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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 | ||
92f5a8d4 TL |
18 | #include <boost/smart_ptr/detail/sp_typeinfo_.hpp> |
19 | #include <boost/smart_ptr/detail/sp_noexcept.hpp> | |
20 | #include <boost/config.hpp> | |
7c673cae FG |
21 | #include <boost/cstdint.hpp> |
22 | ||
23 | namespace boost | |
24 | { | |
25 | ||
26 | namespace detail | |
27 | { | |
28 | ||
29 | typedef _Atomic( boost::int_least32_t ) atomic_int_least32_t; | |
30 | ||
92f5a8d4 | 31 | inline void atomic_increment( atomic_int_least32_t * pw ) BOOST_SP_NOEXCEPT |
7c673cae FG |
32 | { |
33 | __c11_atomic_fetch_add( pw, 1, __ATOMIC_RELAXED ); | |
34 | } | |
35 | ||
92f5a8d4 | 36 | inline boost::int_least32_t atomic_decrement( atomic_int_least32_t * pw ) BOOST_SP_NOEXCEPT |
7c673cae FG |
37 | { |
38 | return __c11_atomic_fetch_sub( pw, 1, __ATOMIC_ACQ_REL ); | |
39 | } | |
40 | ||
92f5a8d4 | 41 | inline boost::int_least32_t atomic_conditional_increment( atomic_int_least32_t * pw ) BOOST_SP_NOEXCEPT |
7c673cae FG |
42 | { |
43 | // long r = *pw; | |
44 | // if( r != 0 ) ++*pw; | |
45 | // return r; | |
46 | ||
47 | boost::int_least32_t r = __c11_atomic_load( pw, __ATOMIC_RELAXED ); | |
48 | ||
49 | for( ;; ) | |
50 | { | |
51 | if( r == 0 ) | |
52 | { | |
53 | return r; | |
54 | } | |
55 | ||
56 | if( __c11_atomic_compare_exchange_weak( pw, &r, r + 1, __ATOMIC_RELAXED, __ATOMIC_RELAXED ) ) | |
57 | { | |
58 | return r; | |
59 | } | |
60 | } | |
61 | } | |
62 | ||
63 | #if defined(__clang__) | |
64 | # pragma clang diagnostic push | |
65 | # pragma clang diagnostic ignored "-Wweak-vtables" | |
66 | #endif | |
67 | ||
92f5a8d4 | 68 | class BOOST_SYMBOL_VISIBLE sp_counted_base |
7c673cae FG |
69 | { |
70 | private: | |
71 | ||
72 | sp_counted_base( sp_counted_base const & ); | |
73 | sp_counted_base & operator= ( sp_counted_base const & ); | |
74 | ||
11fdf7f2 TL |
75 | atomic_int_least32_t use_count_; // #shared |
76 | atomic_int_least32_t weak_count_; // #weak + (#shared != 0) | |
7c673cae FG |
77 | |
78 | public: | |
79 | ||
92f5a8d4 | 80 | sp_counted_base() BOOST_SP_NOEXCEPT |
7c673cae FG |
81 | { |
82 | __c11_atomic_init( &use_count_, 1 ); | |
83 | __c11_atomic_init( &weak_count_, 1 ); | |
84 | } | |
85 | ||
92f5a8d4 | 86 | virtual ~sp_counted_base() /*BOOST_SP_NOEXCEPT*/ |
7c673cae FG |
87 | { |
88 | } | |
89 | ||
90 | // dispose() is called when use_count_ drops to zero, to release | |
91 | // the resources managed by *this. | |
92 | ||
92f5a8d4 | 93 | virtual void dispose() BOOST_SP_NOEXCEPT = 0; // nothrow |
7c673cae FG |
94 | |
95 | // destroy() is called when weak_count_ drops to zero. | |
96 | ||
92f5a8d4 | 97 | virtual void destroy() BOOST_SP_NOEXCEPT // nothrow |
7c673cae FG |
98 | { |
99 | delete this; | |
100 | } | |
101 | ||
92f5a8d4 TL |
102 | virtual void * get_deleter( sp_typeinfo_ const & ti ) BOOST_SP_NOEXCEPT = 0; |
103 | virtual void * get_local_deleter( sp_typeinfo_ const & ti ) BOOST_SP_NOEXCEPT = 0; | |
104 | virtual void * get_untyped_deleter() BOOST_SP_NOEXCEPT = 0; | |
7c673cae | 105 | |
92f5a8d4 | 106 | void add_ref_copy() BOOST_SP_NOEXCEPT |
7c673cae FG |
107 | { |
108 | atomic_increment( &use_count_ ); | |
109 | } | |
110 | ||
92f5a8d4 | 111 | bool add_ref_lock() BOOST_SP_NOEXCEPT // true on success |
7c673cae FG |
112 | { |
113 | return atomic_conditional_increment( &use_count_ ) != 0; | |
114 | } | |
115 | ||
92f5a8d4 | 116 | void release() BOOST_SP_NOEXCEPT |
7c673cae FG |
117 | { |
118 | if( atomic_decrement( &use_count_ ) == 1 ) | |
119 | { | |
120 | dispose(); | |
121 | weak_release(); | |
122 | } | |
123 | } | |
124 | ||
92f5a8d4 | 125 | void weak_add_ref() BOOST_SP_NOEXCEPT |
7c673cae FG |
126 | { |
127 | atomic_increment( &weak_count_ ); | |
128 | } | |
129 | ||
92f5a8d4 | 130 | void weak_release() BOOST_SP_NOEXCEPT |
7c673cae FG |
131 | { |
132 | if( atomic_decrement( &weak_count_ ) == 1 ) | |
133 | { | |
134 | destroy(); | |
135 | } | |
136 | } | |
137 | ||
92f5a8d4 | 138 | long use_count() const BOOST_SP_NOEXCEPT |
7c673cae FG |
139 | { |
140 | return __c11_atomic_load( const_cast< atomic_int_least32_t* >( &use_count_ ), __ATOMIC_ACQUIRE ); | |
141 | } | |
142 | }; | |
143 | ||
144 | #if defined(__clang__) | |
145 | # pragma clang diagnostic pop | |
146 | #endif | |
147 | ||
148 | } // namespace detail | |
149 | ||
150 | } // namespace boost | |
151 | ||
152 | #endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_CLANG_HPP_INCLUDED |