diff --git a/data_structures/list/lockfree_list2.hpp b/data_structures/list/lockfree_list2.hpp
deleted file mode 100644
index a9d762cff..000000000
--- a/data_structures/list/lockfree_list2.hpp
+++ /dev/null
@@ -1,71 +0,0 @@
-#ifndef MEMGRAPH_DATA_STRUCTURES_LOCKFREE_LIST2_HPP
-#define MEMGRAPH_DATA_STRUCTURES_LOCKFREE_LIST2_HPP
-
-#include <atomic>
-
-#include "threading/sync/spinlock.hpp"
-#include "threading/sync/lockable.hpp"
-
-namespace lockfree
-{
-
-template <class T>
-class List2 : Lockable<SpinLock>
-{
-    struct Node { T value; std::atomic<Node*> next; };
-
-    class iterator
-    {
-        iterator(Node* node) : node(node) {}
-
-        T& operator*() const { return *node; }
-        T* operator->() const { return node; }
-
-        bool end() const
-        {
-            return node == nullptr;
-        }
-
-        iterator& operator++()
-        {
-            node = node->next.load(std::memory_order_relaxed);
-            return *this;
-        }
-
-        iterator& operator++(int)
-        {
-            return operator++();
-        }
-
-    protected:
-        Node* node;
-    };
-
-public:
-
-    ~List2()
-    {
-        Node* next, node = head.load(std::memory_order_relaxed);
-
-        for(; node != nullptr; node = next)
-        {
-            next = node->next;
-            delete node;
-        }
-    }
-
-    void insert(T value)
-    {
-        auto guard = acquire();
-        head.store(new Node { value, head });
-    }
-
-    iterator begin() { return iterator(head.load()); }
-
-private:
-    std::atomic<Node*> head;
-};
-
-}
-
-#endif
diff --git a/promise.cpp b/promise.cpp
new file mode 100644
index 000000000..8df711aef
--- /dev/null
+++ b/promise.cpp
@@ -0,0 +1,115 @@
+#include <iostream>
+#include <atomic>
+
+#include "server/uv/uv.hpp"
+#include "server/http/http.hpp"
+
+template <class T, class... Args>
+class Promise
+{
+public:
+    Promise(std::function<T(Args...)> f, Args&&... args)
+    {
+        result = f(std::forward<Args>(args)...);
+    }
+
+    template <class R>
+    Promise<R, T> then(std::function<R(T)> f)
+    {
+        return Promise(f, std::forward<T>(result));
+    }
+
+    T get()
+    {
+        return result;
+    }
+
+private:
+    
+
+    T result;
+    std::atomic<bool> completed;
+};
+
+class TaskPool
+{
+    template <class R, class... Args>
+    class Task
+    {
+    public:
+        using task_t = Task<R, Args...>;
+        using work_f = std::function<R(Args...)>;
+        using after_work_f = std::function<void(R)>;
+
+        Task(work_f work, after_work_f callback)
+            : work(work), callback(callback)
+        {
+            req.data = this;
+        }
+
+        void launch(uv::UvLoop& loop)
+        {
+            uv_queue_work(loop, &req, work_cb, after_work_cb);
+        }
+
+    private:
+        std::function<R(Args...)> work;
+        std::function<void(R&)> callback;
+
+        R result;
+
+        uv_work_t req;
+
+        static void work_cb(uv_work_t* req)
+        {
+            auto& task = *reinterpret_cast<task_t*>(req->data);
+        }
+
+        static void after_work_cb(uv_work_t* req, int)
+        {
+            auto task = reinterpret_cast<task_t>(req->data);
+            delete task;
+        }
+    };
+
+public:
+    TaskPool(uv::UvLoop& loop) : loop(loop) {}
+
+    template <class R, class...Args>
+    void launch(std::function<R(Args...)> func,
+             std::function<void(R&)> callback)
+    {
+        auto task = new Task<R, Args...>(func, callback);
+        task->launch(loop);
+    }
+
+private:
+    uv::UvLoop& loop;
+};
+
+
+
+int main(void)
+{
+    uv::UvLoop loop;
+    TaskPool tp(loop);
+    
+    tp.launch([](void) -> int { return 3 }, 
+              [](int x) -> void { std::cout << x << std::endl; });
+
+//    http::HttpServer server(loop);
+//
+//    http::Ipv4 ip("0.0.0.0", 3400);
+//
+//    server.listen(ip, [](http::Request& req, http::Response& res) {
+//
+//
+//        
+//        res.send(req.url);
+//    });
+//
+//    loop.run(uv::UvLoop::Mode::Default);
+
+
+    return 0;
+}
diff --git a/threading/sync/timed_spinlock.hpp b/threading/sync/timed_spinlock.hpp
index 5758843b6..77eb6aa3d 100644
--- a/threading/sync/timed_spinlock.hpp
+++ b/threading/sync/timed_spinlock.hpp
@@ -12,6 +12,7 @@ class LockExpiredError : public std::runtime_error
     using runtime_error::runtime_error;
 };
 
+template <size_t microseconds = 250>
 class TimedSpinLock
 {
 public:
@@ -36,7 +37,7 @@ public:
             if(clock::now() - start > expiration)
                 throw LockExpiredError("This lock has expired");
 
-            usleep(250);
+            usleep(microseconds);
         }
     }
 
diff --git a/threading/task.hpp b/threading/task.hpp
deleted file mode 100644
index d5be264c3..000000000
--- a/threading/task.hpp
+++ /dev/null
@@ -1,12 +0,0 @@
-#ifndef MEMGRAPH_THREADING_TASK_HPP
-#define MEMGRAPH_THREADING_TASK_HPP
-
-class Task
-{
-public:
-
-private:
-    //std::function<
-};
-
-#endif
diff --git a/utils/mark_ref.hpp b/utils/mark_ref.hpp
new file mode 100644
index 000000000..b98d5c731
--- /dev/null
+++ b/utils/mark_ref.hpp
@@ -0,0 +1,45 @@
+#ifndef MEMGRAPH_UTILS_MARK_REF_HPP
+#define MEMGRAPH_UTILS_MARK_REF_HPP
+
+#include <stdint.h>
+
+template <class T>
+struct MarkRef
+{
+    MarkRef() = default;
+    MarkRef(MarkRef&) = default;
+    MarkRef(MarkRef&&) = default;
+
+    bool is_marked() const
+    {
+        return ptr & 0x1L;
+    }
+
+    bool set_mark()
+    {
+        return ptr |= 0x1L;
+    }
+
+    bool clear_mark()
+    {
+        return ptr &= ~0x1L;
+    }
+
+    T* get() const
+    {
+        return reinterpret_cast<T*>(ptr & ~0x1L);
+    }
+
+    T& operator*() { return *get(); }
+    T* operator->() { return get(); }
+
+    uintptr_t ptr;
+};
+
+//template <class T, class... Args>
+//MarkRef<T> make_markref(Args&&... args)
+//{
+//
+//}
+
+#endif