1/* Copyright (C) 2012-2020 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#include <lowlevellock.h>
19#include <sysdep.h>
20
21ENTRY(pthread_spin_lock)
221: LOCK
23 decl 0(%rdi)
24 jne 2f
25 xor %eax, %eax
26 ret
27
28 .align 16
292: rep
30 nop
31 cmpl $0, 0(%rdi)
32 jg 1b
33 jmp 2b
34END(pthread_spin_lock)
35