]>
Commit | Line | Data |
---|---|---|
7c673cae FG |
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 | ||
92f5a8d4 TL |
22 | #include <boost/smart_ptr/detail/sp_typeinfo_.hpp> |
23 | #include <boost/config.hpp> | |
7c673cae FG |
24 | #include <inttypes.h> // uint32_t |
25 | ||
26 | namespace boost | |
27 | { | |
28 | ||
29 | namespace detail | |
30 | { | |
31 | ||
32 | inline uint32_t compare_and_swap( uint32_t * dest_, uint32_t compare_, uint32_t swap_ ) | |
33 | { | |
34 | return __builtin_cellAtomicCompareAndSwap32(dest_,compare_,swap_); | |
35 | } | |
36 | ||
37 | inline uint32_t atomic_fetch_and_add( uint32_t * pw, uint32_t dv ) | |
38 | { | |
39 | // long r = *pw; | |
40 | // *pw += dv; | |
41 | // return r; | |
42 | ||
43 | for( ;; ) | |
44 | { | |
45 | uint32_t r = *pw; | |
46 | ||
47 | if( __builtin_expect((compare_and_swap(pw, r, r + dv) == r), 1) ) | |
48 | { | |
49 | return r; | |
50 | } | |
51 | } | |
52 | } | |
53 | ||
54 | inline void atomic_increment( uint32_t * pw ) | |
55 | { | |
56 | (void) __builtin_cellAtomicIncr32( pw ); | |
57 | } | |
58 | ||
59 | inline uint32_t atomic_decrement( uint32_t * pw ) | |
60 | { | |
61 | return __builtin_cellAtomicDecr32( pw ); | |
62 | } | |
63 | ||
64 | inline uint32_t atomic_conditional_increment( uint32_t * pw ) | |
65 | { | |
66 | // long r = *pw; | |
67 | // if( r != 0 ) ++*pw; | |
68 | // return r; | |
69 | ||
70 | for( ;; ) | |
71 | { | |
72 | uint32_t r = *pw; | |
73 | ||
74 | if( r == 0 ) | |
75 | { | |
76 | return r; | |
77 | } | |
78 | ||
79 | if( __builtin_expect( ( compare_and_swap( pw, r, r + 1 ) == r ), 1 ) ) | |
80 | { | |
81 | return r; | |
82 | } | |
83 | } | |
84 | } | |
85 | ||
92f5a8d4 | 86 | class BOOST_SYMBOL_VISIBLE sp_counted_base |
7c673cae FG |
87 | { |
88 | private: | |
89 | ||
90 | sp_counted_base( sp_counted_base const & ); | |
91 | sp_counted_base & operator= ( sp_counted_base const & ); | |
92 | ||
93 | uint32_t use_count_; // #shared | |
94 | uint32_t weak_count_; // #weak + (#shared != 0) | |
95 | ||
96 | public: | |
97 | ||
98 | sp_counted_base(): use_count_( 1 ), weak_count_( 1 ) | |
99 | { | |
100 | } | |
101 | ||
102 | virtual ~sp_counted_base() // nothrow | |
103 | { | |
104 | } | |
105 | ||
106 | // dispose() is called when use_count_ drops to zero, to release | |
107 | // the resources managed by *this. | |
108 | ||
109 | virtual void dispose() = 0; // nothrow | |
110 | ||
111 | // destroy() is called when weak_count_ drops to zero. | |
112 | ||
113 | virtual void destroy() // nothrow | |
114 | { | |
115 | delete this; | |
116 | } | |
117 | ||
92f5a8d4 TL |
118 | virtual void * get_deleter( sp_typeinfo_ const & ti ) = 0; |
119 | virtual void * get_local_deleter( sp_typeinfo_ const & ti ) = 0; | |
7c673cae FG |
120 | virtual void * get_untyped_deleter() = 0; |
121 | ||
122 | void add_ref_copy() | |
123 | { | |
124 | atomic_increment( &use_count_ ); | |
125 | } | |
126 | ||
127 | bool add_ref_lock() // true on success | |
128 | { | |
129 | return atomic_conditional_increment( &use_count_ ) != 0; | |
130 | } | |
131 | ||
132 | void release() // nothrow | |
133 | { | |
134 | if( atomic_decrement( &use_count_ ) == 1 ) | |
135 | { | |
136 | dispose(); | |
137 | weak_release(); | |
138 | } | |
139 | } | |
140 | ||
141 | void weak_add_ref() // nothrow | |
142 | { | |
143 | atomic_increment( &weak_count_ ); | |
144 | } | |
145 | ||
146 | void weak_release() // nothrow | |
147 | { | |
148 | if( atomic_decrement( &weak_count_ ) == 1 ) | |
149 | { | |
150 | destroy(); | |
151 | } | |
152 | } | |
153 | ||
154 | long use_count() const // nothrow | |
155 | { | |
156 | return const_cast< uint32_t const volatile & >( use_count_ ); | |
157 | } | |
158 | }; | |
159 | ||
160 | } // namespace detail | |
161 | ||
162 | } // namespace boost | |
163 | ||
164 | #endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_SNC_PS3_HPP_INCLUDED |