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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 */