diff --git a/Assignment_3/lib/ADT_Stack.cpp b/Assignment_3/lib/ADT_Stack.cpp
index 7e1c042..8604d71 100644
--- a/Assignment_3/lib/ADT_Stack.cpp
+++ b/Assignment_3/lib/ADT_Stack.cpp
@@ -65,3 +65,22 @@ void ADTStack::do_ops(std::vector<operation> ops) {
     }
 }
 
+void ADTOperationQueue::enqueue(operation op) {
+    mutex.lock();
+    queue.push(op);
+    mutex.unlock();
+}
+operation ADTOperationQueue::dequeue() {
+    mutex.lock();
+    operation op = this->queue.front();
+    queue.pop();
+    mutex.unlock();
+    return op;
+}
+size_t ADTOperationQueue::size() {
+    this->mutex.lock();
+    size_t s = queue.size();
+    this->mutex.unlock();
+    return s;
+}
+
diff --git a/Assignment_3/lib/ADT_Stack.h b/Assignment_3/lib/ADT_Stack.h
index 9a6a64a..e9b53ed 100644
--- a/Assignment_3/lib/ADT_Stack.h
+++ b/Assignment_3/lib/ADT_Stack.h
@@ -1,5 +1,7 @@
 #include <stack>
 #include <vector>
+#include <mutex>
+#include <queue>
 
 enum methodname {push, pop, size, noop};
 typedef struct _operation{
@@ -18,4 +20,14 @@ class ADTStack {
         void size(int output);
         void do_op(operation * op);
         void do_ops(std::vector<operation> ops);
+};
+
+class ADTOperationQueue{
+  private:
+    std::queue<operation> queue;
+    std::mutex mutex;
+  public:
+    void enqueue(operation op);
+    operation dequeue();
+    size_t size();
 };
\ No newline at end of file