1/*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice unmodified, this list of conditions, and the following
12 *    disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28#ifndef	_ATOMIC_LONG_H_
29#define	_ATOMIC_LONG_H_
30
31#include <sys/cdefs.h>
32#include <sys/types.h>
33#include <machine/atomic.h>
34
35typedef struct {
36	volatile u_long counter;
37} atomic_long_t;
38
39#define	atomic_long_add(i, v)		atomic_long_add_return((i), (v))
40#define	atomic_long_inc_return(v)	atomic_long_add_return(1, (v))
41
42static inline long
43atomic_long_add_return(long i, atomic_long_t *v)
44{
45	return i + atomic_fetchadd_long(&v->counter, i);
46}
47
48static inline void
49atomic_long_set(atomic_long_t *v, long i)
50{
51	atomic_store_rel_long(&v->counter, i);
52}
53
54static inline long
55atomic_long_read(atomic_long_t *v)
56{
57	return atomic_load_acq_long(&v->counter);
58}
59
60static inline long
61atomic_long_inc(atomic_long_t *v)
62{
63	return atomic_fetchadd_long(&v->counter, 1) + 1;
64}
65
66static inline long
67atomic_long_dec(atomic_long_t *v)
68{
69	return atomic_fetchadd_long(&v->counter, -1) - 1;
70}
71
72static inline long
73atomic_long_dec_and_test(atomic_long_t *v)
74{
75	long i = atomic_long_add(-1, v);
76	return i == 0 ;
77}
78
79#endif	/* _ATOMIC_LONG_H_ */
80