C++ io_service::run_one方法代码示例

	void thread_fun()
	{
		for (;;)
		{
			error_code ec;
			tcp::endpoint from;
			tcp::socket socket(m_ios);
			condition_variable cond;
			bool done = false;
			m_acceptor.async_accept(socket, from, boost::bind(&new_connection, _1, &ec, &done));
			while (!done)
			{
				m_ios.run_one();
				m_ios.reset();
			}

			if (ec == boost::asio::error::operation_aborted
				|| ec == boost::asio::error::bad_descriptor) return;

			if (ec)
			{
				fprintf(stderr, "Error accepting connection on peer socket: %s\n", ec.message().c_str());
				return;
			}

			fprintf(stderr, "%s: incoming peer connection\n", time_now_string());
			++m_peer_requests;
			socket.close(ec);
		}
	}

inline void run_service( boost::asio::io_service & io_service) {
    h_timer timer( io_service, boost::chrono::seconds(0) );
    timer.async_wait( boost::bind( timer_handler, boost::ref( timer) ) );
    while (true)
    {
        boost::system::error_code ec;
        std::size_t num = io_service.run_one(ec);
        if (num == 0)
        {
            return;
        }
        boost::this_fiber::yield();
    }
}

	void thread_fun()
	{
		char buffer[2000];
	
		for (;;)
		{
			error_code ec;
			udp::endpoint from;
			size_t bytes_transferred;
			bool done = false;
			m_socket.async_receive_from(
				asio::buffer(buffer, sizeof(buffer)), from, 0
				, boost::bind(&incoming_packet, _1, _2, &bytes_transferred, &ec, &done));
			while (!done)
			{
				m_ios.run_one();
				m_ios.reset();
			}

			if (ec == boost::asio::error::operation_aborted
				|| ec == boost::asio::error::bad_descriptor) return;

			if (ec)
			{
				fprintf(stderr, "Error receiving on DHT socket: %s\n", ec.message().c_str());
				return;
			}

			try
			{
				entry msg = bdecode(buffer, buffer + bytes_transferred);

#if defined TORRENT_DEBUG && TORRENT_USE_IOSTREAM
				std::cerr << msg << std::endl;
#endif
				++m_dht_requests;
			}
			catch (std::exception& e)
			{
				fprintf(stderr, "failed to decode DHT message: %s\n", e.what());
			}
		}
	}

static inline void avloop_run(boost::asio::io_service& io_service)
{
	using namespace ::detail;

	if (!boost::asio::has_service<IdleService>(io_service))
		boost::asio::add_service(io_service, new IdleService(io_service));

	while (!io_service.stopped())
	{
		if(!boost::asio::use_service<IdleService>(io_service).has_idle())
		{
			if (!io_service.run_one())
				break;
		}
		else
		{
			while (io_service.poll());
			// 执行 idle handler!
			boost::asio::use_service<IdleService>(io_service).poll_one();
		}
	}
}

        service( boost::asio::io_service & io_svc) :
            boost::asio::io_service::service( io_svc),
            work_{ new boost::asio::io_service::work( io_svc) } {
            io_svc.post([&io_svc](){
//]
//[asio_rr_service_lambda
                while ( ! io_svc.stopped() ) {
                    if ( boost::fibers::has_ready_fibers() ) {
                        // run all pending handlers in round_robin
                        while ( io_svc.poll() );
                        // run pending (ready) fibers
                        this_fiber::yield();
                    } else {
                        // run one handler inside io_service
                        // if no handler available, block this thread
                        if ( ! io_svc.run_one() ) {
                            break;
                        }
                    }
                }
//]
//[asio_rr_service_bottom
            });
        }