smart_ptr/detail/sp_counted_base_snc_ps3.hpp

0001 #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_SNC_PS3_HPP_INCLUDED
0002 #define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_SNC_PS3_HPP_INCLUDED
0003
0004 // MS compatible compilers support #pragma once
0005 #if defined(_MSC_VER) && (_MSC_VER >= 1020)
0006 # pragma once
0007 #endif
0008
0009 //  detail/sp_counted_base_gcc_snc_ps3.hpp - PS3 Cell
0010 //
0011 //  Copyright (c) 2006 Piotr Wyderski
0012 //  Copyright (c) 2006 Tomas Puverle
0013 //  Copyright (c) 2006 Peter Dimov
0014 //  Copyright (c) 2011 Emil Dotchevski
0015 //
0016 //  Distributed under the Boost Software License, Version 1.0.
0017 //  See accompanying file LICENSE_1_0.txt or copy at
0018 //  http://www.boost.org/LICENSE_1_0.txt
0019 //
0020 //  Thanks to Michael van der Westhuizen
0021
0022 #include <boost/smart_ptr/detail/sp_typeinfo_.hpp>
0023 #include <boost/smart_ptr/detail/sp_obsolete.hpp>
0024 #include <boost/config.hpp>
0025 #include <inttypes.h> // uint32_t
0026
0027 #if defined(BOOST_SP_REPORT_IMPLEMENTATION)
0028
0029 #include <boost/config/pragma_message.hpp>
0030 BOOST_PRAGMA_MESSAGE("Using PS3 sp_counted_base")
0031
0032 #endif
0033
0034 BOOST_SP_OBSOLETE()
0035
0036 namespace boost
0037 {
0038
0039 namespace detail
0040 {
0041
0042 inline uint32_t compare_and_swap( uint32_t * dest_, uint32_t compare_, uint32_t swap_ )
0043 {
0044     return __builtin_cellAtomicCompareAndSwap32(dest_,compare_,swap_);
0045 }
0046
0047 inline uint32_t atomic_fetch_and_add( uint32_t * pw, uint32_t dv )
0048 {
0049     // long r = *pw;
0050     // *pw += dv;
0051     // return r;
0052
0053     for( ;; )
0054     {
0055         uint32_t r = *pw;
0056
0057         if( __builtin_expect((compare_and_swap(pw, r, r + dv) == r), 1) )
0058         {
0059             return r;
0060         }
0061     }
0062 }
0063
0064 inline void atomic_increment( uint32_t * pw )
0065 {
0066     (void) __builtin_cellAtomicIncr32( pw );
0067 }
0068
0069 inline uint32_t atomic_decrement( uint32_t * pw )
0070 {
0071     return __builtin_cellAtomicDecr32( pw );
0072 }
0073
0074 inline uint32_t atomic_conditional_increment( uint32_t * pw )
0075 {
0076     // long r = *pw;
0077     // if( r != 0 ) ++*pw;
0078     // return r;
0079
0080     for( ;; )
0081     {
0082         uint32_t r = *pw;
0083
0084         if( r == 0 )
0085         {
0086             return r;
0087         }
0088
0089         if( __builtin_expect( ( compare_and_swap( pw, r, r + 1 ) == r ), 1 ) )
0090         {
0091             return r;
0092         }
0093     }
0094 }
0095
0096 class BOOST_SYMBOL_VISIBLE sp_counted_base
0097 {
0098 private:
0099
0100     sp_counted_base( sp_counted_base const & );
0101     sp_counted_base & operator= ( sp_counted_base const & );
0102
0103     uint32_t use_count_;        // #shared
0104     uint32_t weak_count_;       // #weak + (#shared != 0)
0105
0106 public:
0107
0108     sp_counted_base(): use_count_( 1 ), weak_count_( 1 )
0109     {
0110     }
0111
0112     virtual ~sp_counted_base() // nothrow
0113     {
0114     }
0115
0116     // dispose() is called when use_count_ drops to zero, to release
0117     // the resources managed by *this.
0118
0119     virtual void dispose() = 0; // nothrow
0120
0121     // destroy() is called when weak_count_ drops to zero.
0122
0123     virtual void destroy() // nothrow
0124     {
0125         delete this;
0126     }
0127
0128     virtual void * get_deleter( sp_typeinfo_ const & ti ) = 0;
0129     virtual void * get_local_deleter( sp_typeinfo_ const & ti ) = 0;
0130     virtual void * get_untyped_deleter() = 0;
0131
0132     void add_ref_copy()
0133     {
0134         atomic_increment( &use_count_ );
0135     }
0136
0137     bool add_ref_lock() // true on success
0138     {
0139         return atomic_conditional_increment( &use_count_ ) != 0;
0140     }
0141
0142     void release() // nothrow
0143     {
0144         if( atomic_decrement( &use_count_ ) == 1 )
0145         {
0146             dispose();
0147             weak_release();
0148         }
0149     }
0150
0151     void weak_add_ref() // nothrow
0152     {
0153         atomic_increment( &weak_count_ );
0154     }
0155
0156     void weak_release() // nothrow
0157     {
0158         if( atomic_decrement( &weak_count_ ) == 1 )
0159         {
0160             destroy();
0161         }
0162     }
0163
0164     long use_count() const // nothrow
0165     {
0166         return const_cast< uint32_t const volatile & >( use_count_ );
0167     }
0168 };
0169
0170 } // namespace detail
0171
0172 } // namespace boost
0173
0174 #endif  // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_SNC_PS3_HPP_INCLUDED