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 cab8453..8743536 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
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