Increments the count of unstarted threads in the thread group.
Unstarted threads are not added to the thread group so that they
can be collected if they are never started, but they must be
counted so that daemon thread groups with unstarted threads in
them are not destroyed.
Increments the count of unstarted threads in the thread group. Unstarted threads are not added to the thread group so that they can be collected if they are never started, but they must be counted so that daemon thread groups with unstarted threads in them are not destroyed.