1 /* POSIX spinlock implementation. Arm version.
2 Copyright (C) 2000 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 Library General Public License as
7 published by the Free Software Foundation; either version 2 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 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
22 #include "internals.h"
26 __pthread_spin_lock (pthread_spinlock_t
*lock
)
31 asm volatile ("swp %0, %1, [%2]"
39 weak_alias (__pthread_spin_lock
, pthread_spin_lock
)
43 __pthread_spin_trylock (pthread_spinlock_t
*lock
)
47 asm volatile ("swp %0, %1, [%2]"
52 return val
? EBUSY
: 0;
54 weak_alias (__pthread_spin_trylock
, pthread_spin_trylock
)
58 __pthread_spin_unlock (pthread_spinlock_t
*lock
)
62 weak_alias (__pthread_spin_unlock
, pthread_spin_unlock
)
66 __pthread_spin_init (pthread_spinlock_t
*lock
, int pshared
)
68 /* We can ignore the `pshared' parameter. Since we are busy-waiting
69 all processes which can access the memory location `lock' points
70 to can use the spinlock. */
73 weak_alias (__pthread_spin_init
, pthread_spin_init
)
77 __pthread_spin_destroy (pthread_spinlock_t
*lock
)
82 weak_alias (__pthread_spin_destroy
, pthread_spin_destroy
)