c++中socket编程中的Select()总是给出时间错误

我有这个套接字程序，它有发送和接收的两个部分，但当我使用select时，它总是返回"时间错误"。下面是代码

void server::run(){
int RetVal;
    struct timeval *tp=new timeval;
    tp->tv_sec=300;
    tp->tv_usec=500000;
    fd_set readfds;
    FD_ZERO(&readfds);
    FD_SET(sock,&readfds);
    FD_SET(sock1,&readfds);
    cout<<"run() is working fine";
    if((RetVal=select(1,&readfds,NULL,NULL,tp))==SOCKET_ERROR)  //check for incoming packets.
                {
                    cout<< "Timer error!";
                    Sleep(50);
    }
    else if(RetVal>0)   //There are incoming packets.
            {
           if(FD_ISSET(sock1, &readfds))    //incoming packet from peer host 1
         {
           send();
          }
            else if(FD_ISSET(sock, &readfds))   //incoming packet from peer host 1
           {
              send1();
          }
         else{
            cout<<"no port is open to communicate";
         }
}
}
server::server(){
WSADATA wsadata;
try{
    if (WSAStartup(0x0202,&wsadata)!=0)
        throw"Starting WSAStartup() errorn";
    //Display name of local host
    if(gethostname(servername,HOSTNAME_LENGTH)!=0) //get the hostname
        throw"Get the host name error,exit";
}
catch(char *str){
    cerr<<str<<":"<<WSAGetLastError()<<endl;
}
    printf("Server: %s waiting to be contacted for time/size request...n",servername);
}
server::~server(){
    WSACleanup();
}
void server::send(){
try{
        if ((sock= socket(AF_INET, SOCK_STREAM, 0)) == SOCKET_ERROR)
        {
            cout<< "SERVER: socket unable to initializen";
        }
        servers.sin_family = AF_INET;
        servers.sin_port = htons(port);
        servers.sin_addr.s_addr = INADDR_ANY;
        if (bind(sock, (sockaddr*)&servers, sizeof(servers)) == SOCKET_ERROR)
        {
            cout<<"SERVER: Cant Bind the Socket";
            closesocket(sock);
        }
       if (listen(sock, MAXPENDING) == SOCKET_ERROR)
        //if((value=listen(sock, MAXPENDING))==SOCKET_ERROR)
       {
            cout<<"SERVER: listening socket not open";
            closesocket(sock);
       }

       if ((clientSock= accept(sock, 0, 0)) == SOCKET_ERROR)
       {
           throw"SERVER: connection not accepted";
       }

       if ((nBytes= send(clientSock, "Hello", 20, 0)) == SOCKET_ERROR)
       {
           throw"SERVER: data sending failed ";
       }
    }
    catch(char *str){
    cerr<<str<<":"<<WSAGetLastError()<<endl;
    }
       closesocket(clientSock);
       closesocket(sock);
       }
void server::send1(){
try{
        if ((sock1= socket(AF_INET, SOCK_STREAM, 0)) == SOCKET_ERROR)
        {
            throw "SERVER: socket unable to initializen";
        }
        servers.sin_family = AF_INET;
        servers.sin_port = htons(port);
        servers.sin_addr.s_addr = INADDR_ANY;
        if (bind(sock1, (sockaddr*)&servers, sizeof(servers)) == SOCKET_ERROR)
        {
            throw"SERVER: Cant Bind the Socket";
            closesocket(sock1);
        }
       if (listen(sock1, MAXPENDING) == SOCKET_ERROR)
       {
            throw "SERVER: listening socket not open";
            closesocket(sock1);
       }
       cout << "SERVER: Ready to run now...";
       if ((clientSock= accept(sock1, 0, 0)) == SOCKET_ERROR)
       {
           throw"SERVER: connection not accepted";
       }

       if ((nBytes= send(clientSock, "Hello", 20, 0)) == SOCKET_ERROR)
       {
           throw"SERVER: data sending failed ";
       }
    }
    catch(char *str){
    cerr<<str<<":"<<WSAGetLastError()<<endl;
    }
       closesocket(clientSock);
       closesocket(sock1);

}

我已经尝试了很多东西，但我的select()总是返回相同的东西。我的程序在没有run()和select()的情况下工作正常，如果我直接调用send和recv()，其工作正常。