socket select编程问题，大家帮助看一下

Question

WINAPI Tcp_ROUTINE(LPVOID pm)
主要是这个线程中的select
FD_ZERO(&fdread);
        FD_SET(Tcpserver, &fdread);
        tv.tv_sec = 2;
        tv.tv_usec = 0;
        select(0, &fdread, NULL, NULL, &tv);
        nSize = sizeof(tcp_adderSrv);
        if (FD_ISSET(Tcpserver, &fdread))
        {
 
             sercoon=accept(Tcpserver,(SOCKADDR*)&clientadd,&nSize);
             ioctlsocket(sercoon, FIONBIO, &iMode);
             ret = send(sercoon,(char*)&draw,sizeof(draw)+1,0);
             if (ret=SOCKET_ERROR)
             {
                 std::cout<<"send error"<<std::endl;
             }
             memset(&draw,0,sizeof(draw));
         }
        else
        {