1 /* Copyright (C) 2003-2022 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 "pthreadP.h"
19 #include <shlib-compat.h>
20
21 int
__pthread_spin_lock(pthread_spinlock_t * lock)22 __pthread_spin_lock (pthread_spinlock_t *lock)
23 {
24 unsigned int __tmp;
25
26 asm volatile (
27 "1: lwarx %0,0,%1" MUTEX_HINT_ACQ "\n"
28 " cmpwi 0,%0,0\n"
29 " bne- 2f\n"
30 " stwcx. %2,0,%1\n"
31 " bne- 2f\n"
32 __ARCH_ACQ_INSTR "\n"
33 " .subsection 1\n"
34 "2: lwzx %0,0,%1\n"
35 " cmpwi 0,%0,0\n"
36 " bne 2b\n"
37 " b 1b\n"
38 " .previous"
39 : "=&r" (__tmp)
40 : "r" (lock), "r" (1)
41 : "cr0", "memory");
42 return 0;
43 }
44 versioned_symbol (libc, __pthread_spin_lock, pthread_spin_lock, GLIBC_2_34);
45
46 #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_2, GLIBC_2_34)
47 compat_symbol (libpthread, __pthread_spin_lock, pthread_spin_lock, GLIBC_2_2);
48 #endif
49