Method ExecOne

include/cli/loopscheduler.h:84–100

    }

    bool ExecOne()
    {
        std::function<void()> task;
        {
            std::unique_lock<std::mutex> lck(mtx);
            cv.wait(lck, [this](){ return !running || !tasks.empty(); });
            if (!running)
                return false;
            task = tasks.front();
            tasks.pop();
        }

        if (task)
            task();

        return true;
    }

    bool PollOne()
    {