void remove(int fd){
synchronized (updateLock) {
    setUpdateEvents(fd,KILLED,false);
    if (registered.get(fd)) {
      epollCtl(epfd,EPOLL_CTL_DEL,fd,0);
      registered.clear(fd);
    }
  }
}

void remove ( int fd ) { synchronized ( updateLock ) { setUpdateEvents ( fd , KILLED , false ) ; if ( registered . get ( fd ) ) { epollCtl ( epfd , EPOLL_CTL_DEL , fd , 0 ) ; registered . clear ( fd ) ; } } }
remove a file descriptor
