1 #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_SNC_PS3_HPP_INCLUDED
2 #define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_SNC_PS3_HPP_INCLUDED
4 // MS compatible compilers support #pragma once
5 #if defined(_MSC_VER) && (_MSC_VER >= 1020)
9 // detail/sp_counted_base_gcc_sparc.hpp - g++ on Sparc V8+
11 // Copyright (c) 2006 Piotr Wyderski
12 // Copyright (c) 2006 Tomas Puverle
13 // Copyright (c) 2006 Peter Dimov
14 // Copyright (c) 2011 Emil Dotchevski
16 // Distributed under the Boost Software License, Version 1.0.
17 // See accompanying file LICENSE_1_0.txt or copy at
18 // http://www.boost.org/LICENSE_1_0.txt
20 // Thanks to Michael van der Westhuizen
22 #include <boost/smart_ptr/detail/sp_typeinfo_.hpp>
23 #include <boost/config.hpp>
24 #include <inttypes.h> // uint32_t
32 inline uint32_t compare_and_swap( uint32_t * dest_, uint32_t compare_, uint32_t swap_ )
34 return __builtin_cellAtomicCompareAndSwap32(dest_,compare_,swap_);
37 inline uint32_t atomic_fetch_and_add( uint32_t * pw, uint32_t dv )
47 if( __builtin_expect((compare_and_swap(pw, r, r + dv) == r), 1) )
54 inline void atomic_increment( uint32_t * pw )
56 (void) __builtin_cellAtomicIncr32( pw );
59 inline uint32_t atomic_decrement( uint32_t * pw )
61 return __builtin_cellAtomicDecr32( pw );
64 inline uint32_t atomic_conditional_increment( uint32_t * pw )
67 // if( r != 0 ) ++*pw;
79 if( __builtin_expect( ( compare_and_swap( pw, r, r + 1 ) == r ), 1 ) )
86 class BOOST_SYMBOL_VISIBLE sp_counted_base
90 sp_counted_base( sp_counted_base const & );
91 sp_counted_base & operator= ( sp_counted_base const & );
93 uint32_t use_count_; // #shared
94 uint32_t weak_count_; // #weak + (#shared != 0)
98 sp_counted_base(): use_count_( 1 ), weak_count_( 1 )
102 virtual ~sp_counted_base() // nothrow
106 // dispose() is called when use_count_ drops to zero, to release
107 // the resources managed by *this.
109 virtual void dispose() = 0; // nothrow
111 // destroy() is called when weak_count_ drops to zero.
113 virtual void destroy() // nothrow
118 virtual void * get_deleter( sp_typeinfo_ const & ti ) = 0;
119 virtual void * get_local_deleter( sp_typeinfo_ const & ti ) = 0;
120 virtual void * get_untyped_deleter() = 0;
124 atomic_increment( &use_count_ );
127 bool add_ref_lock() // true on success
129 return atomic_conditional_increment( &use_count_ ) != 0;
132 void release() // nothrow
134 if( atomic_decrement( &use_count_ ) == 1 )
141 void weak_add_ref() // nothrow
143 atomic_increment( &weak_count_ );
146 void weak_release() // nothrow
148 if( atomic_decrement( &weak_count_ ) == 1 )
154 long use_count() const // nothrow
156 return const_cast< uint32_t const volatile & >( use_count_ );
160 } // namespace detail
164 #endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_SNC_PS3_HPP_INCLUDED