atomic.h

glibc 2.9,最新版的C语言库函数

/* Copyright (C) 2003 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Martin Schwidefsky <[e-mail]>, 2003.

   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.  */

#include <stdint.h>

typedef int8_t atomic8_t;
typedef uint8_t uatomic8_t;
typedef int_fast8_t atomic_fast8_t;
typedef uint_fast8_t uatomic_fast8_t;

typedef int16_t atomic16_t;
typedef uint16_t uatomic16_t;
typedef int_fast16_t atomic_fast16_t;
typedef uint_fast16_t uatomic_fast16_t;

typedef int32_t atomic32_t;
typedef uint32_t uatomic32_t;
typedef int_fast32_t atomic_fast32_t;
typedef uint_fast32_t uatomic_fast32_t;

typedef int64_t atomic64_t;
typedef uint64_t uatomic64_t;
typedef int_fast64_t atomic_fast64_t;
typedef uint_fast64_t uatomic_fast64_t;

typedef intptr_t atomicptr_t;
typedef uintptr_t uatomicptr_t;
typedef intmax_t atomic_max_t;
typedef uintmax_t uatomic_max_t;


#define __arch_compare_and_exchange_val_8_acq(mem, newval, oldval) \
  (abort (), (__typeof (*mem)) 0)

#define __arch_compare_and_exchange_val_16_acq(mem, newval, oldval) \
  (abort (), (__typeof (*mem)) 0)

#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
  ({ __typeof (mem) __archmem = (mem);					      \
     __typeof (*mem) __archold = (oldval);				      \
     __asm __volatile ("cs %0,%2,%1"					      \
		       : "+d" (__archold), "=Q" (*__archmem)		      \
		       : "d" (newval), "m" (*__archmem) : "cc", "memory" );	      \
     __archold; })

#ifdef __s390x__
# define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \
  ({ __typeof (mem) __archmem = (mem);					      \
     __typeof (*mem) __archold = (oldval);				      \
     __asm __volatile ("csg %0,%2,%1"					      \
		       : "+d" (__archold), "=Q" (*__archmem)		      \
		       : "d" ((long) (newval)), "m" (*__archmem) : "cc", "memory" );    \
     __archold; })
#else
/* For 31 bit we do not really need 64-bit compare-and-exchange. We can
   implement them by use of the csd instruction. The straightforward
   implementation causes warnings so we skip the definition for now.  */
# define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \
  (abort (), (__typeof (*mem)) 0)
#endif