1 /* POSIX spinlock implementation. SH version.
2 Copyright (C) 2000, 2001 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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 License as
7 published by the Free Software Foundation; either version 2.1 of the
8 License, or (at your option) any later version.
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.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If
17 not, see <http://www.gnu.org/licenses/>. */
21 #include "internals.h"
24 __pthread_spin_lock (pthread_spinlock_t *lock)
29 __asm__ __volatile__ ("tas.b @%1; movt %0"
37 weak_alias (__pthread_spin_lock, pthread_spin_lock)
41 __pthread_spin_trylock (pthread_spinlock_t *lock)
45 __asm__ __volatile__ ("tas.b @%1; movt %0"
49 return val ? 0 : EBUSY;
51 weak_alias (__pthread_spin_trylock, pthread_spin_trylock)
55 __pthread_spin_unlock (pthread_spinlock_t *lock)
59 weak_alias (__pthread_spin_unlock, pthread_spin_unlock)
63 __pthread_spin_init (pthread_spinlock_t *lock, int pshared)
65 /* We can ignore the `pshared' parameter. Since we are busy-waiting
66 all processes which can access the memory location `lock' points
67 to can use the spinlock. */
70 weak_alias (__pthread_spin_init, pthread_spin_init)
74 __pthread_spin_destroy (pthread_spinlock_t *lock)
79 weak_alias (__pthread_spin_destroy, pthread_spin_destroy)