1 /* Copyright (C) 2003 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 <http://www.gnu.org/licenses/>. */
17
18 #include "pthreadP.h"
19
20 int
pthread_spin_lock(pthread_spinlock_t * lock)21 pthread_spin_lock (pthread_spinlock_t *lock)
22 {
23 unsigned int val;
24
25 do
26 __asm__ __volatile__ ("tas.b @%1; movt %0"
27 : "=&r" (val)
28 : "r" (lock)
29 : "memory");
30 while (val == 0);
31
32 return 0;
33 }
34