diff --git a/src/common/functionpool.cpp b/src/common/functionpool.cpp
deleted file mode 100644
index 894afa97a..000000000
--- a/src/common/functionpool.cpp
+++ /dev/null
@@ -1,61 +0,0 @@
-#include "functionpool.hpp"
-
-#include <iostream>
-
-namespace kb {
-namespace viz2d {
-namespace detail {
-
-FunctionPool::FunctionPool() :
-        m_function_queue(), m_lock(), m_data_condition(), m_accept_functions(true) {
-}
-
-FunctionPool::~FunctionPool() {
-}
-
-void FunctionPool::push(std::function<void()> func) {
-    std::unique_lock<std::mutex> lock(m_lock);
-    m_function_queue.push(func);
-    // when we send the notification immediately, the consumer will try to get the lock , so unlock asap
-    lock.unlock();
-    m_data_condition.notify_one();
-}
-
-void FunctionPool::done() {
-    std::unique_lock<std::mutex> lock(m_lock);
-    m_accept_functions = false;
-    lock.unlock();
-    // when we send the notification immediately, the consumer will try to get the lock , so unlock asap
-    m_data_condition.notify_all();
-    //notify all waiting threads.
-}
-
-void FunctionPool::infinite_loop_func() {
-    std::function<void()> func;
-    while (true) {
-        try {
-            {
-                std::unique_lock<std::mutex> lock(m_lock);
-                m_data_condition.wait(lock, [this]() {
-                    return !m_function_queue.empty() || !m_accept_functions;
-                });
-                if (!m_accept_functions && m_function_queue.empty()) {
-                    //lock will be release automatically.
-                    //finish the thread loop and let it join in the main thread.
-                    return;
-                }
-                func = m_function_queue.front();
-                m_function_queue.pop();
-                //release the lock
-            }
-            func();
-        } catch(std::exception& ex) {
-            std::cerr << ex.what() << std::endl;
-        }
-    }
-
-}
-
-} /* namespace detail */
-} /* namespace viz2d */
-} /* namespace kb */
diff --git a/src/common/functionpool.hpp b/src/common/functionpool.hpp
deleted file mode 100644
index 2019965b5..000000000
--- a/src/common/functionpool.hpp
+++ /dev/null
@@ -1,37 +0,0 @@
-//started with https://stackoverflow.com/a/51400041/1884837
-#ifndef SRC_COMMON_FUNCTIONPOOL_HPP_
-#define SRC_COMMON_FUNCTIONPOOL_HPP_
-
-#include <queue>
-#include <functional>
-#include <mutex>
-#include <condition_variable>
-#include <atomic>
-#include <cassert>
-
-namespace kb {
-namespace viz2d {
-namespace detail {
-
-class FunctionPool {
-
-private:
-    std::queue<std::function<void()>> m_function_queue;
-    std::mutex m_lock;
-    std::condition_variable m_data_condition;
-    std::atomic<bool> m_accept_functions;
-
-public:
-
-    FunctionPool();
-    ~FunctionPool();
-    void push(std::function<void()> func);
-    void done();
-    void infinite_loop_func();
-};
-
-} /* namespace detail */
-} /* namespace viz2d */
-} /* namespace kb */
-
-#endif /* SRC_COMMON_FUNCTIONPOOL_HPP_ */