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2b778ceb | 1 | /* Copyright (C) 2003-2021 Free Software Foundation, Inc. |
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2 | This file is part of the GNU C Library. |
3 | Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
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18 | |
19 | #include "pthreadP.h" | |
20 | ||
21 | int | |
bd2260a2 | 22 | pthread_spin_lock (pthread_spinlock_t *lock) |
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23 | { |
24 | unsigned int __tmp; | |
25 | ||
26 | asm volatile ( | |
9695cb3e | 27 | "1: lwarx %0,0,%1" MUTEX_HINT_ACQ "\n" |
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28 | " cmpwi 0,%0,0\n" |
29 | " bne- 2f\n" | |
30 | " stwcx. %2,0,%1\n" | |
31 | " bne- 2f\n" | |
9695cb3e | 32 | __ARCH_ACQ_INSTR "\n" |
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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 | } |