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

   1 #ifndef __XFS_SUPPORT_RWSEM_H__
   2 #define __XFS_SUPPORT_RWSEM_H__
   3
   4 #include <sys/param.h>
   5 #include <sys/lock.h>
   6 #include <sys/mutex.h>
   7 #include <sys/sx.h>
   8
   9 #define rw_semaphore    sx
  10
  11 #define init_rwsem(sem)         sx_init(sem, "rwsem")
  12 #define free_rwsem(sem)         sx_destroy(sem)
  13 #define down_read(sem)          sx_slock(sem)
  14 #define down_read_trylock(sem)  sx_try_slock(sem)
  15 #define down_write(sem)         sx_xlock(sem)
  16 #define down_write_trylock(sem) sx_try_xlock(sem)
  17 #define up_read(sem)            sx_sunlock(sem)
  18 #define up_write(sem)           sx_xunlock(sem)
  19 #define downgrade_write(sem)    sx_downgrade(sem)
  20
  21 #endif /* __XFS_SUPPORT_RWSEM_H__ */