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