*/
  @J2ktIncompatible
  @GwtIncompatible // concurrency
  @IgnoreJRERequirement // Users will use this only if they're already using Duration.
  public static void joinUninterruptibly(Thread toJoin, Duration timeout) {
    joinUninterruptibly(toJoin, toNanosSaturated(timeout), TimeUnit.NANOSECONDS);
  }

  /**
   * Invokes {@code unit.}{@link TimeUnit#timedJoin(Thread, long) timedJoin(toJoin, timeout)}

              return;
            }
          }
        };
    waiter.start();
    awaitTimedWaiting(waiter);
    service.shutdown();
    Uninterruptibles.joinUninterruptibly(waiter, 10, SECONDS);
    if (waiter.isAlive()) {
      waiter.interrupt();
      fail("awaitTermination failed to trigger after shutdown()");
    }
  }

              return;
            }
          }
        };
    waiter.start();
    awaitTimedWaiting(waiter);
    service.shutdown();
    Uninterruptibles.joinUninterruptibly(waiter, 10, SECONDS);
    if (waiter.isAlive()) {
      waiter.interrupt();
      fail("awaitTermination failed to trigger after shutdown()");
    }
  }

            }
          });
      threads.add(thread);
    }
    for (Thread t : threads) {
      t.start();
    }
    for (Thread t : threads) {
      Uninterruptibles.joinUninterruptibly(t);
    }
    return exceptions;
  }

  private static int getNonGoldenRandomKey() {
    int key;
    do {
      key = random.get().nextInt();
    } while (key == GOLDEN_PRESENT_KEY);