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name length removed from structure; value is stored in single byte immediately

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after the structure.

color stored in single bit

references bitfield width decrease by one

typedef for a node_chain structure, used by dns_rbt_findnode

dns_rbt_create takes a new second argument that is a pointer to a function
which frees node data when the node is deleted.

dns_rbt_addnode provided to return the node that was added.
This commit is contained in:
David Lawrence 1999-01-31 00:32:51 +00:00
parent 8aefdfc906
commit 8d320be20d
1 changed files with 28 additions and 11 deletions
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39
lib/dns/include/dns/rbt.h
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@ -36,24 +36,24 @@
typedef struct dns_rbt dns_rbt_t; typedef struct dns_rbt dns_rbt_t;
/* These should add up to 31 XXX change to 30 after color fix */ /* These should add up to 30 */
#define DNS_RBT_LOCKLENGTH 10 #define DNS_RBT_LOCKLENGTH 10
#define DNS_RBT_REFLENGTH 21 #define DNS_RBT_REFLENGTH 20
typedef struct dns_rbt_node { typedef struct dns_rbt_node {
struct dns_rbt_node *left; struct dns_rbt_node *left;
struct dns_rbt_node *right; struct dns_rbt_node *right;
struct dns_rbt_node *down; struct dns_rbt_node *down;
enum { red, black } color; void *data;
/* XXX should make color one of the following bits */ unsigned int color:1;
unsigned int dirty:1; unsigned int dirty:1;
unsigned int locknum:DNS_RBT_LOCKLENGTH; unsigned int locknum:DNS_RBT_LOCKLENGTH;
unsigned int references:DNS_RBT_REFLENGTH; unsigned int references:DNS_RBT_REFLENGTH;
void *data;
unsigned int name_length;
} dns_rbtnode_t; } dns_rbtnode_t;
typedef struct node_chain node_chain_t;
dns_result_t dns_rbt_addname(dns_rbt_t *rbt, dns_name_t *name, void *data); dns_result_t dns_rbt_addname(dns_rbt_t *rbt, dns_name_t *name, void *data);
/* /*
* Add 'name' to the tree of trees, associated with 'data'. * Add 'name' to the tree of trees, associated with 'data'.
@ -64,13 +64,14 @@ dns_result_t dns_rbt_addname(dns_rbt_t *rbt, dns_name_t *name, void *data);
* again and then setting the data pointer. * again and then setting the data pointer.
* *
* Requires: * Requires:
* rbt is a valid rbt structure.
* dns_name_isabsolute(name) == TRUE * dns_name_isabsolute(name) == TRUE
* *
* Ensures: * Ensures:
* *
* 'name' is not altered in any way. * 'name' is not altered in any way.
* *
* If result is success: * If result is DNS_R_SUCCESS:
* 'name' is findable in the red/black tree of trees in O(log N). * 'name' is findable in the red/black tree of trees in O(log N).
* *
* Returns: * Returns:
@ -78,12 +79,26 @@ dns_result_t dns_rbt_addname(dns_rbt_t *rbt, dns_name_t *name, void *data);
* Resource Limit: Out of Memory * Resource Limit: Out of Memory
*/ */
dns_result_t dns_rbt_deletename(dns_rbt_t *rbt, dns_name_t *name); dns_result_t dns_rbt_addnode(dns_rbt_t *rbt, dns_name_t *name,
dns_rbtnode_t **nodep);
/*
* Just like dns_rbt_addname, but return the address of the added node,
* even when the node already existed.
*
* Requires:
* rbt is a valid rbt structure.
* dns_name_isabsolute(name) == TRUE
* nodep != NULL && *nodep == NULL
*/
dns_result_t dns_rbt_deletename(dns_rbt_t *rbt, dns_name_t *name,
isc_boolean_t recurse);
/* /*
* Delete 'name' from the tree of trees. * Delete 'name' from the tree of trees.
* *
* Notes: * Notes:
* When 'name' is removed, all of its subnames are removed too. * When 'name' is removed, if recurse is TRUE then all of its
* subnames are removed too.
* *
* Requires: * Requires:
* dns_name_isabsolute(name) == TRUE * dns_name_isabsolute(name) == TRUE
@ -110,7 +125,8 @@ void dns_rbt_namefromnode(dns_rbtnode_t *node, dns_name_t *name);
* *
*/ */
dns_rbtnode_t *dns_rbt_findnode(dns_rbt_t *rbt, dns_name_t *name); dns_rbtnode_t *dns_rbt_findnode(dns_rbt_t *rbt, dns_name_t *name,
node_chain_t *chain);
/* /*
* Find the node for 'name'. * Find the node for 'name'.
* *
@ -133,5 +149,6 @@ void dns_rbt_printnodename(dns_rbtnode_t *node);
void dns_rbt_printtree(dns_rbtnode_t *root, dns_rbtnode_t *parent, int depth); void dns_rbt_printtree(dns_rbtnode_t *root, dns_rbtnode_t *parent, int depth);
void dns_rbt_printall(dns_rbt_t *rbt); void dns_rbt_printall(dns_rbt_t *rbt);
dns_result_t dns_rbt_create(isc_mem_t *mctx, dns_rbt_t **rbtp); dns_result_t dns_rbt_create(isc_mem_t *mctx, void (*deleter)(void *),
dns_rbt_t **rbtp);
void dns_rbt_destroy(dns_rbt_t **rbtp); void dns_rbt_destroy(dns_rbt_t **rbtp);