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.Dd May 08, 2015
.Dt AVL 9F
.Os
.Sh NAME
.Nm avl ,
.Nm avl_add ,
.Nm avl_create ,
.Nm avl_destroy ,
.Nm avl_destroy_nodes ,
.Nm avl_find  ,
.Nm avl_first ,
.Nm avl_insert ,
.Nm avl_insert_here ,
.Nm avl_is_empty ,
.Nm avl_last ,
.Nm avl_nearest ,
.Nm avl_numnodes ,
.Nm avl_swap ,
.Nm AVL_NEXT ,
.Nm AVL_PREV ,
.Nd AVL tree routines
.Sh DESCRIPTION
AVL trees are a general purpose, self-balancing binary tree that can be
used instead of the standard linked list interfaces --
.Xr list_create 9F .
AVL trees are particularly useful either when order is important or
better lookup performance is required.
.Pp
The AVL tree interfaces are identical in both userland and the kernel.
For more general information on AVL trees, see
.Xr libavl 3LIB .
For more information on any of the funtions defined here, please see the
corresponding manual page in section 3AVL. Please note, that while
the descriptions in those manual pages are accurate for writers of
Device Drivers, the examples provided use scaffolding not available in
the kernel, such as the use of
.Fn malloc ,
and need to be adapated.
.Sh CONTEXT
All of the AVL routines may be used in user, kernel, and interrupt
context.
.Sh EXAMPLES
See
.Sy EXAMPLES
in
.Xr libavl 3LIB .
.Sh INTERFACE STABILITY
.Sy Committed
.Sh MT-Safety
AVL trees do not inherently have any internal locking, it is up to the
consumer to use locks as appropriate. See
.Xr mutex 9F
and
.Xr rwlock 9F
for more information on synchronization primitives.
.Sh SEE ALSO
.Xr libavl 3LIB ,
.Xr avl_add 3AVL ,
.Xr avl_create 3AVL ,
.Xr avl_destroy 3AVL ,
.Xr avl_destroy_nodes 3AVL ,
.Xr avl_find  3AVL ,
.Xr avl_first 3AVL ,
.Xr avl_insert 3AVL ,
.Xr avl_insert_here 3AVL ,
.Xr avl_is_empty 3AVL ,
.Xr avl_last 3AVL ,
.Xr avl_nearest 3AVL ,
.Xr avl_numnodes 3AVL ,
.Xr avl_swap 3AVL ,
.Xr AVL_NEXT 3AVL ,
.Xr AVL_PREV 3AVL ,
.Rs
.%T Writing Device Drivers
.Re