};
Chris@16: 
Chris@16: /** Defines the \b allocator type of a data structure.
Chris@16:  * */
Chris@16: template <class Alloc>
Chris@16: struct allocator:
Chris@16:     boost::parameter::template_keyword<tag::allocator, Alloc>
Chris@16: {};
Chris@16: 
Chris@16: }
Chris@16: }
Chris@16: 
Chris@16: #endif /* BOOST_LOCKFREE_POLICIES_HPP_INCLUDED */
Chris@16: