1 /*-
2 * Copyright (c) 2016 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 * $FreeBSD$
27 */
28 #ifndef _LINUX_RCUPDATE_H_
29 #define _LINUX_RCUPDATE_H_
30
31 #include <sys/param.h>
32 #include <sys/lock.h>
33 #include <sys/sx.h>
34
35 extern struct sx linux_global_rcu_lock;
36
37 struct rcu_head {
38 };
39
40 typedef void (*rcu_callback_t)(struct rcu_head *);
41
42 static inline void
call_rcu(struct rcu_head * ptr,rcu_callback_t func)43 call_rcu(struct rcu_head *ptr, rcu_callback_t func)
44 {
45 sx_xlock(&linux_global_rcu_lock);
46 func(ptr);
47 sx_xunlock(&linux_global_rcu_lock);
48 }
49
50 static inline void
rcu_read_lock(void)51 rcu_read_lock(void)
52 {
53 sx_slock(&linux_global_rcu_lock);
54 }
55
56 static inline void
rcu_read_unlock(void)57 rcu_read_unlock(void)
58 {
59 sx_sunlock(&linux_global_rcu_lock);
60 }
61
62 static inline void
rcu_barrier(void)63 rcu_barrier(void)
64 {
65 sx_xlock(&linux_global_rcu_lock);
66 sx_xunlock(&linux_global_rcu_lock);
67 }
68
69 static inline void
synchronize_rcu(void)70 synchronize_rcu(void)
71 {
72 sx_xlock(&linux_global_rcu_lock);
73 sx_xunlock(&linux_global_rcu_lock);
74 }
75
76 #endif /* _LINUX_RCUPDATE_H_ */
77