diff options
Diffstat (limited to 'boost/lockfree/policies.hpp')
-rw-r--r-- | boost/lockfree/policies.hpp | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/boost/lockfree/policies.hpp b/boost/lockfree/policies.hpp new file mode 100644 index 0000000000..cec9b57f89 --- /dev/null +++ b/boost/lockfree/policies.hpp @@ -0,0 +1,59 @@ +// boost lockfree +// +// Copyright (C) 2011 Tim Blechmann +// +// 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) + +#ifndef BOOST_LOCKFREE_POLICIES_HPP_INCLUDED +#define BOOST_LOCKFREE_POLICIES_HPP_INCLUDED + +#include <boost/parameter.hpp> +#include <boost/mpl/bool.hpp> +#include <boost/mpl/size_t.hpp> +#include <boost/mpl/void.hpp> + +namespace boost { +namespace lockfree { + +#ifndef BOOST_DOXYGEN_INVOKED +namespace tag { struct allocator ; } +namespace tag { struct fixed_sized; } +namespace tag { struct capacity; } + +#endif + +/** Configures a data structure as \b fixed-sized. + * + * The internal nodes are stored inside an array and they are addressed by array indexing. This limits the possible size of the + * queue to the number of elements that can be addressed by the index type (usually 2**16-2), but on platforms that lack + * double-width compare-and-exchange instructions, this is the best way to achieve lock-freedom. + * This implies that a data structure is bounded. + * */ +template <bool IsFixedSized> +struct fixed_sized: + boost::parameter::template_keyword<tag::fixed_sized, boost::mpl::bool_<IsFixedSized> > +{}; + +/** Sets the \b capacity of a data structure at compile-time. + * + * This implies that a data structure is bounded and fixed-sized. + * */ +template <size_t Size> +struct capacity: + boost::parameter::template_keyword<tag::capacity, boost::mpl::size_t<Size> > +{}; + +/** Defines the \b allocator type of a data structure. + * */ +template <class Alloc> +struct allocator: + boost::parameter::template_keyword<tag::allocator, Alloc> +{}; + +} +} + +#endif /* BOOST_LOCKFREE_POLICIES_HPP_INCLUDED */ + |