Jeff Thompson | f7d4994 | 2013-08-01 16:47:40 -0700 | [diff] [blame] | 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 |
| 3 | |
| 4 | // MS compatible compilers support #pragma once |
| 5 | #if defined(_MSC_VER) && (_MSC_VER >= 1020) |
| 6 | # pragma once |
| 7 | #endif |
| 8 | |
| 9 | // detail/sp_counted_base_gcc_sparc.hpp - g++ on Sparc V8+ |
| 10 | // |
| 11 | // Copyright (c) 2006 Piotr Wyderski |
| 12 | // Copyright (c) 2006 Tomas Puverle |
| 13 | // Copyright (c) 2006 Peter Dimov |
| 14 | // Copyright (c) 2011 Emil Dotchevski |
| 15 | // |
| 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 |
| 19 | // |
| 20 | // Thanks to Michael van der Westhuizen |
| 21 | |
Jeff Thompson | 2277ce5 | 2013-08-01 17:34:11 -0700 | [diff] [blame] | 22 | #include <ndnboost/detail/sp_typeinfo.hpp> |
Jeff Thompson | f7d4994 | 2013-08-01 16:47:40 -0700 | [diff] [blame] | 23 | #include <inttypes.h> // uint32_t |
| 24 | |
| 25 | namespace ndnboost |
| 26 | { |
| 27 | |
| 28 | namespace detail |
| 29 | { |
| 30 | |
| 31 | inline uint32_t compare_and_swap( uint32_t * dest_, uint32_t compare_, uint32_t swap_ ) |
| 32 | { |
| 33 | return __builtin_cellAtomicCompareAndSwap32(dest_,compare_,swap_); |
| 34 | } |
| 35 | |
| 36 | inline uint32_t atomic_fetch_and_add( uint32_t * pw, uint32_t dv ) |
| 37 | { |
| 38 | // long r = *pw; |
| 39 | // *pw += dv; |
| 40 | // return r; |
| 41 | |
| 42 | for( ;; ) |
| 43 | { |
| 44 | uint32_t r = *pw; |
| 45 | |
| 46 | if( __builtin_expect((compare_and_swap(pw, r, r + dv) == r), 1) ) |
| 47 | { |
| 48 | return r; |
| 49 | } |
| 50 | } |
| 51 | } |
| 52 | |
| 53 | inline void atomic_increment( uint32_t * pw ) |
| 54 | { |
| 55 | (void) __builtin_cellAtomicIncr32( pw ); |
| 56 | } |
| 57 | |
| 58 | inline uint32_t atomic_decrement( uint32_t * pw ) |
| 59 | { |
| 60 | return __builtin_cellAtomicDecr32( pw ); |
| 61 | } |
| 62 | |
| 63 | inline uint32_t atomic_conditional_increment( uint32_t * pw ) |
| 64 | { |
| 65 | // long r = *pw; |
| 66 | // if( r != 0 ) ++*pw; |
| 67 | // return r; |
| 68 | |
| 69 | for( ;; ) |
| 70 | { |
| 71 | uint32_t r = *pw; |
| 72 | |
| 73 | if( r == 0 ) |
| 74 | { |
| 75 | return r; |
| 76 | } |
| 77 | |
| 78 | if( __builtin_expect( ( compare_and_swap( pw, r, r + 1 ) == r ), 1 ) ) |
| 79 | { |
| 80 | return r; |
| 81 | } |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | class sp_counted_base |
| 86 | { |
| 87 | private: |
| 88 | |
| 89 | sp_counted_base( sp_counted_base const & ); |
| 90 | sp_counted_base & operator= ( sp_counted_base const & ); |
| 91 | |
| 92 | uint32_t use_count_; // #shared |
| 93 | uint32_t weak_count_; // #weak + (#shared != 0) |
| 94 | |
| 95 | public: |
| 96 | |
| 97 | sp_counted_base(): use_count_( 1 ), weak_count_( 1 ) |
| 98 | { |
| 99 | } |
| 100 | |
| 101 | virtual ~sp_counted_base() // nothrow |
| 102 | { |
| 103 | } |
| 104 | |
| 105 | // dispose() is called when use_count_ drops to zero, to release |
| 106 | // the resources managed by *this. |
| 107 | |
| 108 | virtual void dispose() = 0; // nothrow |
| 109 | |
| 110 | // destroy() is called when weak_count_ drops to zero. |
| 111 | |
| 112 | virtual void destroy() // nothrow |
| 113 | { |
| 114 | delete this; |
| 115 | } |
| 116 | |
| 117 | virtual void * get_deleter( sp_typeinfo const & ti ) = 0; |
| 118 | virtual void * get_untyped_deleter() = 0; |
| 119 | |
| 120 | void add_ref_copy() |
| 121 | { |
| 122 | atomic_increment( &use_count_ ); |
| 123 | } |
| 124 | |
| 125 | bool add_ref_lock() // true on success |
| 126 | { |
| 127 | return atomic_conditional_increment( &use_count_ ) != 0; |
| 128 | } |
| 129 | |
| 130 | void release() // nothrow |
| 131 | { |
| 132 | if( atomic_decrement( &use_count_ ) == 1 ) |
| 133 | { |
| 134 | dispose(); |
| 135 | weak_release(); |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | void weak_add_ref() // nothrow |
| 140 | { |
| 141 | atomic_increment( &weak_count_ ); |
| 142 | } |
| 143 | |
| 144 | void weak_release() // nothrow |
| 145 | { |
| 146 | if( atomic_decrement( &weak_count_ ) == 1 ) |
| 147 | { |
| 148 | destroy(); |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | long use_count() const // nothrow |
| 153 | { |
| 154 | return const_cast< uint32_t const volatile & >( use_count_ ); |
| 155 | } |
| 156 | }; |
| 157 | |
| 158 | } // namespace detail |
| 159 | |
| 160 | } // namespace ndnboost |
| 161 | |
| 162 | #endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_SNC_PS3_HPP_INCLUDED |