long timeout,
      TimeUnit unit,
      boolean interruptibly)
      throws InterruptedException {
    return interruptibly
        ? Queues.drain(q, buffer, numElements, timeout, unit)
        : Queues.drainUninterruptibly(q, buffer, numElements, timeout, unit);
  }

  public void testMultipleProducers() throws Exception {
    for (BlockingQueue<Object> q : blockingQueues()) {
      testMultipleProducers(q);
    }
  }

  @GwtIncompatible // BlockingQueue
  @IgnoreJRERequirement // Users will use this only if they're already using Duration
  public static <E> int drainUninterruptibly(
      BlockingQueue<E> q, Collection<? super E> buffer, int numElements, Duration timeout) {
    return drainUninterruptibly(q, buffer, numElements, toNanosSaturated(timeout), NANOSECONDS);
  }

  /**

   */
  @CanIgnoreReturnValue
  @J2ktIncompatible
  @GwtIncompatible // BlockingQueue
  public static <E> int drainUninterruptibly(
      BlockingQueue<E> q, Collection<? super E> buffer, int numElements, Duration timeout) {
    return drainUninterruptibly(q, buffer, numElements, toNanosSaturated(timeout), NANOSECONDS);
  }

  /**