diff options
Diffstat (limited to 'contrib/src/boost/smart_ptr/detail/sp_counted_base_std_atomic.hpp')
-rw-r--r-- | contrib/src/boost/smart_ptr/detail/sp_counted_base_std_atomic.hpp | 274 |
1 files changed, 137 insertions, 137 deletions
diff --git a/contrib/src/boost/smart_ptr/detail/sp_counted_base_std_atomic.hpp b/contrib/src/boost/smart_ptr/detail/sp_counted_base_std_atomic.hpp index 8743536..cab8453 100644 --- a/contrib/src/boost/smart_ptr/detail/sp_counted_base_std_atomic.hpp +++ b/contrib/src/boost/smart_ptr/detail/sp_counted_base_std_atomic.hpp @@ -1,137 +1,137 @@ -#ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_STD_ATOMIC_HPP_INCLUDED
-#define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_STD_ATOMIC_HPP_INCLUDED
-
-// MS compatible compilers support #pragma once
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1020)
-# pragma once
-#endif
-
-// detail/sp_counted_base_std_atomic.hpp - C++11 std::atomic
-//
-// Copyright (c) 2007, 2013 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 <atomic>
-#include <cstdint>
-
-namespace boost
-{
-
-namespace detail
-{
-
-inline void atomic_increment( std::atomic_int_least32_t * pw )
-{
- pw->fetch_add( 1, std::memory_order_relaxed );
-}
-
-inline std::int_least32_t atomic_decrement( std::atomic_int_least32_t * pw )
-{
- return pw->fetch_sub( 1, std::memory_order_acq_rel );
-}
-
-inline std::int_least32_t atomic_conditional_increment( std::atomic_int_least32_t * pw )
-{
- // long r = *pw;
- // if( r != 0 ) ++*pw;
- // return r;
-
- std::int_least32_t r = pw->load( std::memory_order_relaxed );
-
- for( ;; )
- {
- if( r == 0 )
- {
- return r;
- }
-
- if( pw->compare_exchange_weak( r, r + 1, std::memory_order_relaxed, std::memory_order_relaxed ) )
- {
- return r;
- }
- }
-}
-
-class sp_counted_base
-{
-private:
-
- sp_counted_base( sp_counted_base const & );
- sp_counted_base & operator= ( sp_counted_base const & );
-
- std::atomic_int_least32_t use_count_; // #shared
- std::atomic_int_least32_t 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_decrement( &use_count_ ) == 1 )
- {
- dispose();
- weak_release();
- }
- }
-
- void weak_add_ref() // nothrow
- {
- atomic_increment( &weak_count_ );
- }
-
- void weak_release() // nothrow
- {
- if( atomic_decrement( &weak_count_ ) == 1 )
- {
- destroy();
- }
- }
-
- long use_count() const // nothrow
- {
- return use_count_.load( std::memory_order_acquire );
- }
-};
-
-} // namespace detail
-
-} // namespace boost
-
-#endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_STD_ATOMIC_HPP_INCLUDED
+#ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_STD_ATOMIC_HPP_INCLUDED +#define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_STD_ATOMIC_HPP_INCLUDED + +// MS compatible compilers support #pragma once + +#if defined(_MSC_VER) && (_MSC_VER >= 1020) +# pragma once +#endif + +// detail/sp_counted_base_std_atomic.hpp - C++11 std::atomic +// +// Copyright (c) 2007, 2013 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 <atomic> +#include <cstdint> + +namespace boost +{ + +namespace detail +{ + +inline void atomic_increment( std::atomic_int_least32_t * pw ) +{ + pw->fetch_add( 1, std::memory_order_relaxed ); +} + +inline std::int_least32_t atomic_decrement( std::atomic_int_least32_t * pw ) +{ + return pw->fetch_sub( 1, std::memory_order_acq_rel ); +} + +inline std::int_least32_t atomic_conditional_increment( std::atomic_int_least32_t * pw ) +{ + // long r = *pw; + // if( r != 0 ) ++*pw; + // return r; + + std::int_least32_t r = pw->load( std::memory_order_relaxed ); + + for( ;; ) + { + if( r == 0 ) + { + return r; + } + + if( pw->compare_exchange_weak( r, r + 1, std::memory_order_relaxed, std::memory_order_relaxed ) ) + { + return r; + } + } +} + +class sp_counted_base +{ +private: + + sp_counted_base( sp_counted_base const & ); + sp_counted_base & operator= ( sp_counted_base const & ); + + std::atomic_int_least32_t use_count_; // #shared + std::atomic_int_least32_t 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_decrement( &use_count_ ) == 1 ) + { + dispose(); + weak_release(); + } + } + + void weak_add_ref() // nothrow + { + atomic_increment( &weak_count_ ); + } + + void weak_release() // nothrow + { + if( atomic_decrement( &weak_count_ ) == 1 ) + { + destroy(); + } + } + + long use_count() const // nothrow + { + return use_count_.load( std::memory_order_acquire ); + } +}; + +} // namespace detail + +} // namespace boost + +#endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_STD_ATOMIC_HPP_INCLUDED |