Question

我使用Boost ASIO创建了一个服务器。它构建得很好，但是一旦运行它就会产生分段错误。无法真正弄清楚这种行为。

另外，我读到这可能是因为我没有明确初始化io_service对象。如果，那就是这种情况，那么我该如何修改这段代码，以便我不必从课堂外传递io_service对象。

以下是我的代码：

#include <iostream>
#include <string>
#include <memory>
#include <array>
#include <boost/asio.hpp>

using namespace boost::asio;

//Connection Class

class Connection : public std::enable_shared_from_this<Connection>{

    ip::tcp::socket m_socket;
    std::array<char, 2056> m_acceptMessage;
    std::string m_acceptMessageWrapper;
    std::string m_buffer;
public:
    Connection(io_service& ioService): m_socket(ioService) {    }

    virtual ~Connection() { }

    static std::shared_ptr<Connection> create(io_service& ioService){
        return std::shared_ptr<Connection>(new Connection(ioService));
    }


    std::string& receiveMessage() {
         size_t len = boost::asio::read(m_socket, boost::asio::buffer(m_acceptMessage));
         m_acceptMessageWrapper = std::string(m_acceptMessage.begin(), m_acceptMessage.begin() + len);
         return m_acceptMessageWrapper;
    }

    void sendMessage(const std::string& message) {
         boost::asio::write(m_socket, boost::asio::buffer(message));
    }

    ip::tcp::socket& getSocket(){
        return m_socket;
    }

};



//Server Class

class Server {
  ip::tcp::acceptor m_acceptor;
  io_service m_ioService ;


public:
    Server(int port):
        m_acceptor(m_ioService, ip::tcp::endpoint(ip::tcp::v4(), port)){    }

    virtual ~Server() { }

    std::shared_ptr<Connection> createConnection(){
        std::shared_ptr<Connection> newConnection = Connection::create(m_ioService);
        m_acceptor.accept(newConnection->getSocket());
        return newConnection;
    }

    void runService() {
        m_ioService.run();
    }


};


int main(int argc, char* argv[]) {
    Server s(5000);
    auto c1 = s.createConnection();
    //do soething
    s.runService();
    return 0;
}

Answer 1

您正面临初始化订单问题。在您的班级Server中，您已在m_acceptor之前声明m_ioService并使用未初始化的io_service对象构建acceptor。

只需重新排序类中的声明。令人惊讶的是clang没有对此发出任何警告。

class Server {
  io_service m_ioService ;
  ip::tcp::acceptor m_acceptor;


public:
    Server(int port):
        m_acceptor(m_ioService, ip::tcp::endpoint(ip::tcp::v4(), port)){    }

    virtual ~Server() { }

    std::shared_ptr<Connection> createConnection(){
        std::shared_ptr<Connection> newConnection = Connection::create(m_ioService);
        m_acceptor.accept(newConnection->getSocket());
        return newConnection;
    }

    void runService() {
        m_ioService.run();
    }


};

提升ASIO服务器分段故障

1 个答案: