1
/* Machine-specific definition for spin locks. PowerPC version.
2
Copyright (C) 1994-2012 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
7
License as published by the Free Software Foundation; either
8
version 2.1 of the 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; if not, see
17
<http://www.gnu.org/licenses/>. */
19
#ifndef _MACHINE_LOCK_H
20
#define _MACHINE_LOCK_H
22
/* The type of a spin lock variable. */
24
typedef volatile long int __spin_lock_t;
26
/* Value to initialize `__spin_lock_t' variables to. */
28
#define __SPIN_LOCK_INITIALIZER 0L
31
#ifndef _EXTERN_INLINE
32
#define _EXTERN_INLINE __extern_inline
38
__spin_unlock (__spin_lock_t *__lock)
41
__asm__ __volatile__ ("\
45
" : "=&r" (__locked) : "r" (__lock), "r" (0) : "cr0");
48
/* Try to lock LOCK; return nonzero if we locked it, zero if another has. */
51
__spin_try_lock (register __spin_lock_t *__lock)
54
__asm__ __volatile__ ("\
58
" : "=&r" (__rtn) : "r" (__lock), "r" (1) : "cr0");
62
/* Return nonzero if LOCK is locked. */
65
__spin_lock_locked (__spin_lock_t *__lock)
68
__asm__ __volatile__ ("\
72
" : "=&r" (__rtn) : "r" (__lock) : "cr0");
77
#endif /* machine-lock.h */