1/* Copyright (C) 2002-2022 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 <sysdep.h>
19#include <errno.h>
20#include <shlib-compat.h>
21
22ENTRY (__pthread_spin_trylock)
23 movl 4(%esp), %edx
24 movl $1, %eax
25 xorl %ecx, %ecx
26 lock
27 cmpxchgl %ecx, (%edx)
28 movl $EBUSY, %eax
29#ifdef HAVE_CMOV
30 cmovel %ecx, %eax
31#else
32 jne 0f
33 movl %ecx, %eax
340:
35#endif
36 ret
37END (__pthread_spin_trylock)
38versioned_symbol (libc, __pthread_spin_trylock, pthread_spin_trylock,
39 GLIBC_2_34)
40
41#if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_2, GLIBC_2_34)
42compat_symbol (libpthread, __pthread_spin_trylock, pthread_spin_trylock,
43 GLIBC_2_2)
44#endif
45

source code of glibc/sysdeps/i386/pthread_spin_trylock.S