138 lines
3.4 KiB
Plaintext
138 lines
3.4 KiB
Plaintext
#ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_PT_HPP_INCLUDED
|
|
#define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_PT_HPP_INCLUDED
|
|
|
|
// MS compatible compilers support #pragma once
|
|
|
|
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
|
|
# pragma once
|
|
#endif
|
|
|
|
//
|
|
// detail/sp_counted_base_pt.hpp
|
|
//
|
|
// Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd.
|
|
// Copyright 2004-2005 Peter Dimov
|
|
//
|
|
// Distributed under the Boost Software License, Version 1.0. (See
|
|
// accompanying file LICENSE_1_0.txt or copy at
|
|
// http://www.boost.org/LICENSE_1_0.txt)
|
|
//
|
|
|
|
#include <boost/detail/sp_typeinfo.hpp>
|
|
#include <boost/assert.hpp>
|
|
#include <pthread.h>
|
|
|
|
namespace boost
|
|
{
|
|
|
|
namespace detail
|
|
{
|
|
|
|
class sp_counted_base
|
|
{
|
|
private:
|
|
|
|
sp_counted_base( sp_counted_base const & );
|
|
sp_counted_base & operator= ( sp_counted_base const & );
|
|
|
|
long use_count_; // #shared
|
|
long weak_count_; // #weak + (#shared != 0)
|
|
|
|
mutable pthread_mutex_t m_;
|
|
|
|
public:
|
|
|
|
sp_counted_base(): use_count_( 1 ), weak_count_( 1 )
|
|
{
|
|
// HPUX 10.20 / DCE has a nonstandard pthread_mutex_init
|
|
|
|
#if defined(__hpux) && defined(_DECTHREADS_)
|
|
BOOST_VERIFY( pthread_mutex_init( &m_, pthread_mutexattr_default ) == 0 );
|
|
#else
|
|
BOOST_VERIFY( pthread_mutex_init( &m_, 0 ) == 0 );
|
|
#endif
|
|
}
|
|
|
|
virtual ~sp_counted_base() // nothrow
|
|
{
|
|
BOOST_VERIFY( pthread_mutex_destroy( &m_ ) == 0 );
|
|
}
|
|
|
|
// dispose() is called when use_count_ drops to zero, to release
|
|
// the resources managed by *this.
|
|
|
|
virtual void dispose() = 0; // nothrow
|
|
|
|
// destroy() is called when weak_count_ drops to zero.
|
|
|
|
virtual void destroy() // nothrow
|
|
{
|
|
delete this;
|
|
}
|
|
|
|
virtual void * get_deleter( sp_typeinfo const & ti ) = 0;
|
|
virtual void * get_untyped_deleter() = 0;
|
|
|
|
void add_ref_copy()
|
|
{
|
|
BOOST_VERIFY( pthread_mutex_lock( &m_ ) == 0 );
|
|
++use_count_;
|
|
BOOST_VERIFY( pthread_mutex_unlock( &m_ ) == 0 );
|
|
}
|
|
|
|
bool add_ref_lock() // true on success
|
|
{
|
|
BOOST_VERIFY( pthread_mutex_lock( &m_ ) == 0 );
|
|
bool r = use_count_ == 0? false: ( ++use_count_, true );
|
|
BOOST_VERIFY( pthread_mutex_unlock( &m_ ) == 0 );
|
|
return r;
|
|
}
|
|
|
|
void release() // nothrow
|
|
{
|
|
BOOST_VERIFY( pthread_mutex_lock( &m_ ) == 0 );
|
|
long new_use_count = --use_count_;
|
|
BOOST_VERIFY( pthread_mutex_unlock( &m_ ) == 0 );
|
|
|
|
if( new_use_count == 0 )
|
|
{
|
|
dispose();
|
|
weak_release();
|
|
}
|
|
}
|
|
|
|
void weak_add_ref() // nothrow
|
|
{
|
|
BOOST_VERIFY( pthread_mutex_lock( &m_ ) == 0 );
|
|
++weak_count_;
|
|
BOOST_VERIFY( pthread_mutex_unlock( &m_ ) == 0 );
|
|
}
|
|
|
|
void weak_release() // nothrow
|
|
{
|
|
BOOST_VERIFY( pthread_mutex_lock( &m_ ) == 0 );
|
|
long new_weak_count = --weak_count_;
|
|
BOOST_VERIFY( pthread_mutex_unlock( &m_ ) == 0 );
|
|
|
|
if( new_weak_count == 0 )
|
|
{
|
|
destroy();
|
|
}
|
|
}
|
|
|
|
long use_count() const // nothrow
|
|
{
|
|
BOOST_VERIFY( pthread_mutex_lock( &m_ ) == 0 );
|
|
long r = use_count_;
|
|
BOOST_VERIFY( pthread_mutex_unlock( &m_ ) == 0 );
|
|
|
|
return r;
|
|
}
|
|
};
|
|
|
|
} // namespace detail
|
|
|
|
} // namespace boost
|
|
|
|
#endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_PT_HPP_INCLUDED
|