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// Low-level functions for atomic operations: Generic version -*- C++ -*-
// Copyright (C) 1999, 2001, 2002, 2003 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library 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, or (at your option)
// any later version.
// This library 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 library; see the file COPYING. If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
#ifndef _BITS_ATOMICITY_H
#define _BITS_ATOMICITY_H 1
#include <bits/gthr.h>
#define _GLIBCPP_NEED_GENERIC_MUTEX
typedef int _Atomic_word;
namespace __gnu_cxx
{
extern __gthread_mutex_t _Atomic_add_mutex;
#ifndef __GTHREAD_MUTEX_INIT
extern __gthread_once_t _Atomic_add_mutex_once;
extern void __gthread_atomic_add_mutex_once();
#endif
}
static inline _Atomic_word
__attribute__ ((__unused__))
__exchange_and_add (volatile _Atomic_word* __mem, int __val)
{
#ifndef __GTHREAD_MUTEX_INIT
__gthread_once (&__gnu_cxx::_Atomic_add_mutex_once,
__gnu_cxx::__gthread_atomic_add_mutex_once);
#endif
_Atomic_word __result;
__gthread_mutex_lock (&__gnu_cxx::_Atomic_add_mutex);
__result = *__mem;
*__mem += __val;
__gthread_mutex_unlock (&__gnu_cxx::_Atomic_add_mutex);
return __result;
}
static inline void
__attribute__ ((__unused__))
__atomic_add (volatile _Atomic_word* __mem, int __val)
{
(void) __exchange_and_add (__mem, __val);
}
#endif /* atomicity.h */
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