diff options
Diffstat (limited to 'contrib/src/boost/smart_ptr/detail/sp_counted_base_spin.hpp')
| -rw-r--r-- | contrib/src/boost/smart_ptr/detail/sp_counted_base_spin.hpp | 264 |
1 files changed, 132 insertions, 132 deletions
diff --git a/contrib/src/boost/smart_ptr/detail/sp_counted_base_spin.hpp b/contrib/src/boost/smart_ptr/detail/sp_counted_base_spin.hpp index c8fbb6d..77734e7 100644 --- a/contrib/src/boost/smart_ptr/detail/sp_counted_base_spin.hpp +++ b/contrib/src/boost/smart_ptr/detail/sp_counted_base_spin.hpp @@ -1,132 +1,132 @@ -#ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_SPIN_HPP_INCLUDED
-#define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_SPIN_HPP_INCLUDED
-
-// MS compatible compilers support #pragma once
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1020)
-# pragma once
-#endif
-
-//
-// detail/sp_counted_base_spin.hpp - spinlock pool atomic emulation
-//
-// Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd.
-// Copyright 2004-2008 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/smart_ptr/detail/spinlock_pool.hpp>
-
-namespace boost
-{
-
-namespace detail
-{
-
-inline int atomic_exchange_and_add( int * pw, int dv )
-{
- spinlock_pool<1>::scoped_lock lock( pw );
-
- int r = *pw;
- *pw += dv;
- return r;
-}
-
-inline void atomic_increment( int * pw )
-{
- spinlock_pool<1>::scoped_lock lock( pw );
- ++*pw;
-}
-
-inline int atomic_conditional_increment( int * pw )
-{
- spinlock_pool<1>::scoped_lock lock( pw );
-
- int rv = *pw;
- if( rv != 0 ) ++*pw;
- return rv;
-}
-
-class sp_counted_base
-{
-private:
-
- sp_counted_base( sp_counted_base const & );
- sp_counted_base & operator= ( sp_counted_base const & );
-
- int use_count_; // #shared
- int weak_count_; // #weak + (#shared != 0)
-
-public:
-
- sp_counted_base(): use_count_( 1 ), weak_count_( 1 )
- {
- }
-
- virtual ~sp_counted_base() // nothrow
- {
- }
-
- // 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()
- {
- atomic_increment( &use_count_ );
- }
-
- bool add_ref_lock() // true on success
- {
- return atomic_conditional_increment( &use_count_ ) != 0;
- }
-
- void release() // nothrow
- {
- if( atomic_exchange_and_add( &use_count_, -1 ) == 1 )
- {
- dispose();
- weak_release();
- }
- }
-
- void weak_add_ref() // nothrow
- {
- atomic_increment( &weak_count_ );
- }
-
- void weak_release() // nothrow
- {
- if( atomic_exchange_and_add( &weak_count_, -1 ) == 1 )
- {
- destroy();
- }
- }
-
- long use_count() const // nothrow
- {
- spinlock_pool<1>::scoped_lock lock( &use_count_ );
- return use_count_;
- }
-};
-
-} // namespace detail
-
-} // namespace boost
-
-#endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_SPIN_HPP_INCLUDED
+#ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_SPIN_HPP_INCLUDED +#define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_SPIN_HPP_INCLUDED + +// MS compatible compilers support #pragma once + +#if defined(_MSC_VER) && (_MSC_VER >= 1020) +# pragma once +#endif + +// +// detail/sp_counted_base_spin.hpp - spinlock pool atomic emulation +// +// Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd. +// Copyright 2004-2008 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/smart_ptr/detail/spinlock_pool.hpp> + +namespace boost +{ + +namespace detail +{ + +inline int atomic_exchange_and_add( int * pw, int dv ) +{ + spinlock_pool<1>::scoped_lock lock( pw ); + + int r = *pw; + *pw += dv; + return r; +} + +inline void atomic_increment( int * pw ) +{ + spinlock_pool<1>::scoped_lock lock( pw ); + ++*pw; +} + +inline int atomic_conditional_increment( int * pw ) +{ + spinlock_pool<1>::scoped_lock lock( pw ); + + int rv = *pw; + if( rv != 0 ) ++*pw; + return rv; +} + +class sp_counted_base +{ +private: + + sp_counted_base( sp_counted_base const & ); + sp_counted_base & operator= ( sp_counted_base const & ); + + int use_count_; // #shared + int weak_count_; // #weak + (#shared != 0) + +public: + + sp_counted_base(): use_count_( 1 ), weak_count_( 1 ) + { + } + + virtual ~sp_counted_base() // nothrow + { + } + + // 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() + { + atomic_increment( &use_count_ ); + } + + bool add_ref_lock() // true on success + { + return atomic_conditional_increment( &use_count_ ) != 0; + } + + void release() // nothrow + { + if( atomic_exchange_and_add( &use_count_, -1 ) == 1 ) + { + dispose(); + weak_release(); + } + } + + void weak_add_ref() // nothrow + { + atomic_increment( &weak_count_ ); + } + + void weak_release() // nothrow + { + if( atomic_exchange_and_add( &weak_count_, -1 ) == 1 ) + { + destroy(); + } + } + + long use_count() const // nothrow + { + spinlock_pool<1>::scoped_lock lock( &use_count_ ); + return use_count_; + } +}; + +} // namespace detail + +} // namespace boost + +#endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_SPIN_HPP_INCLUDED |