[44] | 1 | #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_PT_HPP_INCLUDED |
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| 2 | #define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_PT_HPP_INCLUDED |
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| 3 | |
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| 4 | // MS compatible compilers support #pragma once |
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| 5 | |
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| 6 | #if defined(_MSC_VER) && (_MSC_VER >= 1020) |
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| 7 | # pragma once |
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| 8 | #endif |
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| 9 | |
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| 10 | // |
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| 11 | // detail/sp_counted_base_pt.hpp |
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| 12 | // |
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| 13 | // Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd. |
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| 14 | // Copyright 2004-2005 Peter Dimov |
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| 15 | // |
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| 16 | // Distributed under the Boost Software License, Version 1.0. (See |
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| 17 | // accompanying file LICENSE_1_0.txt or copy at |
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| 18 | // http://www.boost.org/LICENSE_1_0.txt) |
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| 19 | // |
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| 20 | |
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| 21 | #include <boost/detail/sp_typeinfo.hpp> |
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| 22 | #include <pthread.h> |
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| 23 | |
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| 24 | namespace boost |
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| 25 | { |
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| 26 | |
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| 27 | namespace detail |
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| 28 | { |
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| 29 | |
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| 30 | class sp_counted_base |
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| 31 | { |
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| 32 | private: |
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| 33 | |
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| 34 | sp_counted_base( sp_counted_base const & ); |
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| 35 | sp_counted_base & operator= ( sp_counted_base const & ); |
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| 36 | |
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| 37 | long use_count_; // #shared |
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| 38 | long weak_count_; // #weak + (#shared != 0) |
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| 39 | |
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| 40 | mutable pthread_mutex_t m_; |
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| 41 | |
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| 42 | public: |
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| 43 | |
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| 44 | sp_counted_base(): use_count_( 1 ), weak_count_( 1 ) |
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| 45 | { |
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| 46 | // HPUX 10.20 / DCE has a nonstandard pthread_mutex_init |
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| 47 | |
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| 48 | #if defined(__hpux) && defined(_DECTHREADS_) |
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| 49 | pthread_mutex_init( &m_, pthread_mutexattr_default ); |
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| 50 | #else |
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| 51 | pthread_mutex_init( &m_, 0 ); |
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| 52 | #endif |
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| 53 | } |
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| 54 | |
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| 55 | virtual ~sp_counted_base() // nothrow |
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| 56 | { |
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| 57 | pthread_mutex_destroy( &m_ ); |
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| 58 | } |
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| 59 | |
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| 60 | // dispose() is called when use_count_ drops to zero, to release |
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| 61 | // the resources managed by *this. |
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| 62 | |
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| 63 | virtual void dispose() = 0; // nothrow |
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| 64 | |
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| 65 | // destroy() is called when weak_count_ drops to zero. |
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| 66 | |
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| 67 | virtual void destroy() // nothrow |
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| 68 | { |
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| 69 | delete this; |
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| 70 | } |
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| 71 | |
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| 72 | virtual void * get_deleter( sp_typeinfo const & ti ) = 0; |
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| 73 | |
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| 74 | void add_ref_copy() |
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| 75 | { |
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| 76 | pthread_mutex_lock( &m_ ); |
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| 77 | ++use_count_; |
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| 78 | pthread_mutex_unlock( &m_ ); |
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| 79 | } |
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| 80 | |
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| 81 | bool add_ref_lock() // true on success |
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| 82 | { |
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| 83 | pthread_mutex_lock( &m_ ); |
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| 84 | bool r = use_count_ == 0? false: ( ++use_count_, true ); |
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| 85 | pthread_mutex_unlock( &m_ ); |
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| 86 | return r; |
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| 87 | } |
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| 88 | |
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| 89 | void release() // nothrow |
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| 90 | { |
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| 91 | pthread_mutex_lock( &m_ ); |
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| 92 | long new_use_count = --use_count_; |
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| 93 | pthread_mutex_unlock( &m_ ); |
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| 94 | |
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| 95 | if( new_use_count == 0 ) |
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| 96 | { |
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| 97 | dispose(); |
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| 98 | weak_release(); |
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| 99 | } |
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| 100 | } |
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| 101 | |
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| 102 | void weak_add_ref() // nothrow |
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| 103 | { |
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| 104 | pthread_mutex_lock( &m_ ); |
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| 105 | ++weak_count_; |
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| 106 | pthread_mutex_unlock( &m_ ); |
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| 107 | } |
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| 108 | |
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| 109 | void weak_release() // nothrow |
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| 110 | { |
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| 111 | pthread_mutex_lock( &m_ ); |
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| 112 | long new_weak_count = --weak_count_; |
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| 113 | pthread_mutex_unlock( &m_ ); |
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| 114 | |
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| 115 | if( new_weak_count == 0 ) |
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| 116 | { |
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| 117 | destroy(); |
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| 118 | } |
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| 119 | } |
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| 120 | |
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| 121 | long use_count() const // nothrow |
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| 122 | { |
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| 123 | pthread_mutex_lock( &m_ ); |
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| 124 | long r = use_count_; |
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| 125 | pthread_mutex_unlock( &m_ ); |
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| 126 | |
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| 127 | return r; |
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| 128 | } |
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| 129 | }; |
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| 130 | |
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| 131 | } // namespace detail |
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| 132 | |
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| 133 | } // namespace boost |
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| 134 | |
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| 135 | #endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_PT_HPP_INCLUDED |
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