mirror of
https://sourceware.org/git/glibc.git
synced 2025-11-17 02:43:26 +03:00
fd27081d8e
These are already provided by the generic include/atomic.h. Reviewed-by: Uros Bizjak <ubizjak@gmail.com> Reviewed-by: Wilco Dijkstra <Wilco.Dijkstra@arm.com>
41 lines
1.5 KiB
C
41 lines
1.5 KiB
C
/* Atomic operations. X86 version.
|
|
Copyright (C) 2018-2025 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 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, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef _X86_ATOMIC_MACHINE_H
|
|
#define _X86_ATOMIC_MACHINE_H 1
|
|
|
|
#ifdef __x86_64__
|
|
# define __HAVE_64B_ATOMICS 1
|
|
#else
|
|
/* Since the Pentium, i386 CPUs have supported 64-bit atomics, but the
|
|
i386 psABI supplement provides only 4-byte alignment for uint64_t
|
|
inside structs, so it is currently not possible to use 64-bit
|
|
atomics on this platform. */
|
|
# define __HAVE_64B_ATOMICS 0
|
|
#endif
|
|
|
|
#define ATOMIC_EXCHANGE_USES_CAS 0
|
|
|
|
#define atomic_full_barrier() __sync_synchronize ()
|
|
#define atomic_read_barrier() __asm ("" ::: "memory")
|
|
#define atomic_write_barrier() __asm ("" ::: "memory")
|
|
|
|
#define atomic_spin_nop() __asm ("pause")
|
|
|
|
#endif /* atomic-machine.h */
|