X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Fhmap.h;h=9d07e842043f4666d79e2fe633bb45348ab5beac;hb=96628ae85fe26ac86d35bca5f4c288e56048c3d6;hp=04e51bc6d039b83448b576881ff0592b5ea3e83a;hpb=4e8e4213a815a30216e855a805a8bcd5b8c5a886;p=openvswitch

diff --git a/lib/hmap.h b/lib/hmap.h
index 04e51bc6..9d07e842 100644
--- a/lib/hmap.h
+++ b/lib/hmap.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2009, 2010 Nicira Networks.
+ * Copyright (c) 2008, 2009, 2010, 2012 Nicira, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -38,6 +38,7 @@ static inline size_t hmap_node_hash(const struct hmap_node *node)
 }
 
 #define HMAP_NODE_NULL ((struct hmap_node *) 1)
+#define HMAP_NODE_NULL_INITIALIZER { 0, HMAP_NODE_NULL }
 
 /* Returns true if 'node' has been set to null by hmap_node_nullify() and has
  * not been un-nullified by being inserted into an hmap. */
@@ -88,7 +89,7 @@ static inline void hmap_remove(struct hmap *, struct hmap_node *);
 
 void hmap_node_moved(struct hmap *, struct hmap_node *, struct hmap_node *);
 static inline void hmap_replace(struct hmap *, const struct hmap_node *old,
-                                struct hmap_node *new);
+                                struct hmap_node *new_node);
 
 struct hmap_node *hmap_random_node(const struct hmap *);
 
@@ -113,17 +114,14 @@ struct hmap_node *hmap_random_node(const struct hmap *);
  * HASH is only evaluated once.
  */
 #define HMAP_FOR_EACH_WITH_HASH(NODE, MEMBER, HASH, HMAP)               \
-    for ((NODE) = OBJECT_CONTAINING(hmap_first_with_hash(HMAP, HASH),   \
-                                  NODE, MEMBER);                        \
+    for (ASSIGN_CONTAINER(NODE, hmap_first_with_hash(HMAP, HASH), MEMBER); \
          &(NODE)->MEMBER != NULL;                                       \
-         (NODE) = OBJECT_CONTAINING(hmap_next_with_hash(&(NODE)->MEMBER), \
-                                  NODE, MEMBER))
+         ASSIGN_CONTAINER(NODE, hmap_next_with_hash(&(NODE)->MEMBER),   \
+                          MEMBER))
 #define HMAP_FOR_EACH_IN_BUCKET(NODE, MEMBER, HASH, HMAP)               \
-    for ((NODE) = OBJECT_CONTAINING(hmap_first_in_bucket(HMAP, HASH),   \
-                                  NODE, MEMBER);                        \
+    for (ASSIGN_CONTAINER(NODE, hmap_first_in_bucket(HMAP, HASH), MEMBER); \
          &(NODE)->MEMBER != NULL;                                       \
-         (NODE) = OBJECT_CONTAINING(hmap_next_in_bucket(&(NODE)->MEMBER), \
-                               NODE, MEMBER))
+         ASSIGN_CONTAINER(NODE, hmap_next_in_bucket(&(NODE)->MEMBER), MEMBER))
 
 static inline struct hmap_node *hmap_first_with_hash(const struct hmap *,
                                                      size_t hash);
@@ -132,29 +130,38 @@ static inline struct hmap_node *hmap_first_in_bucket(const struct hmap *,
                                                      size_t hash);
 static inline struct hmap_node *hmap_next_in_bucket(const struct hmap_node *);
 
-/* Iteration.
- *
- * The _SAFE version is needed when NODE may be freed.  It is not needed when
- * NODE may be removed from the hash map but its members remain accessible and
- * intact. */
+bool hmap_contains(const struct hmap *, const struct hmap_node *);
+
+/* Iteration. */
+
+/* Iterates through every node in HMAP. */
 #define HMAP_FOR_EACH(NODE, MEMBER, HMAP)                               \
-    for ((NODE) = OBJECT_CONTAINING(hmap_first(HMAP), NODE, MEMBER);    \
+    for (ASSIGN_CONTAINER(NODE, hmap_first(HMAP), MEMBER);              \
          &(NODE)->MEMBER != NULL;                                       \
-         (NODE) = OBJECT_CONTAINING(hmap_next(HMAP, &(NODE)->MEMBER),   \
-                                    NODE, MEMBER))
+         ASSIGN_CONTAINER(NODE, hmap_next(HMAP, &(NODE)->MEMBER), MEMBER))
 
+/* Safe when NODE may be freed (not needed when NODE may be removed from the
+ * hash map but its members remain accessible and intact). */
 #define HMAP_FOR_EACH_SAFE(NODE, NEXT, MEMBER, HMAP)                    \
-    for ((NODE) = OBJECT_CONTAINING(hmap_first(HMAP), NODE, MEMBER);    \
+    for (ASSIGN_CONTAINER(NODE, hmap_first(HMAP), MEMBER);              \
          (&(NODE)->MEMBER != NULL                                       \
-          ? (NEXT) = OBJECT_CONTAINING(hmap_next(HMAP, &(NODE)->MEMBER), \
-                                       NODE, MEMBER), 1                 \
+          ? ASSIGN_CONTAINER(NEXT, hmap_next(HMAP, &(NODE)->MEMBER), MEMBER) \
           : 0);                                                         \
          (NODE) = (NEXT))
 
+/* Continues an iteration from just after NODE. */
+#define HMAP_FOR_EACH_CONTINUE(NODE, MEMBER, HMAP)                      \
+    for (ASSIGN_CONTAINER(NODE, hmap_next(HMAP, &(NODE)->MEMBER), MEMBER); \
+         &(NODE)->MEMBER != NULL;                                       \
+         ASSIGN_CONTAINER(NODE, hmap_next(HMAP, &(NODE)->MEMBER), MEMBER))
+
 static inline struct hmap_node *hmap_first(const struct hmap *);
 static inline struct hmap_node *hmap_next(const struct hmap *,
                                           const struct hmap_node *);
 
+struct hmap_node *hmap_at_position(const struct hmap *,
+                                   uint32_t *bucket, uint32_t *offset);
+
 /* Returns the number of nodes currently in 'hmap'. */
 static inline size_t
 hmap_count(const struct hmap *hmap)