/**
* <tt>null</tt> if not owned. When this method is called by a thread that is not the owner, the
* return value reflects a best-effort approximation of current lock status. For example, the
* owner may be momentarily <tt>null</tt> even if there are threads trying to acquire the lock but
* have not yet done so. This method is designed to facilitate construction of subclasses that
* provide more extensive lock monitoring facilities.
*
* @return the owner, or <tt>null</tt> if not owned
*/
protected Thread getOwner() {
return sync.getOwner();
}
