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b168057a | 1 | /* Copyright (C) 2003-2015 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 | |
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16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
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18 | |
19 | #include <errno.h> | |
20 | #include "pthreadP.h" | |
21 | ||
22 | int | |
bd2260a2 | 23 | pthread_spin_trylock (pthread_spinlock_t *lock) |
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24 | { |
25 | unsigned int old; | |
26 | int err = EBUSY; | |
27 | ||
28 | asm ("1: lwarx %0,0,%2\n" | |
29 | " cmpwi 0,%0,0\n" | |
30 | " bne 2f\n" | |
31 | " stwcx. %3,0,%2\n" | |
32 | " bne- 1b\n" | |
33 | " li %1,0\n" | |
34 | " isync\n" | |
35 | "2: " | |
36 | : "=&r" (old), "=&r" (err) | |
37 | : "r" (lock), "r" (1), "1" (err) | |
38 | : "cr0", "memory"); | |
39 | ||
40 | return err; | |
41 | } |