xref: /freebsd/sys/compat/linuxkpi/common/include/linux/rcupdate.h (revision 4f0a4502a1f33fef287ac558c98e5ef99a32216f)
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
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
51 rcu_read_lock(void)
52 {
53 	sx_slock(&linux_global_rcu_lock);
54 }
55 
56 static inline void
57 rcu_read_unlock(void)
58 {
59 	sx_sunlock(&linux_global_rcu_lock);
60 }
61 
62 static inline 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
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