X-Git-Url: http://git.ozlabs.org/?a=blobdiff_plain;f=ccan%2Ftlist%2Ftlist.h;h=37882ee7bbdcc62f0eaa38097a3c9b66eacc05fa;hb=78b06543e80fc76b953b6a65684dce312da7e660;hp=937a834c0184fb4d54928ca57db9668a929b1f8c;hpb=919b97d6e573eb794d7819f1af8da29023d6b193;p=ccan

diff --git a/ccan/tlist/tlist.h b/ccan/tlist/tlist.h
index 937a834c..37882ee7 100644
--- a/ccan/tlist/tlist.h
+++ b/ccan/tlist/tlist.h
@@ -9,17 +9,18 @@
  * @suffix: the name to use (struct tlist_@suffix)
  * @type: the type the list will contain (void for any type)
  *
- * This declares a structure "struct tlist_@suffix" to use for
- * lists containing this type.  The actual list can be accessed using
- * ".raw" or tlist_raw().
+ * This declares a structure "struct tlist_@suffix" to use for lists
+ * containing this type.  The actual list can be accessed using
+ * tlist_raw().  For maximum portability, place tlists embedded in
+ * structures as the last member.
  *
  * Example:
  *	// Defines struct tlist_children
  *	TLIST_TYPE(children, struct child);
  *	struct parent {
  *		const char *name;
- *		struct tlist_children children;
  *		unsigned int num_children;
+ *		struct tlist_children children;
  *	};
  *
  *	struct child {
@@ -29,8 +30,7 @@
  */
 #define TLIST_TYPE(suffix, type)			\
 	struct tlist_##suffix {				\
-		struct list_head raw;			\
-		TCON(type *canary);			\
+		TCON_WRAP(struct list_head, type *canary);	\
 	}
 
 /**
@@ -45,7 +45,7 @@
  * Example:
  *	static struct tlist_children my_list = TLIST_INIT(my_list);
  */
-#define TLIST_INIT(name) { LIST_HEAD_INIT(name.raw) }
+#define TLIST_INIT(name) TCON_WRAP_INIT(LIST_HEAD_INIT(*tcon_unwrap(&name)))
 
 /**
  * tlist_check - check head of a list for consistency
@@ -74,7 +74,7 @@
  *	}
  */
 #define tlist_check(h, abortstr) \
-	list_check(&(h)->raw, (abortstr))
+	list_check(tcon_unwrap(h), (abortstr))
 
 /**
  * tlist_init - initialize a tlist
@@ -87,7 +87,7 @@
  *	tlist_init(&parent->children);
  *	parent->num_children = 0;
  */
-#define tlist_init(h) list_head_init(&(h)->raw)
+#define tlist_init(h) list_head_init(tcon_unwrap(h))
 
 /**
  * tlist_raw - unwrap the typed list and check the type
@@ -98,7 +98,7 @@
  * variable is of an unexpected type.  It is used internally where we
  * need to access the raw underlying list.
  */
-#define tlist_raw(h, expr) (&tcon_check((h), canary, (expr))->raw)
+#define tlist_raw(h, expr) tcon_unwrap(tcon_check((h), canary, (expr)))
 
 /**
  * tlist_add - add an entry at the start of a linked list.
@@ -173,7 +173,7 @@
  * Example:
  *	assert(tlist_empty(&parent->children) == (parent->num_children == 0));
  */
-#define tlist_empty(h) list_empty(&(h)->raw)
+#define tlist_empty(h) list_empty(tcon_unwrap(h))
 
 /**
  * tlist_top - get the first entry in a list
@@ -190,7 +190,7 @@
  */
 #define tlist_top(h, member)						\
 	((tcon_type((h), canary))					\
-	 list_top_(&(h)->raw,						\
+	 list_top_(tcon_unwrap((h)),					\
 		   (char *)(&(h)->_tcon[0].canary->member) -		\
 		   (char *)((h)->_tcon[0].canary)))
 
@@ -209,10 +209,34 @@
  */
 #define tlist_tail(h, member)						\
 	((tcon_type((h), canary))					\
-	 list_tail_(&(h)->raw,						\
+	 list_tail_(tcon_unwrap(h),					\
 		    (char *)(&(h)->_tcon[0].canary->member) -		\
 		    (char *)((h)->_tcon[0].canary)))
 
+/**
+ * tlist_next - get the next entry in a list
+ * @h: the tlist
+ * @n: the list element
+ * @member: the list_node member of the type
+ *
+ * Returns the element of list @h immediately after @n, or NULL, if @n
+ * is the last element in the list.
+ */
+#define tlist_next(h, n, member)					\
+	list_next(tlist_raw((h), (n)), (n), member)
+
+/**
+ * tlist_prev - get the previous entry in a list
+ * @h: the tlist
+ * @n: the list element
+ * @member: the list_node member of the type
+ *
+ * Returns the element of list @h immediately before @n, or NULL, if
+ * @n is the first element in the list.
+ */
+#define tlist_prev(h, n, member)					\
+	list_prev(tlist_raw((h), (n)), (n), member)
+
 /**
  * tlist_for_each - iterate through a list.
  * @h: the tlist