interrupted = true;
        }
      }
    } finally {
      if (interrupted) {
        Thread.currentThread().interrupt();
      }
    }
  }

  /** Unblocks all threads and runs all listeners. */
  private static void complete(AbstractFuture<?> param, boolean callInterruptTask) {
    // Declare a "true" local variable so that the Checker Framework will infer nullness.