1/* $NetBSD: localcount.h,v 1.5 2017/11/17 09:26:36 ozaki-r Exp $ */
2
3/*-
4 * Copyright (c) 2016 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Taylor R. Campbell.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#ifndef _SYS_LOCALCOUNT_H
33#define _SYS_LOCALCOUNT_H
34
35#ifndef _KERNEL
36#error <sys/localcount.h> is for kernel consumers only.
37#endif
38
39#include <sys/types.h>
40
41struct kcondvar;
42struct kmutex;
43struct percpu;
44
45struct localcount {
46 int64_t *lc_totalp;
47 struct percpu *lc_percpu; /* int64_t */
48 volatile uint32_t lc_refcnt; /* only for debugging */
49};
50
51void localcount_init(struct localcount *);
52void localcount_drain(struct localcount *, struct kcondvar *,
53 struct kmutex *);
54void localcount_fini(struct localcount *);
55void localcount_acquire(struct localcount *);
56void localcount_release(struct localcount *, struct kcondvar *,
57 struct kmutex *);
58
59uint32_t
60 localcount_debug_refcnt(const struct localcount *);
61
62#endif /* _SYS_LOCALCOUNT_H */