From: Boris.Gubenko_at_[hidden]
Date: 2007-10-30 08:48:44
Author: bgubenko
Date: 2007-10-30 08:48:44 EDT (Tue, 30 Oct 2007)
New Revision: 40604
URL: http://svn.boost.org/trac/boost/changeset/40604
Log:
add support for aC++ on HP-UX ia64
Added:
trunk/boost/detail/sp_counted_base_acc_ia64.hpp (contents, props changed)
Added: trunk/boost/detail/sp_counted_base_acc_ia64.hpp
==============================================================================
--- (empty file)
+++ trunk/boost/detail/sp_counted_base_acc_ia64.hpp 2007-10-30 08:48:44 EDT (Tue, 30 Oct 2007)
@@ -0,0 +1,150 @@
+#ifndef BOOST_DETAIL_SP_COUNTED_BASE_ACC_IA64_HPP_INCLUDED
+#define BOOST_DETAIL_SP_COUNTED_BASE_ACC_IA64_HPP_INCLUDED
+
+//
+// detail/sp_counted_base_gcc_ia64.hpp - aC++ on HP-UX IA64
+//
+// Copyright 2007 Baruch Zilber
+// Copyright 2007 Boris Gubenko
+//
+// 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
+//
+
+#include "sp_typeinfo.hpp"
+#include <machine/sys/inline.h>
+
+namespace boost
+{
+
+namespace detail
+{
+
+inline void atomic_increment( int * pw )
+{
+ // ++*pw;
+
+ _Asm_fetchadd(_FASZ_W, _SEM_REL, pw, +1, _LDHINT_NONE);
+}
+
+inline int atomic_decrement( int * pw )
+{
+ // return --*pw;
+
+ int r = static_cast<int>(_Asm_fetchadd(_FASZ_W, _SEM_REL, pw, -1, _LDHINT_NONE));
+ if (1 == r)
+ {
+ _Asm_mf();
+ }
+
+ return r - 1;
+}
+
+inline int atomic_conditional_increment( int * pw )
+{
+ // if( *pw != 0 ) ++*pw;
+ // return *pw;
+
+ int v = *pw;
+
+ for (;;)
+ {
+ if (0 == v)
+ {
+ return 0;
+ }
+
+ _Asm_mov_to_ar(_AREG_CCV,
+ v,
+ (_UP_CALL_FENCE | _UP_SYS_FENCE | _DOWN_CALL_FENCE | _DOWN_SYS_FENCE));
+ int r = static_cast<int>(_Asm_cmpxchg(_SZ_W, _SEM_ACQ, pw, v + 1, _LDHINT_NONE));
+ if (r == v)
+ {
+ return r + 1;
+ }
+
+ v = r;
+ }
+}
+
+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;
+
+ 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 static_cast<int const volatile &>( use_count_ ); // TODO use ld.acq here
+ }
+};
+
+} // namespace detail
+
+} // namespace boost
+
+#endif // #ifndef BOOST_DETAIL_SP_COUNTED_BASE_ACC_IA64_HPP_INCLUDED