1 #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_PT_HPP_INCLUDED
2 #define BOOST_SMART_PTR_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)
21 #include <boost/smart_ptr/detail/sp_typeinfo_.hpp>
22 #include <boost/assert.hpp>
23 #include <boost/config.hpp>
24 #include <boost/cstdint.hpp>
33 class BOOST_SYMBOL_VISIBLE sp_counted_base
37 sp_counted_base( sp_counted_base const & );
38 sp_counted_base & operator= ( sp_counted_base const & );
40 boost::int_least32_t use_count_; // #shared
41 boost::int_least32_t weak_count_; // #weak + (#shared != 0)
43 mutable pthread_mutex_t m_;
47 sp_counted_base(): use_count_( 1 ), weak_count_( 1 )
49 // HPUX 10.20 / DCE has a nonstandard pthread_mutex_init
51 #if defined(__hpux) && defined(_DECTHREADS_)
52 BOOST_VERIFY( pthread_mutex_init( &m_, pthread_mutexattr_default ) == 0 );
54 BOOST_VERIFY( pthread_mutex_init( &m_, 0 ) == 0 );
58 virtual ~sp_counted_base() // nothrow
60 BOOST_VERIFY( pthread_mutex_destroy( &m_ ) == 0 );
63 // dispose() is called when use_count_ drops to zero, to release
64 // the resources managed by *this.
66 virtual void dispose() = 0; // nothrow
68 // destroy() is called when weak_count_ drops to zero.
70 virtual void destroy() // nothrow
75 virtual void * get_deleter( sp_typeinfo_ const & ti ) = 0;
76 virtual void * get_local_deleter( sp_typeinfo_ const & ti ) = 0;
77 virtual void * get_untyped_deleter() = 0;
81 BOOST_VERIFY( pthread_mutex_lock( &m_ ) == 0 );
83 BOOST_VERIFY( pthread_mutex_unlock( &m_ ) == 0 );
86 bool add_ref_lock() // true on success
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 );
94 void release() // nothrow
96 BOOST_VERIFY( pthread_mutex_lock( &m_ ) == 0 );
97 boost::int_least32_t new_use_count = --use_count_;
98 BOOST_VERIFY( pthread_mutex_unlock( &m_ ) == 0 );
100 if( new_use_count == 0 )
107 void weak_add_ref() // nothrow
109 BOOST_VERIFY( pthread_mutex_lock( &m_ ) == 0 );
111 BOOST_VERIFY( pthread_mutex_unlock( &m_ ) == 0 );
114 void weak_release() // nothrow
116 BOOST_VERIFY( pthread_mutex_lock( &m_ ) == 0 );
117 boost::int_least32_t new_weak_count = --weak_count_;
118 BOOST_VERIFY( pthread_mutex_unlock( &m_ ) == 0 );
120 if( new_weak_count == 0 )
126 long use_count() const // nothrow
128 BOOST_VERIFY( pthread_mutex_lock( &m_ ) == 0 );
129 boost::int_least32_t r = use_count_;
130 BOOST_VERIFY( pthread_mutex_unlock( &m_ ) == 0 );
136 } // namespace detail
140 #endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_PT_HPP_INCLUDED