--- a/src/parallel_execution/context.h	Thu Nov 17 18:34:39 2016 +0000
+++ b/src/parallel_execution/context.h	Fri Nov 18 19:34:44 2016 +0900
@@ -151,6 +151,7 @@
     } Time;
     struct LoopCounter {
         int i;
+        struct Tree* tree;
     } loopCounter;
     struct Worker {
         int num;
@@ -171,14 +172,14 @@
         struct Queue* waitMe;
         struct Queue* waitI;
         int idsCount;
-    } task;
+    } Task;
     struct Queue {
         struct Element* first;
         struct Element* last;
         int count;
         union Data* queue;
         enum Code next;
-    } queue;
+    } Queue;
     // Stack Interface
     struct Stack {
         union Data* stack;
@@ -215,12 +216,13 @@
         int* array;
     } array;
     struct Tree {
-        union Data* tree
+        union Data* tree;
+        struct Node* node;
         enum Code put;
         enum Code get;
         enum Code remove;
         enum Code next;
-    } tree;
+    } Tree;
     struct Traverse {
         struct Node* root;
         struct Node* current; // reading node of original tree

--- a/src/parallel_execution/main.c	Thu Nov 17 18:34:39 2016 +0000
+++ b/src/parallel_execution/main.c	Fri Nov 18 19:34:44 2016 +0900
@@ -146,7 +146,7 @@
             waitMe,
             waitI,
             &context->data[D_Element]->element,
-            &context->data[D_ActiveQueue]->queue);
+            &context->data[D_ActiveQueue]->Queue);
 }
 
 
@@ -220,7 +220,7 @@
     goto putQueue2(context,
             &context->data[context->dataNum]->element,
             &context->data[D_Element]->element,
-            &context->data[D_Queue]->queue);
+            &context->data[D_Queue]->Queue);
 }
 
 __code putQueue3(struct Context* context, struct Queue* queue, struct Element* new_element) {
@@ -237,7 +237,7 @@
 }
 
 __code putQueue3_stub(struct Context* context) {
-    goto putQueue3(context, &context->data[D_Queue]->queue, &context->data[context->dataNum]->element);
+    goto putQueue3(context, &context->data[D_Queue]->Queue, &context->data[context->dataNum]->element);
 }
 
 __code putQueue4(struct Context* context, struct Queue* queue, struct Element* new_element) {
@@ -252,7 +252,7 @@
 }
 
 __code putQueue4_stub(struct Context* context) {
-    goto putQueue4(context, &context->data[D_Queue]->queue, &context->data[context->dataNum]->element);
+    goto putQueue4(context, &context->data[D_Queue]->Queue, &context->data[context->dataNum]->element);
 }
 
 __code createWorker(struct Context* context, struct LoopCounter* loopCounter, struct Worker* worker) {

--- a/src/parallel_execution/stack.cbc	Thu Nov 17 18:34:39 2016 +0000
+++ b/src/parallel_execution/stack.cbc	Fri Nov 18 19:34:44 2016 +0900
@@ -90,8 +90,19 @@
     union Data* data, *data1;
 
     if (stack->top) {
-zsh:1: command not found: nkf
-
+        data = stack->top->data;
+        if (stack->top->next) {
+            data1 = stack->top->next->data;
+        } else {
+            data1 = NULL;
+        }
+    } else {
+        data = NULL;
+        data1 = NUll;
+    }
+    goto next(data, data1, ...);
+}
+    
 __code isEmptySingleLinkedStack(struct SingleLinkedStack* stack, __code next(...), __code whenEmpty(...)) {
     if (stack->top)
         goto next(...);