void unlink(Node<E> p, Node<E> trail) {
    // assert isFullyLocked();
    // p.next is not changed, to allow iterators that are
    // traversing p to maintain their weak-consistency guarantee.
    p.item = null;
    trail.next = p.next;
    if (last == p) {
      last = trail;
    }
    if (count.getAndDecrement() == capacity) {
      notFull.signal();
    }
  }
Unlinks interior Node p with predecessor trail.
geode-core/src/main/java/org/apache/geode/internal/cache/ForceableLinkedBlockingQueue.java