Update of /cvsroot/boost/boost/boost/detail
In directory sc8-pr-cvs3.sourceforge.net:/tmp/cvs-serv8562/boost/detail
Modified Files:
sp_counted_base.hpp
Added Files:
sp_counted_base_sync.hpp
Log Message:
Use __sync intrinsics on g++ 4.1+
--- NEW FILE: sp_counted_base_sync.hpp ---
#ifndef BOOST_DETAIL_SP_COUNTED_BASE_SYNC_HPP_INCLUDED
#define BOOST_DETAIL_SP_COUNTED_BASE_SYNC_HPP_INCLUDED
// MS compatible compilers support #pragma once
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif
// detail/sp_counted_base_sync.hpp - g++ 4.1+ __sync intrinsics
//
// Copyright (c) 2007 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 <typeinfo>
#include <limits.h>
namespace boost
{
namespace detail
{
#if INT_MAX >= 2147483647
typedef int sp_int32_t;
#else
typedef long sp_int32_t;
#endif
inline void atomic_increment( sp_int32_t * pw )
{
__sync_fetch_and_add( pw, 1 );
}
inline sp_int32_t atomic_decrement( sp_int32_t * pw )
{
return __sync_fetch_and_add( pw, -1 );
}
inline sp_int32_t atomic_conditional_increment( sp_int32_t * pw )
{
// long r = *pw;
// if( r != 0 ) ++*pw;
// return r;
sp_int32_t r = *pw;
for( ;; )
{
if( r == 0 )
{
return r;
}
sp_int32_t r2 = __sync_val_compare_and_swap( pw, r, r + 1 );
if( r2 == r )
{
return r;
}
else
{
r = r2;
}
}
}
class sp_counted_base
{
private:
sp_counted_base( sp_counted_base const & );
sp_counted_base & operator= ( sp_counted_base const & );
sp_int32_t use_count_; // #shared
sp_int32_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( std::type_info 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_ ) == 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 const_cast< sp_int32_t const volatile & >( use_count_ );
}
};
} // namespace detail
} // namespace boost
#endif // #ifndef BOOST_DETAIL_SP_COUNTED_BASE_SYNC_HPP_INCLUDED
Index: sp_counted_base.hpp
===================================================================
RCS file: /cvsroot/boost/boost/boost/detail/sp_counted_base.hpp,v
retrieving revision 1.9
retrieving revision 1.10
diff -u -d -r1.9 -r1.10
--- sp_counted_base.hpp 8 Jul 2006 17:44:55 -0000 1.9
+++ sp_counted_base.hpp 28 Apr 2007 18:13:12 -0000 1.10
@@ -47,6 +47,10 @@
# include <boost/detail/sp_counted_base_gcc_ppc.hpp>
+#elif defined(__GNUC__) && ( __GNUC__ * 100 + __GNUC_MINOR__ >= 401 )
+
+# include <boost/detail/sp_counted_base_sync.hpp>
+
#elif defined(__GNUC__) && ( defined( __sparcv8 ) || defined( __sparcv9 ) )
# include <boost/detail/sp_counted_base_gcc_sparc.hpp>
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