glibc/nptl/atomic.h

/* 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 */