1 #ifndef __XFS_SUPPORT_RWLOCK_H__
2 #define __XFS_SUPPORT_RWLOCK_H__
3 
4 #include <sys/param.h>
5 #include <sys/lock.h>
6 #include <sys/mutex.h>
7 #include <sys/sx.h>
8 
9 typedef	struct sx rwlock_t;
10 typedef int    wait_queue_head_t;
11 
12 #define	rwlock_init(lock)	sx_init(lock, "rwlock")
13 #define	rwlock_destroy(lock)	sx_destroy(lock)
14 #define	read_lock(lock)		sx_slock(lock)
15 #define	read_unlock(lock)	sx_sunlock(lock)
16 #define	write_lock(lock)	sx_xlock(lock)
17 #define write_trylock(lock)	sx_try_xlock(lock)
18 #define	write_unlock(lock)	sx_xunlock(lock)
19 #define	rwlock_trypromote(lock)	sx_try_upgrade(lock)
20 #define	rwlock_demote(lock)	sx_downgrade(lock)
21 
22 
23 #endif /* __XFS_SUPPORT_RWLOCK_H__ */
24