* if the task completed with an error.
       */
      V get() throws CancellationException, ExecutionException, InterruptedException {

        // Acquire the shared lock allowing interruption.
        acquireSharedInterruptibly(-1);
        return getValue();
      }

      /**
       * Implementation of the actual value retrieval. Will return the value on success, an

       * if the task completed with an error.
       */
      V get() throws CancellationException, ExecutionException, InterruptedException {

        // Acquire the shared lock allowing interruption.
        acquireSharedInterruptibly(-1);
        return getValue();
      }

      /**
       * Implementation of the actual value retrieval. Will return the value on success, an