func Register(s Shutdownable) {
	lock.Lock()
	defer lock.Unlock()
	registered = append(registered, s)
}
func Register(s Shutdownable) {
	lock.Lock()
	defer lock.Unlock()
	registered = append(registered, s)
}
func Register ( s Shutdownable ) { lock . Lock ( ) defer lock . Unlock ( ) registered = append ( registered , s ) }
// Register registers an item as shutdownable
Register registers an item as shutdownable