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include/boost/detail/sp_counted_base_gcc_ppc.hpp  view on Meta::CPAN

#ifndef BOOST_DETAIL_SP_COUNTED_BASE_GCC_PPC_HPP_INCLUDED
#define BOOST_DETAIL_SP_COUNTED_BASE_GCC_PPC_HPP_INCLUDED

// MS compatible compilers support #pragma once

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

//
//  detail/sp_counted_base_gcc_ppc.hpp - g++ 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 <typeinfo>

namespace boost
{

namespace detail
{

inline void atomic_increment( long * pw )
{
    // ++*pw;

    long tmp;

    __asm__
    (
        "0:\n\t"
        "lwarx %1, 0, %2\n\t"
        "addi %1, %1, 1\n\t"
        "stwcx. %1, 0, %2\n\t"
        "bne- 0b":

        "=m"( *pw ), "=&b"( tmp ):
        "r"( pw ):
        "cc"
    );
}

inline long atomic_decrement( long * pw )
{
    // return --*pw;

    long rv;

    __asm__ __volatile__
    (
        "sync\n\t"
        "0:\n\t"
        "lwarx %1, 0, %2\n\t"
        "addi %1, %1, -1\n\t"
        "stwcx. %1, 0, %2\n\t"
        "bne- 0b\n\t"
        "isync":

        "=m"( *pw ), "=&b"( rv ):
        "r"( pw ):
        "memory", "cc"
    );

    return rv;
}

inline long atomic_conditional_increment( long * pw )
{
    // if( *pw != 0 ) ++*pw;
    // return *pw;

    long rv;