sys/gnu/fs/xfs/FreeBSD/support/rwlock.h

   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__ */