1/*
2 * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. Please obtain a copy of the License at
10 * http://www.opensource.apple.com/apsl/ and read it before using this
11 * file.
12 *
13 * The Original Code and all software distributed under the License are
14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
18 * Please see the License for the specific language governing rights and
19 * limitations under the License.
20 *
21 * @APPLE_LICENSE_HEADER_END@
22 */
23/*
24 * Copyright (c) 1998 John Birrell <jb@cimlogic.com.au>.
25 * All rights reserved.
26 *
27 * Redistribution and use in source and binary forms, with or without
28 * modification, are permitted provided that the following conditions
29 * are met:
30 * 1. Redistributions of source code must retain the above copyright
31 *    notice, this list of conditions and the following disclaimer.
32 * 2. Redistributions in binary form must reproduce the above copyright
33 *    notice, this list of conditions and the following disclaimer in the
34 *    documentation and/or other materials provided with the distribution.
35 * 3. All advertising materials mentioning features or use of this software
36 *    must display the following acknowledgement:
37 *	This product includes software developed by John Birrell.
38 * 4. Neither the name of the author nor the names of any co-contributors
39 *    may be used to endorse or promote products derived from this software
40 *    without specific prior written permission.
41 *
42 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
43 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
44 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
45 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
46 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
47 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
48 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
49 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
50 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
51 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52 * SUCH DAMAGE.
53 *
54 * $FreeBSD: src/lib/libc/include/spinlock.h,v 1.5 2002/03/21 22:47:52 obrien Exp $
55 *
56 * Lock definitions used in both libc and libpthread.
57 *
58 */
59
60#ifndef _SPINLOCK_H_
61#define _SPINLOCK_H_
62#ifdef __APPLE__
63#include <pthread_spinlock.h>
64
65typedef pthread_lock_t spinlock_t;
66
67#define	_SPINLOCK_INITIALIZER	LOCK_INITIALIZER
68
69#define	_SPINLOCK(_lck)							\
70    do {								\
71	_DO_SPINLOCK_LOCK(_lck);					\
72    } while (0)
73
74#define _SPINUNLOCK(_lck)						\
75    do {								\
76	_DO_SPINLOCK_UNLOCK(_lck);					\
77    } while (0)
78
79#else /* ! __APPLE__ */
80#include <sys/cdefs.h>
81#include <sys/types.h>
82
83/*
84 * Lock structure with room for debugging information.
85 */
86typedef struct {
87	volatile long	access_lock;
88	volatile long	lock_owner;
89	volatile char	*fname;
90	volatile int	lineno;
91} spinlock_t;
92
93#define	_SPINLOCK_INITIALIZER	{ 0, 0, 0, 0 }
94
95#define _SPINUNLOCK(_lck)	(_lck)->access_lock = 0
96#ifdef	_LOCK_DEBUG
97#define	_SPINLOCK(_lck)		_spinlock_debug(_lck, __FILE__, __LINE__)
98#else
99#define	_SPINLOCK(_lck)		_spinlock(_lck)
100#endif
101
102/*
103 * Thread function prototype definitions:
104 */
105__BEGIN_DECLS
106long	_atomic_lock(volatile long *);
107void	_spinlock(spinlock_t *);
108void	_spinlock_debug(spinlock_t *, char *, int);
109__END_DECLS
110
111#endif /* __APPLE__ */
112
113#endif /* _SPINLOCK_H_ */
114