mirror of
https://gcc.gnu.org/git/gcc.git
synced 2024-12-14 06:23:58 +08:00
f17d6c73de
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.
|
|
Copyright (C) 1997 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public License as
|
|
published by the Free Software Foundation; either version 2 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
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If not,
|
|
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
#ifndef _BITS_ATOMICITY_H
|
|
#define _BITS_ATOMICITY_H 1
|
|
|
|
typedef int _Atomic_word;
|
|
|
|
static inline _Atomic_word
|
|
__attribute__ ((unused))
|
|
__exchange_and_add (volatile _Atomic_word *__mem, int __val)
|
|
{
|
|
register _Atomic_word __result;
|
|
__asm__ __volatile__ ("lock; xaddl %0,%2"
|
|
: "=r" (__result)
|
|
: "0" (__val), "m" (*__mem)
|
|
: "memory");
|
|
return __result;
|
|
}
|
|
|
|
static inline void
|
|
__attribute__ ((unused))
|
|
__atomic_add (volatile _Atomic_word* __mem, int __val)
|
|
{
|
|
__asm__ __volatile__ ("lock; addl %0,%1"
|
|
: : "ir" (__val), "m" (*__mem) : "memory");
|
|
}
|
|
|
|
static inline char
|
|
__attribute__ ((unused))
|
|
__compare_and_swap (volatile long* __p, long __oldval, long __newval)
|
|
{
|
|
char __ret;
|
|
long __readval;
|
|
|
|
__asm__ __volatile__ ("lock; cmpxchgl %3, %1; sete %0"
|
|
: "=q" (__ret), "=m" (*__p), "=a" (__readval)
|
|
: "r" (__newval), "m" (*__p), "a" (__oldval));
|
|
return __ret;
|
|
}
|
|
|
|
#endif /* atomicity.h */
|