if (guard.monitor != this) {
      throw new IllegalMonitorStateException();
    }
    ReentrantLock lock = this.lock;
    boolean signalBeforeWaiting = lock.isHeldByCurrentThread();
    lock.lockInterruptibly();

    boolean satisfied = false;
    try {
      if (!guard.isSatisfied()) {
        await(guard, signalBeforeWaiting);
      }
      satisfied = true;

    @Override
    public LockGraphNode getLockGraphNode() {
      return lockGraphNode;
    }

    @Override
    public boolean isAcquiredByCurrentThread() {
      return isHeldByCurrentThread();
    }

    ///// Overridden ReentrantLock methods. /////

    @Override
    public void lock() {
      aboutToAcquire(this);
      try {
        super.lock();
      } finally {