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1 | /* Copyright (C) 2003, 2004 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. | |
3 | Contributed by Jakub Jelinek <jakub@redhat.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 | |
75efb018 MF |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
d5efd131 MF |
18 | |
19 | #include "pthreadP.h" | |
20 | ||
21 | int | |
22 | pthread_spin_lock (lock) | |
23 | pthread_spinlock_t *lock; | |
24 | { | |
25 | int *p = (int *) lock; | |
26 | ||
27 | while (__builtin_expect (__sync_val_compare_and_swap (p, 0, 1), 0)) | |
28 | { | |
29 | /* Spin without using the atomic instruction. */ | |
30 | do | |
31 | __asm __volatile ("hint @pause" : : : "memory"); | |
32 | while (*p); | |
33 | } | |
34 | return 0; | |
35 | } |