mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 21:10:07 +00:00
49 lines
1.5 KiB
ArmAsm
49 lines
1.5 KiB
ArmAsm
/* Copyright (C) 2012-2024 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/>. */
|
|
|
|
#include <sysdep.h>
|
|
#include <shlib-compat.h>
|
|
|
|
ENTRY(__pthread_spin_lock)
|
|
/* Always return zero. */
|
|
xor %eax, %eax
|
|
LOCK
|
|
decl 0(%rdi)
|
|
jne 1f
|
|
ret
|
|
|
|
.align 16
|
|
1:
|
|
/* `rep nop` == `pause`. */
|
|
rep
|
|
nop
|
|
cmpl %eax, 0(%rdi)
|
|
jle 1b
|
|
/* Just repeat the `lock decl` logic here. The code size save
|
|
of jumping back to entry doesn't change how many 16-byte
|
|
chunks (default function alignment) that the code fits in. */
|
|
LOCK
|
|
decl 0(%rdi)
|
|
jne 1b
|
|
ret
|
|
END(__pthread_spin_lock)
|
|
versioned_symbol (libc, __pthread_spin_lock, pthread_spin_lock, GLIBC_2_34)
|
|
|
|
#if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_2, GLIBC_2_34)
|
|
compat_symbol (libpthread, __pthread_spin_lock, pthread_spin_lock, GLIBC_2_2)
|
|
#endif
|