Method PushFront

base/TaskQueue.h:30–35

        }

        void PushFront(const T& element) {
            std::unique_lock<std::mutex> lock(_block_mutex);
            _full_notify.wait(_block_mutex, [this]() {return this->_block_queue.size() < this->_list_size; });
            _block_queue.push_front(element);
            _empty_notify.notify_all();
        }

        T Pop() {
            std::unique_lock<std::mutex> lock(_block_mutex);