2003-03-20 08:19:17 +01:00
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/* Copyright (C) 2003 Free Software Foundation, Inc.
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2002-12-04 01:55:29 +01:00
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This file is part of the GNU C Library.
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2003-03-20 08:19:17 +01:00
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
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2002-12-04 01:55:29 +01:00
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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2003-03-20 08:19:17 +01:00
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#ifndef _BITS_ATOMIC_H
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#define _BITS_ATOMIC_H 1
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/* We have by default no support for atomic operations. So define
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them non-atomic. If this is a problem somebody will have to come
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up with real definitions. */
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/* The only basic operation needed is compare and exchange. */
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#define arch_compare_and_exchange_acq(mem, newval, oldval) \
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({ *(mem) == (oldval) ? 1 : (*(mem) = (newval), 0); })
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#endif /* bits/atomic.h */
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