closeClientSocket();
Socket sock=client_sock; if (sock != null && !sock.isClosed()) closeClientSocket();
        public void run() {            try {                synchronized(mutex) {                    if(client_sock == null)                        return;                    in=client_sock.getInputStream();                }                while((in.read()) != -1) {                }            }            catch(IOException io_ex1) {            }            finally {                closeClientSocket();                synchronized(clients) {                    clients.remove(this);                }            }        }