1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
|
/* Copyright (C) 2002-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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 <pthread-errnos.h>
#ifdef UP
# define LOCK
#else
# define LOCK lock
#endif
.globl pthread_spin_trylock
.type pthread_spin_trylock,@function
.align 16
pthread_spin_trylock:
movl 4(%esp), %edx
movl $1, %eax
xorl %ecx, %ecx
LOCK
cmpxchgl %ecx, (%edx)
movl $EBUSY, %eax
#ifdef HAVE_CMOV
cmovel %ecx, %eax
#else
jne 0f
movl %ecx, %eax
0:
#endif
ret
.size pthread_spin_trylock,.-pthread_spin_trylock
|
