1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
/*
* Copyright (c) 1998 John Birrell <jb@cimlogic.com.au>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by John Birrell.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: spinlock.h,v 1.8 2003/01/31 04:46:17 marc Exp $
* $OpenBSD: spinlock.h,v 1.8 2003/01/31 04:46:17 marc Exp $
*
* Lock definitions used in both libc and libpthread.
*
*/
#ifndef _SPINLOCK_H_
#define _SPINLOCK_H_
#include <sys/cdefs.h>
#include <sys/types.h>
#include <machine/spinlock.h>
/*
* Lock structure with room for debugging information.
*/
typedef volatile struct {
_spinlock_lock_t access_lock;
void * lock_owner;
const char * fname;
int lineno;
} spinlock_t;
#define _SPINLOCK_INITIALIZER { _SPINLOCK_UNLOCKED, 0, 0, 0 }
#define _SPINUNLOCK(_lck) (_lck)->access_lock = _SPINLOCK_UNLOCKED
#ifdef _LOCK_DEBUG
#define _SPINLOCK(_lck) _spinlock_debug(_lck, __FILE__, __LINE__)
#else
#define _SPINLOCK(_lck) _spinlock(_lck)
#endif
#define _SPINLOCK_INIT(_lck) _SPINUNLOCK(_lck)
/*
* Thread function prototype definitions:
*/
__BEGIN_DECLS
void _spinlock(spinlock_t *);
void _spinlock_debug(spinlock_t *, const char *, int);
/* lock() functions return 0 if lock was acquired. */
/* is_locked functions() return 1 if lock is locked. */
int _atomic_lock(volatile _spinlock_lock_t *);
int _atomic_is_locked(volatile _spinlock_lock_t *);
__END_DECLS
#endif /* _SPINLOCK_H_ */
|
