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// Low-level functions for atomic operations: Generic version -*- C++ -*-
// Copyright (C) 1999, 2001, 2002, 2003, 2004, 2005, 2006
// 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
// 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.
/** @file ext/atomicity.h
* This file is a GNU extension to the Standard C++ Library.
*/
#include <ext/atomicity.h>
#include <ext/concurrence.h>
namespace
{
__gnu_cxx::__mutex atomic_mutex;
} // anonymous namespace
_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
_Atomic_word
__attribute__ ((__unused__))
__exchange_and_add(volatile _Atomic_word* __mem, int __val)
{
__gnu_cxx::__scoped_lock sentry(atomic_mutex);
_Atomic_word __result;
__result = *__mem;
*__mem += __val;
return __result;
}
void
__attribute__ ((__unused__))
__atomic_add(volatile _Atomic_word* __mem, int __val)
{ __exchange_and_add(__mem, __val); }
_GLIBCXX_END_NAMESPACE
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