1 #ifndef BOOST_DETAIL_SP_COUNTED_BASE_PT_HPP_INCLUDED
2 #define BOOST_DETAIL_SP_COUNTED_BASE_PT_HPP_INCLUDED
4 // MS compatible compilers support #pragma once
6 #if defined(_MSC_VER) && (_MSC_VER >= 1020)
11 // detail/sp_counted_base_pt.hpp
13 // Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd.
14 // Copyright 2004-2005 Peter Dimov
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)
34 sp_counted_base( sp_counted_base const & );
35 sp_counted_base & operator= ( sp_counted_base const & );
37 long use_count_; // #shared
38 long weak_count_; // #weak + (#shared != 0)
40 mutable pthread_mutex_t m_;
44 sp_counted_base(): use_count_( 1 ), weak_count_( 1 )
46 // HPUX 10.20 / DCE has a nonstandard pthread_mutex_init
48 #if defined(__hpux) && defined(_DECTHREADS_)
49 pthread_mutex_init( &m_, pthread_mutexattr_default );
51 pthread_mutex_init( &m_, 0 );
55 virtual ~sp_counted_base() // nothrow
57 pthread_mutex_destroy( &m_ );
60 // dispose() is called when use_count_ drops to zero, to release
61 // the resources managed by *this.
63 virtual void dispose() = 0; // nothrow
65 // destroy() is called when weak_count_ drops to zero.
67 virtual void destroy() // nothrow
72 virtual void * get_deleter( std::type_info const & ti ) = 0;
76 pthread_mutex_lock( &m_ );
78 pthread_mutex_unlock( &m_ );
81 bool add_ref_lock() // true on success
83 pthread_mutex_lock( &m_ );
84 bool r = use_count_ == 0? false: ( ++use_count_, true );
85 pthread_mutex_unlock( &m_ );
89 void release() // nothrow
91 pthread_mutex_lock( &m_ );
92 long new_use_count = --use_count_;
93 pthread_mutex_unlock( &m_ );
95 if( new_use_count == 0 )
102 void weak_add_ref() // nothrow
104 pthread_mutex_lock( &m_ );
106 pthread_mutex_unlock( &m_ );
109 void weak_release() // nothrow
111 pthread_mutex_lock( &m_ );
112 long new_weak_count = --weak_count_;
113 pthread_mutex_unlock( &m_ );
115 if( new_weak_count == 0 )
121 long use_count() const // nothrow
123 pthread_mutex_lock( &m_ );
125 pthread_mutex_unlock( &m_ );
131 } // namespace detail
135 #endif // #ifndef BOOST_DETAIL_SP_COUNTED_BASE_PT_HPP_INCLUDED