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/* Copyright (C) 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#ifndef _ATOMIC_H
#define _ATOMIC_H 1
#include <stdlib.h>
#include <bits/atomic.h>
#ifndef atomic_compare_and_exchange_acq
# define atomic_compare_and_exchange_acq(mem, newval, oldval) \
({ __typeof (__arch_compare_and_exchange_8_acq (mem, newval, oldval)) \
__result; \
if (sizeof (*mem) == 1) \
__result = __arch_compare_and_exchange_8_acq (mem, newval, oldval); \
else if (sizeof (*mem) == 2) \
__result = __arch_compare_and_exchange_16_acq (mem, newval, oldval); \
else if (sizeof (*mem) == 4) \
__result = __arch_compare_and_exchange_32_acq (mem, newval, oldval); \
else if (sizeof (*mem) == 8) \
__result = __arch_compare_and_exchange_64_acq (mem, newval, oldval); \
else \
abort (); \
__result; })
#endif
#ifndef atomic_compare_and_exchange_rel
# define atomic_compare_and_exchange_rel(mem, oldval, newval) \
compare_and_exchange_acq (mem, oldval, newval)
#endif
#ifndef atomic_exchange_and_add
# define atomic_exchange_and_add(mem, value) \
({ __typeof (*mem) __oldval; \
__typeof (mem) __memp = (mem); \
__typeof (*mem) __value = (value); \
\
do \
__oldval = (*__memp); \
while (compare_and_exchange_acq (__memp, __oldval + __value, __oldval)); \
\
__value; })
#endif
#ifndef atomic_add
# define atomic_add(mem, value) (void) exchange_and_add (mem, value)
#endif
#ifndef atomic_increment
# define atomic_increment(mem) atomic_add (mem, 1)
#endif
#ifndef atomic_decrement
# define atomic_decrement(mem) atomic_add (mem, -1)
#endif
#ifndef atomic_set_bit
# define atomic_set_bit(mem, bit) \
(void) ({ __typeof (mem) __memp = (mem); \
while (1) \
{ \
__typeof (*mem) __oldval = *__memp; \
\
if (compare_and_exchange_acq (__memp, __oldval | 1 << bit, \
__oldval) == 0) \
break; \
}})
#endif
#ifndef atomic_full_barrier
# define full_barrier() __asm ("" ::: "memory")
#endif
#ifndef atomic_read_barrier
# define read_barrier() full_barrier()
#endif
#ifndef atomic_write_barrier
# define write_barrier() full_barrier()
#endif
#endif /* atomic.h */
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