Method timer_callback

lib_fiber/samples-c++1x/aio_server/main.cpp:268–278

@override

	// @override
	void timer_callback(unsigned int id) override {
		time_t now = time(nullptr);
		delay_ += 1000000;
		this->set_task(id_, delay_);

		printf("timer id=%u, delay=%ld, next delay=%lld\r\n",
			id, (long) (now - last_), delay_);

		last_ = now;
		id_ = id;
	}

private:
	unsigned int id_;