template<typename T>
class NodeListWithLock
{
private:
    T _data;
    std::mutex _mux;

public:
    NodeListWithLock<T> _next;

public:
    NodeListWithLock(T data);
    T data();

    void lock_node();
    void unlock_node();
};

...

template<typename T>
void NodeListWithLock<T>::lock_node()
{
    this->_mux.lock();
}

template<typename T>
void NodeListWithLock<T>::unlock_node()
{
    this->_mux.unlock();
}