diff --git a/configure.ac b/configure.ac
index e655205..45dac5a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -53,6 +53,9 @@ AM_CFLAGS="${AM_CFLAGS} ${MEM_OPT_FLAGS}"
 AM_CFLAGS="${AM_CFLAGS} ${CFLAGS}"
 AC_SUBST(AM_CFLAGS)
 
+AM_LDFLAGS=""
+AC_SUBST(AM_LDFLAGS)
+
 AC_CONFIG_FILES([Makefile
 		 docs/Makefile
 		 tests/Makefile
diff --git a/include/tr/hash.h b/include/tr/hash.h
index 793894f..9792d3d 100644
--- a/include/tr/hash.h
+++ b/include/tr/hash.h
@@ -28,25 +28,25 @@
 #include "trbase.h"
 #include "tr/tree.h"
 
-#define TR_HASH_IS_EMPTY(h)	((h)->root)
+#define TR_HASH_IS_EMPTY(h)	((h)->tree->root)
 
 TR_CLASS(TR_Hash) {
-	TR_Tree root;
+	TR_Tree tree;
 	int     cleanup_no_free;
 };
 TR_INSTANCE_INIT(TR_Hash);
 TR_CLASSVARS_DECL(TR_Hash) {};
 
-#define TR_hashEmpty(hash) (NULL == (hash)->root)
+//#define TR_hashEmpty(hash) (NULL == (hash)->tree->root)
 
-void * TR_hashAdd(TR_Hash, void *);
-void * TR_hashDelete(TR_Hash, const char *, size_t);
-void * TR_hashGet(TR_Hash, const char *, size_t);
-void * TR_hashGetFirst(TR_Hash);
-void * TR_hashDeleteByVal(TR_Hash, unsigned long);
-void * TR_hashGetByVal(TR_Hash, unsigned long);
-void   TR_hashEach(TR_Hash, const void *, void (*)(const void *, const void *));
-void   TR_hashCleanup(TR_Hash);
+void          * TR_hashAdd(TR_Hash, void *);
+void          * TR_hashDelete(TR_Hash, const char *, size_t);
+void          * TR_hashGet(TR_Hash, const char *, size_t);
+void          * TR_hashGetFirst(TR_Hash);
+void          * TR_hashDeleteByVal(TR_Hash, unsigned long);
+void          * TR_hashGetByVal(TR_Hash, unsigned long);
+unsigned long   TR_hashEach(TR_Hash, const void *, void (*)(const void *, const void *));
+void            TR_hashCleanup(TR_Hash);
 
 #endif // __TR_HASH_H__
 
diff --git a/include/tr/tree.h b/include/tr/tree.h
index 6ff6040..353fc08 100644
--- a/include/tr/tree.h
+++ b/include/tr/tree.h
@@ -26,14 +26,20 @@
 #include "tr/tree_macros.h"
 #include "trbase.h"
 
-TR_CLASS(TR_Tree) {
+TR_CLASS(TR_TreeNode) {
 	void * data;
 
 	TR_rbColor color;
 
-	TR_Tree parent;
-	TR_Tree left;
-	TR_Tree right;
+	TR_TreeNode parent;
+	TR_TreeNode left;
+	TR_TreeNode right;
+};
+TR_INSTANCE_INIT(TR_TreeNode);
+TR_CLASSVARS_DECL(TR_TreeNode) {};
+
+TR_CLASS(TR_Tree) {
+	TR_TreeNode     root;
 };
 TR_INSTANCE_INIT(TR_Tree);
 TR_CLASSVARS_DECL(TR_Tree) {};
@@ -41,11 +47,11 @@ TR_CLASSVARS_DECL(TR_Tree) {};
 typedef int  (*TR_TreeComp)(const void *, const void *);
 typedef void (*TR_TreeAction)(const void *, const void *, const int);
 
-void * TR_treeFind(TR_Tree, const void *, TR_TreeComp);
-void * TR_treeInsert(TR_Tree *, const void *, TR_TreeComp);
-void * TR_treeDelete(TR_Tree *, const void *, TR_TreeComp);
-void   TR_treeWalk(TR_Tree, const void *, TR_TreeAction);
-void   TR_treeDestroy(TR_Tree *, TR_TreeAction);
+void          * TR_treeFind(TR_Tree, const void *, TR_TreeComp);
+void          * TR_treeInsert(TR_Tree, const void *, TR_TreeComp);
+void          * TR_treeDelete(TR_Tree, const void *, TR_TreeComp);
+unsigned long   TR_treeWalk(TR_Tree, const void *, TR_TreeAction);
+void            TR_treeDestroy(TR_Tree, TR_TreeAction);
 
 #endif // __TR_TREE_H__
 
diff --git a/src/Makefile.am b/src/Makefile.am
index 690c7c3..bee8a22 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,7 +1,8 @@
 ACLOCAL_AMFLAGS = -I m4
 AUTOMAKE_OPTIONS = subdir-objects
 
-AM_CFLAGS += -I../include/
+AM_CFLAGS += -I../include/ -std=c99 -DREENTRANT -lpthread
+AM_LDFLAGS += -lpthread
 
 TRDATALIBS = cbuf/libcbuf.la \
 	     hash/libhash.la \
@@ -13,5 +14,6 @@ lib_LTLIBRARIES = libtrdata.la
 libtrdata_la_SOURCES =
 libtrdata_la_CFLAGS  = $(AM_CFLAGS)
 libtrdata_la_LIBADD  = $(TRDATALIBS)
+libtrdata_la_LDFLAGS = -version-info 0:0:0 $(AM_LDFLAGS)
 
 SUBDIRS = cbuf hash queue tree
diff --git a/src/cbuf/Makefile.am b/src/cbuf/Makefile.am
index 834d30c..6249a4b 100644
--- a/src/cbuf/Makefile.am
+++ b/src/cbuf/Makefile.am
@@ -1,7 +1,8 @@
 ACLOCAL_AMFLAGS = -I m4
 AUTOMAKE_OPTIONS = subdir-objects
 
-AM_CFLAGS += -I../../include/
+AM_CFLAGS += -I../../include/ -std=c99 -DREENTRANT -lpthread
+AM_LDFLAGS += -lpthread
 
 CB = cbuf.c read.c \
      get_line.c set_data.c get_data.c \
@@ -14,3 +15,4 @@ noinst_LTLIBRARIES = libcbuf.la
 
 libcbuf_la_SOURCES = $(CB)
 libcbuf_la_CFLAGS  = $(AM_CFLAGS)
+libcbuf_la_LIBADD  = $(AM_LDFLAGS)
diff --git a/src/hash/Makefile.am b/src/hash/Makefile.am
index 615fba0..6bbc9c5 100644
--- a/src/hash/Makefile.am
+++ b/src/hash/Makefile.am
@@ -1,7 +1,8 @@
 ACLOCAL_AMFLAGS = -I m4
 AUTOMAKE_OPTIONS = subdir-objects
 
-AM_CFLAGS += -I../../include/
+AM_CFLAGS += -I../../include/ -std=c99 -DREENTRANT -lpthread
+AM_LDFLAGS += -lpthread
 
 HASH = hash.c add.c get.c get_first.c delete.c each.c value.c \
        cleanup.c interface/hashable.c
@@ -10,3 +11,4 @@ noinst_LTLIBRARIES = libhash.la
 
 libhash_la_SOURCES = $(HASH)
 libhash_la_CFLAGS  = $(AM_CFLAGS)
+libhash_la_LIBADD  = $(AM_LDFLAGS)
diff --git a/src/hash/add.c b/src/hash/add.c
index 6ea8692..83d185c 100644
--- a/src/hash/add.c
+++ b/src/hash/add.c
@@ -48,7 +48,7 @@ hashAddComp(const void * a, const void * b)
 void *
 TR_hashAdd(TR_Hash this, void * operand)
 {
-	void * found = TR_treeInsert(&this->root, operand, hashAddComp);
+	void * found = TR_treeInsert(this->tree, operand, hashAddComp);
 
 	if (NULL == found) {
 		return NULL;
diff --git a/src/hash/cleanup.c b/src/hash/cleanup.c
index 5245ea3..a0c6290 100644
--- a/src/hash/cleanup.c
+++ b/src/hash/cleanup.c
@@ -36,10 +36,12 @@ void
 TR_hashCleanup(TR_Hash this)
 {
 	if (this->cleanup_no_free) {
-		TR_treeDestroy(&(this->root), NULL);
+		TR_treeDestroy(this->tree, NULL);
 	} else {
-		TR_treeDestroy(&(this->root), tDelete);
+		TR_treeDestroy(this->tree, tDelete);
 	}
+
+	TR_delete(this->tree);
 }
 
 // vim: set ts=4 sw=4:
diff --git a/src/hash/delete.c b/src/hash/delete.c
index 2013853..e0887d4 100644
--- a/src/hash/delete.c
+++ b/src/hash/delete.c
@@ -51,7 +51,7 @@ TR_hashDelete(TR_Hash this, const char * search, size_t nsearch)
 	unsigned long   hash  = TR_sdbm((const unsigned char *)search, nsearch);
 	void          * found = NULL;
 
-	found = TR_treeDelete(&(this->root), &hash, hashDeleteComp);
+	found = TR_treeDelete(this->tree, &hash, hashDeleteComp);
 
 	return found;
 }
@@ -59,7 +59,7 @@ TR_hashDelete(TR_Hash this, const char * search, size_t nsearch)
 void *
 TR_hashDeleteByVal(TR_Hash this, unsigned long hash)
 {
-	void * found = TR_treeDelete(&(this->root), &hash, hashDeleteComp);
+	void * found = TR_treeDelete(this->tree, &hash, hashDeleteComp);
 
 	return found;
 }
diff --git a/src/hash/each.c b/src/hash/each.c
index 97c3995..33f68b7 100644
--- a/src/hash/each.c
+++ b/src/hash/each.c
@@ -34,7 +34,7 @@ walk(const void * node, const void * data, const int depth)
 	cb(node, data);
 }
 
-void
+unsigned long
 TR_hashEach(
 		TR_Hash this,
 		const void * data,
@@ -42,7 +42,7 @@ TR_hashEach(
 {
 	cb = callback;
 
-	TR_treeWalk(this->root, data, walk);
+	return TR_treeWalk(this->tree, data, walk);
 }
 
 // vim: set ts=4 sw=4:
diff --git a/src/hash/get.c b/src/hash/get.c
index fd439ca..e26cafa 100644
--- a/src/hash/get.c
+++ b/src/hash/get.c
@@ -52,7 +52,7 @@ void *
 TR_hashGet(TR_Hash this, const char * search, size_t nsearch)
 {
 	unsigned long   hash  = TR_sdbm((const unsigned char *)search, nsearch);
-	void          * found = TR_treeFind(this->root, &hash, hashGetComp);
+	void          * found = TR_treeFind(this->tree, &hash, hashGetComp);
 
 	return found;
 }
@@ -60,7 +60,7 @@ TR_hashGet(TR_Hash this, const char * search, size_t nsearch)
 void *
 TR_hashGetByVal(TR_Hash this, unsigned long hash)
 {
-	void * found = TR_treeFind(this->root, &hash, hashGetComp);
+	void * found = TR_treeFind(this->tree, &hash, hashGetComp);
 
 	return found;
 }
diff --git a/src/hash/get_first.c b/src/hash/get_first.c
index d378cc2..1d93689 100644
--- a/src/hash/get_first.c
+++ b/src/hash/get_first.c
@@ -27,7 +27,7 @@
 void *
 TR_hashGetFirst(TR_Hash this)
 {
-	return this->root;
+	return this->tree->root;
 }
 
 // vim: set ts=4 sw=4:
diff --git a/src/hash/hash.c b/src/hash/hash.c
index 99773d0..3e3dbb3 100644
--- a/src/hash/hash.c
+++ b/src/hash/hash.c
@@ -31,6 +31,10 @@ static
 int
 hashCtor(void * _this, va_list * params)
 {
+	TR_Hash this = _this;
+
+	this->tree = TR_new(TR_Tree);
+
 	return 0;
 }
 
@@ -41,6 +45,8 @@ hashDtor(void * _this)
 	TR_Hash this = _this;
 
 	TR_hashCleanup(this);
+
+	TR_delete(this->tree);
 }
 
 TR_INIT_IFACE(TR_Class, hashCtor, hashDtor, NULL);
diff --git a/src/queue/Makefile.am b/src/queue/Makefile.am
index d3e49c5..6d13c33 100644
--- a/src/queue/Makefile.am
+++ b/src/queue/Makefile.am
@@ -1,17 +1,13 @@
 ACLOCAL_AMFLAGS = -I m4
 AUTOMAKE_OPTIONS = subdir-objects
 
-AM_CFLAGS += -I../../include/
+AM_CFLAGS += -I../../include/ -std=c99 -DREENTRANT -lpthread
+AM_LDFLAGS += -lpthread
 
-noinst_LTLIBRARIES = libqueue.la
+QUEUE = queue.c get.c put.c put_first.c find.c find_parent.c delete.c destroy.c
 
-libqueue_la_SOURCES = queue.c \
-		      get.c \
-		      put.c \
-		      put_first.c \
-		      find.c \
-		      find_parent.c \
-		      delete.c \
-		      destroy.c
+noinst_LTLIBRARIES = libqueue.la
 
+libqueue_la_SOURCES = $(QUEUE)
 libqueue_la_CFLAGS  = $(AM_CFLAGS)
+libqueue_la_LIBADD  = $(AM_LDFLAGS)
diff --git a/src/queue/delete.c b/src/queue/delete.c
index d0676d6..c9ecc51 100644
--- a/src/queue/delete.c
+++ b/src/queue/delete.c
@@ -26,9 +26,13 @@
 void
 TR_queueDelete(TR_Queue this, void * msg)
 {
-	TR_Queue node, parent = TR_queueFindParent(this, msg);
+	TR_Queue node, parent;
+	
+	parent = TR_queueFindParent(this, msg);
 
-	if (! parent) return;
+	if (! parent) {
+		return;
+	}
 
 	node = parent->next;
 	parent->next = node->next;
diff --git a/src/queue/destroy.c b/src/queue/destroy.c
index d70ae1f..d758e87 100644
--- a/src/queue/destroy.c
+++ b/src/queue/destroy.c
@@ -28,8 +28,10 @@
 void
 TR_queueDestroy(TR_Queue this)
 {
-	TR_Queue node = this->first;
+	TR_Queue node;
 	
+	node = this->first;
+
 	while (NULL != node) {
 		TR_Queue next = node->next;
 		if (this->free_msgs) {
diff --git a/src/queue/put.c b/src/queue/put.c
index 803958c..f5969c3 100644
--- a/src/queue/put.c
+++ b/src/queue/put.c
@@ -26,7 +26,9 @@
 void
 TR_queuePut(TR_Queue this, void * msg)
 {
-	TR_Queue node = (this->last)? this->last : this;
+	TR_Queue node;
+
+	node = (this->last)? this->last : this;
 
 	node->next = TR_new(TR_Queue);
 	this->last = node->next;
diff --git a/src/queue/put_first.c b/src/queue/put_first.c
index 80e3bf0..c52ea9d 100644
--- a/src/queue/put_first.c
+++ b/src/queue/put_first.c
@@ -26,7 +26,9 @@
 void
 TR_queuePutFirst(TR_Queue this, void * msg)
 {
-	TR_Queue current_first = this->first;
+	TR_Queue current_first;
+
+	current_first = this->first;
 
 	this->first = this->next = TR_new(TR_Queue);
 	this->first->next = current_first;
diff --git a/src/queue/queue.c b/src/queue/queue.c
index 29d0c81..79ec171 100644
--- a/src/queue/queue.c
+++ b/src/queue/queue.c
@@ -40,7 +40,9 @@ static
 void
 queueDtor(void * _this)
 {
-	TR_queueDestroy((TR_Queue)_this);
+	TR_Queue this = _this;
+
+	TR_queueDestroy(this);
 }
 
 TR_INIT_IFACE(TR_Class, queueCtor, queueDtor, NULL);
diff --git a/src/tree/Makefile.am b/src/tree/Makefile.am
index e28e6ed..83aad30 100644
--- a/src/tree/Makefile.am
+++ b/src/tree/Makefile.am
@@ -1,16 +1,19 @@
 ACLOCAL_AMFLAGS = -I m4
 AUTOMAKE_OPTIONS = subdir-objects
 
+AM_CFLAGS += -I../../include/ -std=c99 -DREENTRANT -lpthread
+AM_LDFLAGS += -lpthread
+
 TREE = tree.c \
+       tree_node.c \
        find.c \
        insert.c \
        delete.c \
        walk.c \
        destroy.c
 
-AM_CFLAGS += -I../../include/
-
 noinst_LTLIBRARIES = libtree.la
 
 libtree_la_SOURCES = $(TREE)
 libtree_la_CFLAGS  = $(AM_CFLAGS)
+libtree_la_LIBADD  = $(AM_LDFLAGS)
diff --git a/src/tree/delete.c b/src/tree/delete.c
index c23d44a..0275761 100644
--- a/src/tree/delete.c
+++ b/src/tree/delete.c
@@ -24,14 +24,15 @@
 #include "tr/tree.h"
 
 void *
-TR_treeDelete(TR_Tree * this, const void * search, TR_TreeComp comp)
+TR_treeDelete(TR_Tree this, const void * search, TR_TreeComp comp)
 {
-	TR_Tree node = *this;
-	TR_Tree del_node;
-	TR_Tree sibling;
-	int     found;
+	TR_TreeNode   node;
+	TR_TreeNode   del_node;
+	TR_TreeNode   sibling;
+	int           found;
+	void        * data;
 
-	void    * data;
+	node = this->root;
 
 	TR_TREE_FIND(node, search, found, comp);
 
@@ -57,7 +58,7 @@ TR_treeDelete(TR_Tree * this, const void * search, TR_TreeComp comp)
 	 * out inOrderSuccessor and remove the inOrderSuccessor.
 	 */
 	if (NULL != TR_TREE_LEFT(node) && NULL != TR_TREE_RIGHT(node)) {
-		TR_Tree successor;
+		TR_TreeNode successor;
 		
 		TR_TREE_INORDER_SUCC(node, successor);
 
@@ -66,12 +67,12 @@ TR_treeDelete(TR_Tree * this, const void * search, TR_TreeComp comp)
 	}
 
 	{
-		TR_Tree child = TR_TREE_CHILD(node);
+		TR_TreeNode child = TR_TREE_CHILD(node);
 
 		/*
 		 * if we still have one child replace ourself with it.
 		 */
-		TR_TREE_REPLACE_NODE(this, node, child);
+		TR_TREE_REPLACE_NODE(&(this->root), node, child);
 
 		/*
 		 * and finally delete the node...and prepare ourselfs
@@ -105,9 +106,10 @@ TR_treeDelete(TR_Tree * this, const void * search, TR_TreeComp comp)
 	 * rebalancing process...(this does not make much sense, but
 	 * to be honest I don't know now.)
 	 */
-	TR_TREE_BALANCE_DELETE(this, node, sibling);
+	TR_TREE_BALANCE_DELETE(&(this->root), node, sibling);
 
 	TR_delete(del_node);
+	
 	return data;
 }
 
diff --git a/src/tree/destroy.c b/src/tree/destroy.c
index 72c472f..204c5fb 100644
--- a/src/tree/destroy.c
+++ b/src/tree/destroy.c
@@ -24,12 +24,15 @@
 #include "tr/tree.h"
 
 void
-TR_treeDestroy(TR_Tree * this, TR_TreeAction action)
+TR_treeDestroy(TR_Tree this, TR_TreeAction action)
 {
-    TR_Tree previous = * this;
-    TR_Tree node     = * this;
-    int  depth    = 1;
+    TR_TreeNode previous;
+    TR_TreeNode node;
+    int         depth = 1;
     
+    previous = this->root;
+    node     = this->root;
+
     /*
      * I think this has something like O(n+log(n)) on a ballanced
      * tree because I have to traverse back the rightmost leaf to
@@ -44,7 +47,7 @@ TR_treeDestroy(TR_Tree * this, TR_TreeAction action)
 				|| previous == TR_TREE_LEFT(node)) && NULL == TR_TREE_RIGHT(node))
 				|| previous == TR_TREE_RIGHT(node)) {
             
-            TR_Tree parent = TR_TREE_PARENT(node);
+            TR_TreeNode parent = TR_TREE_PARENT(node);
             
 			if (action) {
 				action(node->data, NULL, depth);
@@ -82,7 +85,7 @@ TR_treeDestroy(TR_Tree * this, TR_TreeAction action)
         }
     }
 	
-	*this = NULL;
+	this->root = NULL;
 }
 
 // vim: set ts=4 sw=4:
diff --git a/src/tree/find.c b/src/tree/find.c
index 694eab4..ad3a2a1 100644
--- a/src/tree/find.c
+++ b/src/tree/find.c
@@ -25,11 +25,15 @@
 void *
 TR_treeFind(TR_Tree this, const void * search, TR_TreeComp comp)
 {
-	int found;
+	int           found;
+	TR_TreeNode   node;
+	void        * retval;
 
-	TR_TREE_FIND(this, search, found, comp);
+	node = this->root;
+	TR_TREE_FIND(node, search, found, comp);
+	retval = found == 0 ? node->data : NULL;
 
-	return found == 0 ? this->data : NULL;
+	return retval;
 }
 
 // vim: set ts=4 sw=4:
diff --git a/src/tree/insert.c b/src/tree/insert.c
index 4ff8b08..56a98d0 100644
--- a/src/tree/insert.c
+++ b/src/tree/insert.c
@@ -24,11 +24,14 @@
 #include "tr/tree.h"
 
 void *
-TR_treeInsert(TR_Tree * this, const void * search, TR_TreeComp comp)
+TR_treeInsert(TR_Tree this, const void * search, TR_TreeComp comp)
 {
-	TR_Tree node     = *this;
-	TR_Tree new_node = NULL;
-	int     found;
+	TR_TreeNode   new_node = NULL;
+	TR_TreeNode   node;
+	int           found;
+	void        * retval;
+
+	node = this->root;
 
 	/*
 	 * insert the node or return the one in tree if comparison
@@ -39,7 +42,7 @@ TR_treeInsert(TR_Tree * this, const void * search, TR_TreeComp comp)
 		 * if the root is NULL we simple add the element and set
 		 * node to it.
 		 */
-		*this = node = new_node = TR_new(TR_Tree, search);
+		this->root = node = new_node = TR_new(TR_TreeNode, search);
 	} else {
 		TR_TREE_FIND(node, search, found, comp);
 
@@ -55,11 +58,11 @@ TR_treeInsert(TR_Tree * this, const void * search, TR_TreeComp comp)
 		} else {
 			// not found
 			if (0 < found) {
-				node->left = TR_new(TR_Tree, search);
+				node->left = TR_new(TR_TreeNode, search);
 				node->left->parent = node;
 				node = new_node = node->left;
 			} else {
-				node->right = TR_new(TR_Tree, search);
+				node->right = TR_new(TR_TreeNode, search);
 				node->right->parent = node;
 				node = new_node = node->right;
 			}
@@ -70,9 +73,10 @@ TR_treeInsert(TR_Tree * this, const void * search, TR_TreeComp comp)
 	 * we expect node not to be NULL and pointing to our
 	 * new node at this point...now rabalance the tree
 	 */
-	TR_TREE_BALANCE_INSERT(this, node);
+	TR_TREE_BALANCE_INSERT(&(this->root), node);
+	retval = new_node->data;
 
-	return new_node->data;
+	return retval;
 }
 
 // vim: set ts=4 sw=4:
diff --git a/src/tree/tree.c b/src/tree/tree.c
index 7eeb635..9daf328 100644
--- a/src/tree/tree.c
+++ b/src/tree/tree.c
@@ -33,11 +33,7 @@ treeCtor(void * _this, va_list * params)
 {
 	TR_Tree this = _this;
 
-	this->data   = va_arg(*params, void *);
-	this->color  = rbRed;
-	this->parent = NULL;
-	this->left   = NULL;
-	this->right  = NULL;
+	this->root = NULL;
 
 	return 0;
 }
diff --git a/src/tree/tree_node.c b/src/tree/tree_node.c
new file mode 100644
index 0000000..1ac884a
--- /dev/null
+++ b/src/tree/tree_node.c
@@ -0,0 +1,50 @@
+/**
+ * \file
+ *
+ * \author	Georg Hopp
+ *
+ * \copyright
+ * Copyright © 2014 Georg Hopp
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#define _GNU_SOURCE
+
+#include <stdarg.h>
+
+#include "trbase.h"
+#include "tr/tree.h"
+
+static
+int
+treeNodeCtor(void * _this, va_list * params)
+{
+	TR_TreeNode this = _this;
+
+	this->data   = va_arg(*params, void *);
+	this->color  = rbRed;
+	this->parent = NULL;
+	this->left   = NULL;
+	this->right  = NULL;
+
+	return 0;
+}
+
+static void treeNodeDtor(void * _this) {}
+
+TR_INIT_IFACE(TR_Class, treeNodeCtor, treeNodeDtor, NULL);
+TR_CREATE_CLASS(TR_TreeNode, NULL, NULL, TR_IF(TR_Class));
+
+// vim: set ts=4 sw=4:
diff --git a/src/tree/walk.c b/src/tree/walk.c
index 72caff5..036b3ae 100644
--- a/src/tree/walk.c
+++ b/src/tree/walk.c
@@ -22,12 +22,16 @@
 
 #include "tr/tree.h"
 
-void
+unsigned long
 TR_treeWalk(TR_Tree this, const void * data, TR_TreeAction action)
 {
-	TR_Tree previous = this;
-	TR_Tree node     = this;
-	int  depth       = 1;
+	TR_TreeNode   previous;
+	TR_TreeNode   node;
+	int           depth     = 1;
+	unsigned long processed = 0;
+
+	previous = this->root;
+	node     = this->root;
 
 	while (NULL != node) {
 		if (previous == TR_TREE_RIGHT(node)) {
@@ -40,6 +44,7 @@ TR_treeWalk(TR_Tree this, const void * data, TR_TreeAction action)
 		if (NULL == TR_TREE_LEFT(node) || previous == TR_TREE_LEFT(node)) {
 			if (action) {
 				action(node->data, data, depth);
+				processed++;
 			}
 			previous = node;
 
@@ -56,6 +61,8 @@ TR_treeWalk(TR_Tree this, const void * data, TR_TreeAction action)
 			depth++;
 		}
 	}
+
+	return processed;
 }
 
 // vim: set ts=4 sw=4: