55 lines
2.0 KiB
C++
55 lines
2.0 KiB
C++
// Low-level functions for atomic operations: x86, x >= 4 version -*- C++ -*-
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// Copyright (C) 1999, 2000, 2001, 2004, 2005 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 2, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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#include <bits/atomicity.h>
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_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
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_Atomic_word
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__attribute__ ((__unused__))
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__exchange_and_add(volatile _Atomic_word* __mem, int __val)
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{
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register _Atomic_word __result;
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__asm__ __volatile__ ("lock; xadd{l} {%0,%1|%1,%0}"
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: "=r" (__result), "=m" (*__mem)
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: "0" (__val), "m" (*__mem));
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return __result;
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}
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void
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__attribute__ ((__unused__))
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__atomic_add(volatile _Atomic_word* __mem, int __val)
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{
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__asm__ __volatile__ ("lock; add{l} {%1,%0|%0,%1}"
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: "=m" (*__mem) : "ir" (__val), "m" (*__mem));
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}
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_GLIBCXX_END_NAMESPACE
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