socket能连接不能收发消息

  <TCP_SOCKET>为什么建立好连接后而不能收发消息   ；  请问下  下面代码有什么问题吗？        
                 while (1)
                        {
                                bzero (buf ,BUFSIZ);
                                ret=read (newfd,buf,BUFSIZ);
                                if (ret<0)
                                {
                                        perror ("read error\n");
                                        break;
                                }
                                printf ("data from server:%s\n",buf);
                        }
                while (1)
                        {
                                bzero (buf,BUFSIZ);
                                wrt=write (newfd,buf,BUFSIZ);
                                if (wrt<0)
                                {
                                        perror ("write error\n");
                                        break;
                                }
                        }

两个while(1)，还指望第二个执行?
另外socket是阻塞滴