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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 | ||
22 | #include <boost/detail/sp_typeinfo.hpp> | |
23 | #include <inttypes.h> // uint32_t | |
24 | ||
25 | namespace boost | |
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 boost | |
161 | ||
162 | #endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_SNC_PS3_HPP_INCLUDED |