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1 | #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_CLANG_HPP_INCLUDED |
2 | #define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_CLANG_HPP_INCLUDED | |
3 | ||
4 | // MS compatible compilers support #pragma once | |
5 | ||
6 | #if defined(_MSC_VER) && (_MSC_VER >= 1020) | |
7 | # pragma once | |
8 | #endif | |
9 | ||
10 | // detail/sp_counted_base_clang.hpp - __c11 clang intrinsics | |
11 | // | |
12 | // Copyright (c) 2007, 2013, 2015 Peter Dimov | |
13 | // | |
14 | // Distributed under the Boost Software License, Version 1.0. | |
15 | // See accompanying file LICENSE_1_0.txt or copy at | |
16 | // http://www.boost.org/LICENSE_1_0.txt | |
17 | ||
18 | #include <boost/detail/sp_typeinfo.hpp> | |
19 | #include <boost/cstdint.hpp> | |
20 | ||
21 | namespace boost | |
22 | { | |
23 | ||
24 | namespace detail | |
25 | { | |
26 | ||
27 | typedef _Atomic( boost::int_least32_t ) atomic_int_least32_t; | |
28 | ||
29 | inline void atomic_increment( atomic_int_least32_t * pw ) | |
30 | { | |
31 | __c11_atomic_fetch_add( pw, 1, __ATOMIC_RELAXED ); | |
32 | } | |
33 | ||
34 | inline boost::int_least32_t atomic_decrement( atomic_int_least32_t * pw ) | |
35 | { | |
36 | return __c11_atomic_fetch_sub( pw, 1, __ATOMIC_ACQ_REL ); | |
37 | } | |
38 | ||
39 | inline boost::int_least32_t atomic_conditional_increment( atomic_int_least32_t * pw ) | |
40 | { | |
41 | // long r = *pw; | |
42 | // if( r != 0 ) ++*pw; | |
43 | // return r; | |
44 | ||
45 | boost::int_least32_t r = __c11_atomic_load( pw, __ATOMIC_RELAXED ); | |
46 | ||
47 | for( ;; ) | |
48 | { | |
49 | if( r == 0 ) | |
50 | { | |
51 | return r; | |
52 | } | |
53 | ||
54 | if( __c11_atomic_compare_exchange_weak( pw, &r, r + 1, __ATOMIC_RELAXED, __ATOMIC_RELAXED ) ) | |
55 | { | |
56 | return r; | |
57 | } | |
58 | } | |
59 | } | |
60 | ||
61 | #if defined(__clang__) | |
62 | # pragma clang diagnostic push | |
63 | # pragma clang diagnostic ignored "-Wweak-vtables" | |
64 | #endif | |
65 | ||
66 | class sp_counted_base | |
67 | { | |
68 | private: | |
69 | ||
70 | sp_counted_base( sp_counted_base const & ); | |
71 | sp_counted_base & operator= ( sp_counted_base const & ); | |
72 | ||
11fdf7f2 TL |
73 | atomic_int_least32_t use_count_; // #shared |
74 | atomic_int_least32_t weak_count_; // #weak + (#shared != 0) | |
7c673cae FG |
75 | |
76 | public: | |
77 | ||
78 | sp_counted_base() | |
79 | { | |
80 | __c11_atomic_init( &use_count_, 1 ); | |
81 | __c11_atomic_init( &weak_count_, 1 ); | |
82 | } | |
83 | ||
84 | virtual ~sp_counted_base() // nothrow | |
85 | { | |
86 | } | |
87 | ||
88 | // dispose() is called when use_count_ drops to zero, to release | |
89 | // the resources managed by *this. | |
90 | ||
91 | virtual void dispose() = 0; // nothrow | |
92 | ||
93 | // destroy() is called when weak_count_ drops to zero. | |
94 | ||
95 | virtual void destroy() // nothrow | |
96 | { | |
97 | delete this; | |
98 | } | |
99 | ||
100 | virtual void * get_deleter( sp_typeinfo const & ti ) = 0; | |
b32b8144 | 101 | virtual void * get_local_deleter( sp_typeinfo const & ti ) = 0; |
7c673cae FG |
102 | virtual void * get_untyped_deleter() = 0; |
103 | ||
104 | void add_ref_copy() | |
105 | { | |
106 | atomic_increment( &use_count_ ); | |
107 | } | |
108 | ||
109 | bool add_ref_lock() // true on success | |
110 | { | |
111 | return atomic_conditional_increment( &use_count_ ) != 0; | |
112 | } | |
113 | ||
114 | void release() // nothrow | |
115 | { | |
116 | if( atomic_decrement( &use_count_ ) == 1 ) | |
117 | { | |
118 | dispose(); | |
119 | weak_release(); | |
120 | } | |
121 | } | |
122 | ||
123 | void weak_add_ref() // nothrow | |
124 | { | |
125 | atomic_increment( &weak_count_ ); | |
126 | } | |
127 | ||
128 | void weak_release() // nothrow | |
129 | { | |
130 | if( atomic_decrement( &weak_count_ ) == 1 ) | |
131 | { | |
132 | destroy(); | |
133 | } | |
134 | } | |
135 | ||
136 | long use_count() const // nothrow | |
137 | { | |
138 | return __c11_atomic_load( const_cast< atomic_int_least32_t* >( &use_count_ ), __ATOMIC_ACQUIRE ); | |
139 | } | |
140 | }; | |
141 | ||
142 | #if defined(__clang__) | |
143 | # pragma clang diagnostic pop | |
144 | #endif | |
145 | ||
146 | } // namespace detail | |
147 | ||
148 | } // namespace boost | |
149 | ||
150 | #endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_CLANG_HPP_INCLUDED |