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#ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_GCC_SPARC_HPP_INCLUDED
#define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_GCC_SPARC_HPP_INCLUDED
// MS compatible compilers support #pragma once
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif
// detail/sp_counted_base_gcc_sparc.hpp - g++ on Sparc V8+
//
// Copyright (c) 2006 Piotr Wyderski
// Copyright (c) 2006 Tomas Puverle
// Copyright (c) 2006 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
//
// Thanks to Michael van der Westhuizen
#include <boost/detail/sp_typeinfo.hpp>
#include <inttypes.h> // int32_t
namespace boost
{
namespace detail
{
inline int32_t compare_and_swap( int32_t * dest_, int32_t compare_, int32_t swap_ )
{
__asm__ __volatile__( "cas [%1], %2, %0"
: "+r" (swap_)
: "r" (dest_), "r" (compare_)
: "memory" );
return swap_;
}
inline int32_t atomic_fetch_and_add( int32_t * pw, int32_t dv )
{
// long r = *pw;
// *pw += dv;
// return r;
for( ;; )
{
int32_t r = *pw;
if( __builtin_expect((compare_and_swap(pw, r, r + dv) == r), 1) )
{
return r;
}
}
}
inline void atomic_increment( int32_t * pw )
{
atomic_fetch_and_add( pw, 1 );
}
inline int32_t atomic_decrement( int32_t * pw )
{
return atomic_fetch_and_add( pw, -1 );
}
inline int32_t atomic_conditional_increment( int32_t * pw )
{
// long r = *pw;
// if( r != 0 ) ++*pw;
// return r;
for( ;; )
{
int32_t r = *pw;
if( r == 0 )
{
return r;
}
if( __builtin_expect( ( compare_and_swap( pw, r, r + 1 ) == r ), 1 ) )
{
return r;
}
}
}
class sp_counted_base
{
private:
sp_counted_base( sp_counted_base const & );
sp_counted_base & operator= ( sp_counted_base const & );
int32_t use_count_; // #shared
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( 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 const_cast< int32_t const volatile & >( use_count_ );
}
};
} // namespace detail
} // namespace boost
#endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_GCC_SPARC_HPP_INCLUDED
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