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2000-04-24 Nathan Myers <ncm@cantrip.org> * config/cpu: Atomicity cleanups. * config/cpu/alpha/bits: New directory. * config/cpu/arm/bits: New directory. * config/cpu/generic/bits: New directory. * config/cpu/i386/bits: New directory. * config/cpu/powerpc/bits: New directory. * config/cpu/sparc/sparc32/bits: New directory. * config/cpu/sparc/sparc32/bits: New directory. * config/cpu/*/bits: Move atomicity.h files to here. From-SVN: r33438
59 lines
1.9 KiB
C
59 lines
1.9 KiB
C
/* Low-level functions for atomic operations. ix86 version, x >= 4.
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Copyright (C) 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef _BITS_ATOMICITY_H
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#define _BITS_ATOMICITY_H 1
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typedef int _Atomic_word;
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static inline _Atomic_word
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__attribute__ ((unused))
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__exchange_and_add (volatile _Atomic_word *__mem, int __val)
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{
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register _Atomic_word __result;
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__asm__ __volatile__ ("lock; xaddl %0,%2"
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: "=r" (__result)
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: "0" (__val), "m" (*__mem)
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: "memory");
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return __result;
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}
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static inline void
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__attribute__ ((unused))
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__atomic_add (volatile _Atomic_word* __mem, int __val)
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{
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__asm__ __volatile__ ("lock; addl %0,%1"
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: : "ir" (__val), "m" (*__mem) : "memory");
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}
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static inline char
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__attribute__ ((unused))
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__compare_and_swap (volatile long* __p, long __oldval, long __newval)
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{
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char __ret;
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long __readval;
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__asm__ __volatile__ ("lock; cmpxchgl %3, %1; sete %0"
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: "=q" (__ret), "=m" (*__p), "=a" (__readval)
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: "r" (__newval), "m" (*__p), "a" (__oldval));
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return __ret;
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}
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#endif /* atomicity.h */
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