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1 | #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_PT_HPP_INCLUDED |
2 | #define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_PT_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 | // | |
11 | // detail/sp_counted_base_pt.hpp | |
12 | // | |
13 | // Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd. | |
14 | // Copyright 2004-2005 Peter Dimov | |
15 | // | |
16 | // Distributed under the Boost Software License, Version 1.0. (See | |
17 | // accompanying file LICENSE_1_0.txt or copy at | |
18 | // http://www.boost.org/LICENSE_1_0.txt) | |
19 | // | |
20 | ||
92f5a8d4 | 21 | #include <boost/smart_ptr/detail/sp_typeinfo_.hpp> |
7c673cae | 22 | #include <boost/assert.hpp> |
92f5a8d4 TL |
23 | #include <boost/config.hpp> |
24 | #include <boost/cstdint.hpp> | |
7c673cae FG |
25 | #include <pthread.h> |
26 | ||
27 | namespace boost | |
28 | { | |
29 | ||
30 | namespace detail | |
31 | { | |
32 | ||
92f5a8d4 | 33 | class BOOST_SYMBOL_VISIBLE sp_counted_base |
7c673cae FG |
34 | { |
35 | private: | |
36 | ||
37 | sp_counted_base( sp_counted_base const & ); | |
38 | sp_counted_base & operator= ( sp_counted_base const & ); | |
39 | ||
92f5a8d4 TL |
40 | boost::int_least32_t use_count_; // #shared |
41 | boost::int_least32_t weak_count_; // #weak + (#shared != 0) | |
7c673cae FG |
42 | |
43 | mutable pthread_mutex_t m_; | |
44 | ||
45 | public: | |
46 | ||
47 | sp_counted_base(): use_count_( 1 ), weak_count_( 1 ) | |
48 | { | |
49 | // HPUX 10.20 / DCE has a nonstandard pthread_mutex_init | |
50 | ||
51 | #if defined(__hpux) && defined(_DECTHREADS_) | |
52 | BOOST_VERIFY( pthread_mutex_init( &m_, pthread_mutexattr_default ) == 0 ); | |
53 | #else | |
54 | BOOST_VERIFY( pthread_mutex_init( &m_, 0 ) == 0 ); | |
55 | #endif | |
56 | } | |
57 | ||
58 | virtual ~sp_counted_base() // nothrow | |
59 | { | |
60 | BOOST_VERIFY( pthread_mutex_destroy( &m_ ) == 0 ); | |
61 | } | |
62 | ||
63 | // dispose() is called when use_count_ drops to zero, to release | |
64 | // the resources managed by *this. | |
65 | ||
66 | virtual void dispose() = 0; // nothrow | |
67 | ||
68 | // destroy() is called when weak_count_ drops to zero. | |
69 | ||
70 | virtual void destroy() // nothrow | |
71 | { | |
72 | delete this; | |
73 | } | |
74 | ||
92f5a8d4 TL |
75 | virtual void * get_deleter( sp_typeinfo_ const & ti ) = 0; |
76 | virtual void * get_local_deleter( sp_typeinfo_ const & ti ) = 0; | |
7c673cae FG |
77 | virtual void * get_untyped_deleter() = 0; |
78 | ||
79 | void add_ref_copy() | |
80 | { | |
81 | BOOST_VERIFY( pthread_mutex_lock( &m_ ) == 0 ); | |
82 | ++use_count_; | |
83 | BOOST_VERIFY( pthread_mutex_unlock( &m_ ) == 0 ); | |
84 | } | |
85 | ||
86 | bool add_ref_lock() // true on success | |
87 | { | |
88 | BOOST_VERIFY( pthread_mutex_lock( &m_ ) == 0 ); | |
89 | bool r = use_count_ == 0? false: ( ++use_count_, true ); | |
90 | BOOST_VERIFY( pthread_mutex_unlock( &m_ ) == 0 ); | |
91 | return r; | |
92 | } | |
93 | ||
94 | void release() // nothrow | |
95 | { | |
96 | BOOST_VERIFY( pthread_mutex_lock( &m_ ) == 0 ); | |
92f5a8d4 | 97 | boost::int_least32_t new_use_count = --use_count_; |
7c673cae FG |
98 | BOOST_VERIFY( pthread_mutex_unlock( &m_ ) == 0 ); |
99 | ||
100 | if( new_use_count == 0 ) | |
101 | { | |
102 | dispose(); | |
103 | weak_release(); | |
104 | } | |
105 | } | |
106 | ||
107 | void weak_add_ref() // nothrow | |
108 | { | |
109 | BOOST_VERIFY( pthread_mutex_lock( &m_ ) == 0 ); | |
110 | ++weak_count_; | |
111 | BOOST_VERIFY( pthread_mutex_unlock( &m_ ) == 0 ); | |
112 | } | |
113 | ||
114 | void weak_release() // nothrow | |
115 | { | |
116 | BOOST_VERIFY( pthread_mutex_lock( &m_ ) == 0 ); | |
92f5a8d4 | 117 | boost::int_least32_t new_weak_count = --weak_count_; |
7c673cae FG |
118 | BOOST_VERIFY( pthread_mutex_unlock( &m_ ) == 0 ); |
119 | ||
120 | if( new_weak_count == 0 ) | |
121 | { | |
122 | destroy(); | |
123 | } | |
124 | } | |
125 | ||
126 | long use_count() const // nothrow | |
127 | { | |
128 | BOOST_VERIFY( pthread_mutex_lock( &m_ ) == 0 ); | |
92f5a8d4 | 129 | boost::int_least32_t r = use_count_; |
7c673cae FG |
130 | BOOST_VERIFY( pthread_mutex_unlock( &m_ ) == 0 ); |
131 | ||
132 | return r; | |
133 | } | |
134 | }; | |
135 | ||
136 | } // namespace detail | |
137 | ||
138 | } // namespace boost | |
139 | ||
140 | #endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_PT_HPP_INCLUDED |