ASIO（io_context和多thread）--接上一篇

线程池，第二个实例
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多线程 Echo Server

**
使用的线程池，和上一节一样的AsioIoContextPool，这里我就直接贴实例代码，有不懂的欢迎留言

server.h

#ifndef SERVER_H
#define SERVER_H

#include <iostream>
#include "ioContextPool.h"

using namespace boost::asio::ip;

class session
        :public std::enable_shared_from_this<session>
{
public:
    session(tcp::socket socket);
    void start();
private:
    void do_read();
    void do_write(std::size_t length);

private:
    tcp::socket socket_;
    enum {max_length = 1024};
    char data_[max_length];
};

class Server
{
public:
    Server(boost::asio::io_context& io_context, short port);

private:
    void do_accept();
    tcp::acceptor acceptor_;
};

#endif // SERVER_H

server.cpp

#include "server.h"

session::session(tcp::socket socket)
    :socket_(std::move(socket))
{

}

void session::start()
{
    do_read();
}

void session::do_read()
{
    auto self(shared_from_this());
    socket_.async_read_some(boost::asio::buffer(data_,max_length),
                            [this,self](boost::system::error_code ec,std::size_t length)
    {
        if(!ec)
            do_write(length);
    });
}

void session::do_write(std::size_t length)
{
    auto self(shared_from_this());
    boost::asio::async_write(socket_,boost::asio::buffer(data_,length),
                             [this,self](boost::system::error_code ec,std::size_t )
    {
        if(!ec)
            do_read();
    });
}

Server::Server(boost::asio::io_context &io_context, short port)
    :acceptor_(io_context,tcp::endpoint(tcp::v4(),port))
{
    do_accept();
}

void Server::do_accept()
{
    acceptor_.async_accept(
                [this](boost::system::error_code ec, tcp::socket socket)
    {
        if(!ec)
            std::make_shared<session>(std::move(socket))->start();
        do_accept();
    });
}

main函数

int main(int argc, char* argv[])
{
  try
  {
    if (argc != 2)
    {
      std::cerr << "Usage: async_tcp_echo_server <port>\n";
      return 1;
    }
    AsioIoContextPool pool;

    Server s(pool.getIOCOntext(), std::atoi(argv[1]));
    pool.stop(); //这里一定要调用该函数，使线程处于join状态
  }
  catch (std::exception& e)
  {
    std::cerr << "Exception: " << e.what() << "\n";
  }

  return 0;
}

欢迎批评指正