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author | Anas Nashif <anas.nashif@intel.com> | 2012-10-30 12:57:26 -0700 |
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committer | Anas Nashif <anas.nashif@intel.com> | 2012-10-30 12:57:26 -0700 |
commit | 1a78a62555be32868418fe52f8e330c9d0f95d5a (patch) | |
tree | d3765a80e7d3b9640ec2e930743630cd6b9fce2b /boost/smart_ptr/detail/sp_counted_base_solaris.hpp | |
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Imported Upstream version 1.49.0upstream/1.49.0
Diffstat (limited to 'boost/smart_ptr/detail/sp_counted_base_solaris.hpp')
-rw-r--r-- | boost/smart_ptr/detail/sp_counted_base_solaris.hpp | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/boost/smart_ptr/detail/sp_counted_base_solaris.hpp b/boost/smart_ptr/detail/sp_counted_base_solaris.hpp new file mode 100644 index 0000000000..d1b6beceb1 --- /dev/null +++ b/boost/smart_ptr/detail/sp_counted_base_solaris.hpp @@ -0,0 +1,113 @@ +#ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_SOLARIS_HPP_INCLUDED +#define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_SOLARIS_HPP_INCLUDED + +// +// detail/sp_counted_base_solaris.hpp +// based on: detail/sp_counted_base_w32.hpp +// +// Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd. +// Copyright 2004-2005 Peter Dimov +// Copyright 2006 Michael van der Westhuizen +// +// 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) +// +// +// Lock-free algorithm by Alexander Terekhov +// +// Thanks to Ben Hitchings for the #weak + (#shared != 0) +// formulation +// + +#include <boost/detail/sp_typeinfo.hpp> +#include <atomic.h> + +namespace boost +{ + +namespace detail +{ + +class sp_counted_base +{ +private: + + sp_counted_base( sp_counted_base const & ); + sp_counted_base & operator= ( sp_counted_base const & ); + + uint32_t use_count_; // #shared + uint32_t weak_count_; // #weak + (#shared != 0) + +public: + + sp_counted_base(): use_count_( 1 ), weak_count_( 1 ) + { + } + + virtual ~sp_counted_base() // nothrow + { + } + + // dispose() is called when use_count_ drops to zero, to release + // the resources managed by *this. + + virtual void dispose() = 0; // nothrow + + // destroy() is called when weak_count_ drops to zero. + + virtual void destroy() // nothrow + { + delete this; + } + + virtual void * get_deleter( sp_typeinfo const & ti ) = 0; + + void add_ref_copy() + { + atomic_inc_32( &use_count_ ); + } + + bool add_ref_lock() // true on success + { + for( ;; ) + { + uint32_t tmp = static_cast< uint32_t const volatile& >( use_count_ ); + if( tmp == 0 ) return false; + if( atomic_cas_32( &use_count_, tmp, tmp + 1 ) == tmp ) return true; + } + } + + void release() // nothrow + { + if( atomic_dec_32_nv( &use_count_ ) == 0 ) + { + dispose(); + weak_release(); + } + } + + void weak_add_ref() // nothrow + { + atomic_inc_32( &weak_count_ ); + } + + void weak_release() // nothrow + { + if( atomic_dec_32_nv( &weak_count_ ) == 0 ) + { + destroy(); + } + } + + long use_count() const // nothrow + { + return static_cast<long const volatile &>( use_count_ ); + } +}; + +} // namespace detail + +} // namespace boost + +#endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_SOLARIS_HPP_INCLUDED |