--- a/src/parallel_execution/context.h	Tue Jan 26 06:47:35 2016 +0900
+++ b/src/parallel_execution/context.h	Tue Jan 26 07:46:26 2016 +0900
@@ -55,6 +55,7 @@
     PutQueue2,
     PutQueue3,
     PutQueue4,
+    GetQueue,
     Exit,
 };
 
@@ -68,6 +69,7 @@
     Worker,
     Allocate,
     Tree,
+    Traverse,
     Node,
     LoopCounter,
     Element,
@@ -86,8 +88,6 @@
     stack_ptr node_stack;
     int dataNum;
     union Data **data;
-    struct Queue* activeQueue;
-    struct Tree* tree;
 };
 
 union Data {
@@ -116,11 +116,12 @@
         int* array;
     } array;
     struct Tree {
-        enum Code next;
         struct Node* root;
+    } tree;
+    struct Traverse {
         struct Node* current;
         int result;
-    } tree;
+    } traverse;
     struct Node {
         // need to tree
         enum Code next;