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110 lines
3.0 KiB
C++
110 lines
3.0 KiB
C++
//
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// daytime_client.cpp
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// ~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2013 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#include <iostream>
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#include <boost/array.hpp>
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#include <boost/asio/io_service.hpp>
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#include <boost/asio/ip/udp.hpp>
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#include <boost/bind.hpp>
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#include <boost/ref.hpp>
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#include <boost/system/system_error.hpp>
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#include <boost/fiber/all.hpp>
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#include "use_ffuture.hpp"
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using boost::asio::ip::udp;
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void get_daytime(boost::asio::io_service& io_service, const char* hostname)
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{
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try
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{
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udp::resolver resolver(io_service);
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boost::fibers::future<udp::resolver::iterator> iter =
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resolver.async_resolve(
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udp::resolver::query( udp::v4(), hostname, "daytime"),
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boost::asio::use_ffuture);
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// The async_resolve operation above returns the endpoint iterator as a
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// future value that is not retrieved ...
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udp::socket socket(io_service, udp::v4());
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boost::array<char, 1> send_buf = {{ 0 }};
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boost::fibers::future<std::size_t> send_length =
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socket.async_send_to(boost::asio::buffer(send_buf),
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*iter.get(), // ... until here. This call may block.
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boost::asio::use_ffuture);
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// Do other things here while the send completes.
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send_length.get(); // Blocks until the send is complete. Throws any errors.
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boost::array<char, 128> recv_buf;
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udp::endpoint sender_endpoint;
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boost::fibers::future<std::size_t> recv_length =
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socket.async_receive_from(
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boost::asio::buffer(recv_buf),
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sender_endpoint,
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boost::asio::use_ffuture);
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// Do other things here while the receive completes.
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std::cout.write(
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recv_buf.data(),
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recv_length.get()); // Blocks until receive is complete.
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}
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catch (boost::system::system_error& e)
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{
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std::cerr << e.what() << std::endl;
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}
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io_service.stop();
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}
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int main(int argc, char* argv[])
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{
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boost::fibers::round_robin ds;
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boost::fibers::scheduling_algorithm( & ds);
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try
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{
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if (argc != 2)
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{
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std::cerr << "Usage: daytime_client <host>" << std::endl;
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return 1;
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}
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// We run the io_service off in its own thread so that it operates
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// completely asynchronously with respect to the rest of the program.
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boost::asio::io_service io_service;
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boost::asio::io_service::work work(io_service);
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#if 0
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//boost::thread tsk([&io_service](){ io_service.run(); });
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boost::fibers::fiber tsk([&io_service](){ io_service.run(); }); // blocks main-thread
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get_daytime(io_service, argv[1]);
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io_service.stop();
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tsk.join();
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#endif
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//std::thread tsk( boost::bind( get_daytime, boost::ref( io_service), argv[1]) );
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boost::fibers::fiber tsk( boost::bind( get_daytime, boost::ref( io_service), argv[1]) );
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io_service.run();
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tsk.join();
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}
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catch (std::exception& e)
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{
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std::cerr << e.what() << std::endl;
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}
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return 0;
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}
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