arch/ia32/include/atomic.h

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/*
 *  Copyright (C) 2003 Bregmasoft
 * 
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any later
 * version.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE. See the GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place, Suite 330, Boston, MA 02111-1307 USA
 */
#ifndef ZYGOMA_IA32_ATOMIC_H_ 
#define ZYGOMA_IA32_ATOMIC_H_ 

#include "config.h"

namespace Zygoma
{
  namespace ia32
  {
    typedef int AtomicWord;


    ZYGOMA_ALWAYS_INLINE AtomicWord 
    atomicExchange(volatile AtomicWord* mem, int value)
    {
      register AtomicWord result;
      ZYGOMA_ASM("xchg{l} %[mem], %[result]"
                : [result] "=&r" (result), [mem] "=m" (*mem)
                : "0" (value)
                : "memory");
      return result;
    }


    ZYGOMA_ALWAYS_INLINE AtomicWord 
    atomicExchangeAndAdd(volatile AtomicWord* mem, int value)
    {
      register AtomicWord result;
      ZYGOMA_ASM("lock xadd{l} %[result], %[mem]"
                : [result] "=&r" (result), [mem] "=m" (*mem)
                :"0" (value)
                : "memory");
      return result;
    }


    ZYGOMA_ALWAYS_INLINE void 
    atomicAdd(volatile AtomicWord* mem, int value)
    {
      ZYGOMA_ASM("lock add{l} %[value],%[mem]"
                : [mem] "=m" (*mem)
                : [value] "ir" (value)
                : "memory");
    }

  } // namespace ia32
} // namespace Zygoma

#endif // ZYGOMA_IA32_ATOMIC_H_ 

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