spinlock.h revision 112665 
1/*
2 * Copyright (c) 1998 John Birrell <jb@cimlogic.com.au>.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by John Birrell.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * $FreeBSD: head/lib/libc/include/spinlock.h 112665 2003-03-26 04:02:24Z jeff $
33 *
34 * Lock definitions used in both libc and libpthread.
35 *
36 */
37
38#ifndef _SPINLOCK_H_
39#define _SPINLOCK_H_
40#include <sys/cdefs.h>
41#include <sys/types.h>
42
43/*
44 * Lock structure with room for debugging information.
45 */
46typedef struct {
47	volatile long	access_lock;
48	volatile long	lock_owner;
49	volatile char	*fname;
50	volatile int	lineno;
51} spinlock_t;
52
53#define	_SPINLOCK_INITIALIZER	{ 0, 0, 0, 0 }
54
55#define _SPINUNLOCK(_lck)	_spinunlock(_lck);
56#ifdef	_LOCK_DEBUG
57#define	_SPINLOCK(_lck)		_spinlock_debug(_lck, __FILE__, __LINE__)
58#else
59#define	_SPINLOCK(_lck)		_spinlock(_lck)
60#endif
61
62/*
63 * Thread function prototype definitions:
64 */
65__BEGIN_DECLS
66long	_atomic_lock(volatile long *);
67void	_spinlock(spinlock_t *);
68void	_spinunlock(spinlock_t *);
69void	_spinlock_debug(spinlock_t *, char *, int);
70__END_DECLS
71
72#endif /* _SPINLOCK_H_ */
73