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/* Copyright (C) 2003-2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<https://www.gnu.org/licenses/>. */
#ifndef _ATOMIC_MACHINE_H
#define _ATOMIC_MACHINE_H 1
/* If we have just non-atomic operations, we can as well make them wide. */
#define __HAVE_64B_ATOMICS 1
#define USE_ATOMIC_COMPILER_BUILTINS 0
/* XXX Is this actually correct? */
#define ATOMIC_EXCHANGE_USES_CAS 1
/* The only basic operation needed is compare and exchange. */
#define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
({ __typeof (mem) __gmemp = (mem); \
__typeof (*mem) __gret = *__gmemp; \
__typeof (*mem) __gnewval = (newval); \
\
if (__gret == (oldval)) \
*__gmemp = __gnewval; \
__gret; })
#define atomic_compare_and_exchange_bool_acq(mem, newval, oldval) \
({ __typeof (mem) __gmemp = (mem); \
__typeof (*mem) __gnewval = (newval); \
\
*__gmemp == (oldval) ? (*__gmemp = __gnewval, 0) : 1; })
#endif
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