/**
* Adds an entry at the end of the list of which this item is the head. @GuardedBy("manager.lock")
*/
final void addLast(InternalJob entry) {
InternalJob last = this;
// find the end of the queue
while (last.previous != null) last = last.previous;
// add the new entry to the end of the queue
last.previous = entry;
entry.next = last;
entry.previous = null;
}
