问服务器和客户端套接字连接问题。send()、accept()和多线程

EN

#include <vector>
#include <boost/thread.hpp>
#include "unix_serverSocket.h"
#include "server.h"

extern const string socketAddress;


void do_stuff(ServerSocket *client)
{
    string in;
    string out;

    try
    {
        /* Gets input until the client closes the connection, then throws an exception, breaking out of the loop */
        while (true)
        {
            *client >> in;   /* Receives data from client socket connection */

            /* Assume the input is processed fine and returns the result into 'out' */

            sleep(3);   /* I've put sleep() here to test it's multithreading properly - it isn't */

            *client << out;   /* Returns result to client - send() is called here */

            /* If I put sleep() here instead it multithreads fine, so the server is waiting for send() before it accepts a new client */
        }
    }
    catch (SocketException &)
    {
        delete client;
        return;
    }
}


int main()
{
    try
    {
        ServerSocket server(socketAddress);

        while (true)
        {
            ServerSocket *client = new ServerSocket();

            /* See below */
            server.accept(*client);

            boost::thread newThread(do_stuff, client);
        }
    }
    catch (SocketException &e)
    {
        cout << "Error: " << e.description() << endl;
    }    

    return 0;
}

server.accept(*client);

ServerSocket *client = new ServerSocket();

class Socket
{
private:
    int sockfd;
    struct sockaddr_un local;

public:
    Socket();
    virtual ~Socket();

    bool create();
    bool bind(const string &);
    bool listen() const;
    bool accept(Socket &) const;

    bool send(const string &) const;
    int recv(string &) const;

    void close();

    bool is_valid() const 
    { 
        return sockfd != -1;
    }
};


bool Socket::create()
{
    sockfd = socket(AF_UNIX, SOCK_STREAM, 0);

    if (!is_valid())
    {
        return false;
    }

    int reuseAddress = 1;

    if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (const char*) &reuseAddress, sizeof(reuseAddress)) == -1)
    {
        return false;
    }

    return true;
}


bool Socket::bind(const string &socketAddress)
{
    if (!is_valid())
    {
        return false;
    }

    local.sun_family = AF_UNIX;
    strcpy(local.sun_path, socketAddress.c_str());
    unlink(local.sun_path);
    int len = strlen(local.sun_path) + sizeof(local.sun_family);

    int bind_return = ::bind(sockfd, (struct sockaddr *) &local, len);

    if (bind_return == -1)
    {
        return false;
    }

    return true;
}


bool Socket::listen() const
{
    if (!is_valid())
    {
        return false;
    }

    int listen_return = ::listen(sockfd, MAXCLIENTCONNECTIONS);

    if (listen_return == -1)
    {
        return false;
    }

    return true;
}


bool Socket::accept(Socket &socket) const
{
    int addr_length = sizeof(local);

    socket.sockfd = ::accept(sockfd, (sockaddr *) &local, (socklen_t *) &addr_length);

    if (socket.sockfd <= 0)
    {
        return false;
    }
    else
    {
        return true;
    }
}


int Socket::recv(string &str) const
{
    char buf[MAXRECV + 1];

    str = "";

    memset(buf, 0, MAXRECV + 1);

    int status = ::recv(sockfd, buf, MAXRECV, 0);

    if (status == -1)
    {
        cout << "status == -1   errno == " << errno << "  in Socket::recv" << endl;
        return 0;
    }
    else if (status == 0)
    {
        return 0;
    }
    else
    {
        str = buf;
        return status;
    }
}


bool Socket::send(const string &str) const
{
    int status = ::send(sockfd, str.c_str(), str.size(), MSG_NOSIGNAL);

    if (status == -1)
    {
        return false;
    }
    else
    {
        return true;
    }
}


class ServerSocket : private Socket
{
public:
    ServerSocket(const string &);
    ServerSocket() {};
    virtual ~ServerSocket();

    void accept(ServerSocket &);

    const ServerSocket & operator << (const string &) const;
    const ServerSocket & operator >> (string &) const;
};


ServerSocket::ServerSocket(const string &socketAddress)
{   
    if (!Socket::create())
    {
        throw SocketException("Could not create server socket");
    }

    if (!Socket::bind(socketAddress))
    {
        throw SocketException("Could not bind to port");
    }

    if (!Socket::listen())
    {
        throw SocketException("Could not listen to socket");
    }
}


void ServerSocket::accept(ServerSocket &socket)
{   
    if (!Socket::accept(socket))
    {
        throw SocketException("Could not accept socket");
    }
}


const ServerSocket & ServerSocket::operator << (const string &str) const
{   
    if (!Socket::send(str))
    {
        throw SocketException("Could not write to socket");
    }

    return *this;
}


const ServerSocket & ServerSocket::operator >> (string &str) const
{
    if (!Socket::recv(str))
    {
        throw SocketException("Could not read from socket");
    }

    return *this;
}