正在销毁服务器实例:ASIO C++

引用HTTP服务器-单线程实现我正在尝试显式控制服务器实例的生存期

我的要求是：

1) I should be able to explicitly destroy the server

2) I need to keep multiple Server Instances alive which should listen to different ports

3) Manager Class maintains list of all active server instances; should be able to create and destroy the server instances by create and drop methods

我正在努力实现要求1，并且我想出了一个代码：

    void server::stop()
    {
        DEBUG_MSG("Stopped");
        io_service_.post(boost::bind(&server::handle_stop, this));
    }

其中handle_stop()是

void server::handle_stop()
    {
        // The server is stopped by cancelling all outstanding asynchronous
        // operations. Once all operations have finished the io_service::run() call
        // will exit.
        acceptor_.close();
        connection_manager_.stop_all();
    }

我试着从main()将其称为：

try
{
    http::server::server s("127.0.0.1","8973");
    // Run the server until stopped.
    s.run();
    boost::this_thread::sleep_for(boost::chrono::seconds(3));
    s.stop();
}
catch (std::exception& e)
{
    std::cerr << "exception: " << e.what() << "n";
}

问题1）我无法拨打server::handle_stop()。

我想io_service_.run()正在阻止我的s.stop()呼叫。

void server::run()
{
    // The io_service::run() call will block until all asynchronous operations
    // have finished. While the server is running, there is always at least one
    // asynchronous operation outstanding: the asynchronous accept call waiting
    // for new incoming connections.
    io_service_.run();
}

如何继续？

问题2:对于需求2），我需要multiple server instances，我认为我需要在main中创建一个io_service instance，并且必须将相同的实例传递给所有server instances。我说得对吗？

每个流程必须有only one io_service instance吗？我可以有多个吗？

编辑

我的目标是实现一个可以控制多服务器实例的类：

以下类型的东西（错误的代码//只是给出视图，我试图实现什么）我想要实现-我该如何设计？

我对io_Service以及如何干净地调用mng.create()、mng.drop() 感到困惑

  Class Manager{
    public:
    void createServer(ServerPtr)
    {
     list_.insert(make_shared<Server> (ip, port));
    }
    void drop()
    {
    list_.drop((ServerPtr));
    }
    private:
    io_service iO_;
    set<server> list_;
    };

    main()
    {
    io_service io;
    Manager mng(io);
    mng.createServer(ip1,port1);
    mng.createServer(ip2,port2);
    io.run();
    mng.drop(ip1,port1);
    }