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