1 /*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice unmodified, this list of conditions, and the following
13 * disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29 #ifndef _LINUXKPI_LINUX_RWLOCK_H_
30 #define _LINUXKPI_LINUX_RWLOCK_H_
31
32 #include <sys/types.h>
33 #include <sys/lock.h>
34 #include <sys/rwlock.h>
35 #include <sys/libkern.h>
36
37 typedef struct {
38 struct rwlock rw;
39 } rwlock_t;
40
41 #define read_lock(_l) rw_rlock(&(_l)->rw)
42 #define write_lock(_l) rw_wlock(&(_l)->rw)
43 #define read_unlock(_l) rw_runlock(&(_l)->rw)
44 #define write_unlock(_l) rw_wunlock(&(_l)->rw)
45 #define read_lock_irq(lock) read_lock((lock))
46 #define read_unlock_irq(lock) read_unlock((lock))
47 #define write_lock_irq(lock) write_lock((lock))
48 #define write_unlock_irq(lock) write_unlock((lock))
49 #define read_lock_irqsave(lock, flags) \
50 do {(flags) = 0; read_lock(lock); } while (0)
51 #define write_lock_irqsave(lock, flags) \
52 do {(flags) = 0; write_lock(lock); } while (0)
53 #define read_unlock_irqrestore(lock, flags) \
54 do { read_unlock(lock); } while (0)
55 #define write_unlock_irqrestore(lock, flags) \
56 do { write_unlock(lock); } while (0)
57
58 static inline void
rwlock_init(rwlock_t * lock)59 rwlock_init(rwlock_t *lock)
60 {
61
62 memset(&lock->rw, 0, sizeof(lock->rw));
63 rw_init_flags(&lock->rw, "lnxrw", RW_NOWITNESS);
64 }
65
66 #endif /* _LINUXKPI_LINUX_RWLOCK_H_ */
67