# if

#include <boost/asio.hpp>

#include <boost/thread.hpp>

#include <iostream> 

void handler1(const boost::system::error_code &ec)

{

    std::cout << "5 s." << std::endl;

} 

void handler2(const boost::system::error_code &ec)

{

    std::cout << "5 s." << std::endl;

} 

boost::asio::io_service io_service; 

void run()

{

    io_service.run();

} 

/*

两个线程调用run运行同一个服务，当第一服务在阻塞时，可以再第二个线程里面执行

但这样会使得使用std::cout混乱，开线程要注意，开过多的线程是没有意义的

*/

int main()

{

    boost::asio::deadline_timer timer1(io_service, boost::posix_time::seconds());

    timer1.async_wait(handler1);

    boost::asio::deadline_timer timer2(io_service, boost::posix_time::seconds());

    timer2.async_wait(handler2);

    boost::thread thread1(run);

    boost::thread thread2(run);

    thread1.join();

    thread2.join();

}

#endif

#if 0

#include <boost/asio.hpp>

#include <boost/thread.hpp>

#include <iostream> 

void handler1(const boost::system::error_code &ec)

{

    std::cout << "5 s." << std::endl;

} 

void handler2(const boost::system::error_code &ec)

{

    std::cout << "5 s." << std::endl;

} 

boost::asio::io_service io_service1;

boost::asio::io_service io_service2; 

void run1()

{

    io_service1.run();

} 

void run2()

{

    io_service2.run();

} 

/*

第二种方法不是多个线程运行同一个服务，而是创建多个服务，每个服务用同一个线程，如果线程数与内核数相同，在一个核上面不回出现竞争现象

*/

int main()

{

    boost::asio::deadline_timer timer1(io_service1, boost::posix_time::seconds());

    timer1.async_wait(handler1);

    boost::asio::deadline_timer timer2(io_service2, boost::posix_time::seconds());

    timer2.async_wait(handler2);

    boost::thread thread1(run1);

    boost::thread thread2(run2);

    thread1.join();

    thread2.join();

} 

#endif

//简单客户端请求

#if 0

#include <boost/asio.hpp>

#include <boost/array.hpp>

#include <iostream>

#include <string>

boost::asio::io_service io_service;

boost::asio::ip::tcp::resolver resolver(io_service);

boost::asio::ip::tcp::socket sock(io_service);

boost::array<char, > buffer;

/**

 *@brief 读回调，当读完时read_handler内部产生错误，不回循环调用了

 */

void read_handler(const boost::system::error_code& ec, std::size_t bytes_transferred)

{

    if (!ec)

    {

        std::cout << std::string(buffer.data(), bytes_transferred) << std::endl;

        //必须的，因为可能包没接完，和read_handler交替运行

        sock.async_read_some(boost::asio::buffer(buffer), read_handler);

    }

}

void connect_handler(const boost::system::error_code& ec)

{

    if (!ec)

    {

        //发送http请求，

        boost::asio::write(sock, boost::asio::buffer("GET / HTTP 1.1\r\nHost: highscore.de\r\n\r\n"));

        //启动数据的接收,接收数据保存在buffer中，回调read_handler

        sock.async_read_some(boost::asio::buffer(buffer), read_handler);

    }

}

/**

 *@brief 域名解析回调

 *@param it 解析后地址

 */

void resolver_handler(const boost::system::error_code& ec, boost::asio::ip::tcp::resolver::iterator it)

{

    if (!ec)

    {

        //访问IO对象sock，建立连接

        sock.async_connect(*it, connect_handler);

    }

}

int main()

{

    boost::asio::ip::tcp::resolver::query query("www.highscore.de", "");//新建一个查询，域名为...,端口为80

    resolver.async_resolve(query, resolver_handler);//解析域名为ip

    io_service.run();//将控制权交给操作系统进行异步操作

    getchar();

}

#endif

//简单的服务器接收例子

#if 0

#include <boost/asio.hpp>

#include <string>

boost::asio::io_service io_service;

//接收端口配置，从80端口等待v4类型的ip

boost::asio::ip::tcp::endpoint endpoint(boost::asio::ip::tcp::v4(), );

boost::asio::ip::tcp::acceptor acceptor(io_service, endpoint);

boost::asio::ip::tcp::socket sock(io_service);

std::string data = "HTTP/1.1 200 OK\r\nContent-Length: 13\r\n\r\nHello, world!"; 

void write_handler(const boost::system::error_code& ec, std::size_t bytes_transferred)

{

}

void accept_handler(const boost::system::error_code& ec)

{

    if (!ec)

    {

        //async_write_some函数也能发送数据，但这个函数只要发送一个字节就会回调函数，

        //因为将整个数据发送完毕异步操作才算完毕，async_write函数在发送完毕调用write_handler

        //这个和libevent机制差不多

        boost::asio::async_write(sock, boost::asio::buffer(data), write_handler);

    }

}

int main()

{

    acceptor.listen();//监听，将接收器配置成接收状态

    acceptor.async_accept(sock, accept_handler);//等待接收

    io_service.run();

}

#endif