diff options
Diffstat (limited to 'contrib/src/boost/smart_ptr/detail/sp_counted_base_vacpp_ppc.hpp')
-rw-r--r-- | contrib/src/boost/smart_ptr/detail/sp_counted_base_vacpp_ppc.hpp | 302 |
1 files changed, 151 insertions, 151 deletions
diff --git a/contrib/src/boost/smart_ptr/detail/sp_counted_base_vacpp_ppc.hpp b/contrib/src/boost/smart_ptr/detail/sp_counted_base_vacpp_ppc.hpp index 162f309..d59f3c5 100644 --- a/contrib/src/boost/smart_ptr/detail/sp_counted_base_vacpp_ppc.hpp +++ b/contrib/src/boost/smart_ptr/detail/sp_counted_base_vacpp_ppc.hpp @@ -1,151 +1,151 @@ -#ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_VACPP_PPC_HPP_INCLUDED -#define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_VACPP_PPC_HPP_INCLUDED - -// -// detail/sp_counted_base_vacpp_ppc.hpp - xlC(vacpp) on POWER -// based on: detail/sp_counted_base_w32.hpp -// -// Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd. -// Copyright 2004-2005 Peter Dimov -// Copyright 2006 Michael van der Westhuizen -// Copyright 2012 IBM Corp. -// -// 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) -// -// -// Lock-free algorithm by Alexander Terekhov -// -// Thanks to Ben Hitchings for the #weak + (#shared != 0) -// formulation -// - -#include <boost/detail/sp_typeinfo.hpp> - -extern "builtin" void __lwsync(void); -extern "builtin" void __isync(void); -extern "builtin" int __fetch_and_add(volatile int* addr, int val); -extern "builtin" int __compare_and_swap(volatile int*, int*, int); - -namespace boost -{ - -namespace detail -{ - -inline void atomic_increment( int *pw ) -{ - // ++*pw; - __lwsync(); - __fetch_and_add(pw, 1); - __isync(); -} - -inline int atomic_decrement( int *pw ) -{ - // return --*pw; - __lwsync(); - int originalValue = __fetch_and_add(pw, -1); - __isync(); - - return (originalValue - 1); -} - -inline int atomic_conditional_increment( int *pw ) -{ - // if( *pw != 0 ) ++*pw; - // return *pw; - - __lwsync(); - int v = *const_cast<volatile int*>(pw); - for (;;) - // loop until state is known - { - if (v == 0) return 0; - if (__compare_and_swap(pw, &v, v + 1)) - { - __isync(); return (v + 1); - } - } -} - -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) - char pad[64] __attribute__((__aligned__(64))); - // pad to prevent false sharing -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_ ) == 0 ) - { - dispose(); - weak_release(); - } - } - - void weak_add_ref() // nothrow - { - atomic_increment( &weak_count_ ); - } - - void weak_release() // nothrow - { - if( atomic_decrement( &weak_count_ ) == 0 ) - { - destroy(); - } - } - - long use_count() const // nothrow - { - return *const_cast<volatile int*>(&use_count_); - } -}; - -} // namespace detail - -} // namespace boost - -#endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_VACPP_PPC_HPP_INCLUDED +#ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_VACPP_PPC_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_VACPP_PPC_HPP_INCLUDED
+
+//
+// detail/sp_counted_base_vacpp_ppc.hpp - xlC(vacpp) on POWER
+// based on: detail/sp_counted_base_w32.hpp
+//
+// Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd.
+// Copyright 2004-2005 Peter Dimov
+// Copyright 2006 Michael van der Westhuizen
+// Copyright 2012 IBM Corp.
+//
+// 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)
+//
+//
+// Lock-free algorithm by Alexander Terekhov
+//
+// Thanks to Ben Hitchings for the #weak + (#shared != 0)
+// formulation
+//
+
+#include <boost/detail/sp_typeinfo.hpp>
+
+extern "builtin" void __lwsync(void);
+extern "builtin" void __isync(void);
+extern "builtin" int __fetch_and_add(volatile int* addr, int val);
+extern "builtin" int __compare_and_swap(volatile int*, int*, int);
+
+namespace boost
+{
+
+namespace detail
+{
+
+inline void atomic_increment( int *pw )
+{
+ // ++*pw;
+ __lwsync();
+ __fetch_and_add(pw, 1);
+ __isync();
+}
+
+inline int atomic_decrement( int *pw )
+{
+ // return --*pw;
+ __lwsync();
+ int originalValue = __fetch_and_add(pw, -1);
+ __isync();
+
+ return (originalValue - 1);
+}
+
+inline int atomic_conditional_increment( int *pw )
+{
+ // if( *pw != 0 ) ++*pw;
+ // return *pw;
+
+ __lwsync();
+ int v = *const_cast<volatile int*>(pw);
+ for (;;)
+ // loop until state is known
+ {
+ if (v == 0) return 0;
+ if (__compare_and_swap(pw, &v, v + 1))
+ {
+ __isync(); return (v + 1);
+ }
+ }
+}
+
+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)
+ char pad[64] __attribute__((__aligned__(64)));
+ // pad to prevent false sharing
+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_ ) == 0 )
+ {
+ dispose();
+ weak_release();
+ }
+ }
+
+ void weak_add_ref() // nothrow
+ {
+ atomic_increment( &weak_count_ );
+ }
+
+ void weak_release() // nothrow
+ {
+ if( atomic_decrement( &weak_count_ ) == 0 )
+ {
+ destroy();
+ }
+ }
+
+ long use_count() const // nothrow
+ {
+ return *const_cast<volatile int*>(&use_count_);
+ }
+};
+
+} // namespace detail
+
+} // namespace boost
+
+#endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_VACPP_PPC_HPP_INCLUDED
|