]>
git.ipfire.org Git - thirdparty/glibc.git/blob - sysdeps/x86_64/atomicity.h
1 /* Low-level functions for atomic operations. x86-64 version.
2 Copyright (C) 1997, 2000, 2001 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
21 #define _ATOMICITY_H 1
26 static inline uint32_t
27 __attribute__ ((unused
))
28 exchange_and_add (volatile uint32_t *mem
, uint32_t val
)
30 register uint32_t result
;
31 __asm__
__volatile__ ("lock; xaddl %0,%1"
32 : "=r" (result
), "=m" (*mem
) : "0" (val
), "1" (*mem
));
37 __attribute__ ((unused
))
38 atomic_add (volatile uint32_t *mem
, int val
)
40 __asm__
__volatile__ ("lock; addl %1,%0"
41 : "=m" (*mem
) : "er" (val
), "0" (*mem
));
45 __attribute__ ((unused
))
46 compare_and_swap (volatile long int *p
, long int oldval
, long int newval
)
51 __asm__
__volatile__ ("lock; cmpxchgq %3, %1; sete %0"
52 : "=q" (ret
), "=m" (*p
), "=a" (readval
)
53 : "r" (newval
), "1" (*p
), "a" (oldval
));
57 #endif /* atomicity.h */