srcu.h revision 292538 
1/*-
2 * Copyright (c) 2015 Mellanox Technologies, Ltd.
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 unmodified, this list of conditions, and the following
10 *    disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 * $FreeBSD: head/sys/compat/linuxkpi/common/include/linux/srcu.h 292538 2015-12-21 11:03:12Z hselasky $
27 */
28#ifndef	_LINUX_SRCU_H_
29#define	_LINUX_SRCU_H_
30
31#include <sys/param.h>
32#include <sys/lock.h>
33#include <sys/sx.h>
34
35struct srcu_struct {
36	struct sx sx;
37};
38
39static inline int
40init_srcu_struct(struct srcu_struct *srcu)
41{
42	sx_init(&srcu->sx, "SleepableRCU");
43	return (0);
44}
45
46static inline void
47cleanup_srcu_struct(struct srcu_struct *srcu)
48{
49	sx_destroy(&srcu->sx);
50}
51
52static inline int
53srcu_read_lock(struct srcu_struct *srcu)
54{
55	sx_slock(&srcu->sx);
56	return (0);
57}
58
59static inline void
60srcu_read_unlock(struct srcu_struct *srcu, int key)
61{
62	sx_sunlock(&srcu->sx);
63}
64
65static inline void
66synchronize_srcu(struct srcu_struct *srcu)
67{
68	sx_xlock(&srcu->sx);
69	sx_xunlock(&srcu->sx);
70}
71
72#endif					/* _LINUX_SRCU_H_ */
73