view release on metacpan or  search on metacpan

src/boost/smart_ptr/detail/sp_counted_base_cw_ppc.hpp  view on Meta::CPAN

#ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_CW_PPC_HPP_INCLUDED
#define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_CW_PPC_HPP_INCLUDED

// MS compatible compilers support #pragma once

#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif

//
//  detail/sp_counted_base_cw_ppc.hpp - CodeWarrior on PowerPC
//
//  Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd.
//  Copyright 2004-2005 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)
//
//
//  Lock-free algorithm by Alexander Terekhov
//
//  Thanks to Ben Hitchings for the #weak + (#shared != 0)
//  formulation
//

#include <boost/detail/sp_typeinfo.hpp>

namespace boost
{

namespace detail
{

inline void atomic_increment( register long * pw )
{
    register int a;

    asm
    {
loop:

    lwarx   a, 0, pw
    addi    a, a, 1
    stwcx.  a, 0, pw
    bne-    loop
    }
}

inline long atomic_decrement( register long * pw )
{
    register int a;

    asm
    {
    sync

loop:

    lwarx   a, 0, pw
    addi    a, a, -1
    stwcx.  a, 0, pw
    bne-    loop

    isync
    }

    return a;
}

inline long atomic_conditional_increment( register long * pw )
{
    register int a;

    asm
    {
loop:

    lwarx   a, 0, pw
    cmpwi   a, 0
    beq     store

    addi    a, a, 1