t.Fatal("Unlock timed out, which should not happen")
	case <-timer.C:
	}
}

// Borrowed from mutex_test.go
func HammerMutex(m *DRWMutex, loops int, cdone chan bool) {
	for i := 0; i < loops; i++ {
		m.Lock(id, source)
		m.Unlock(context.Background())
	}
	cdone <- true
}

// Borrowed from mutex_test.go
func TestMutex(t *testing.T) {
	loops := 200
	if testing.Short() {
		loops = 5
	}

		wg.Add(1)
		go func(ctx context.Context, peerChannel <-chan MetricV2, wg *sync.WaitGroup) {
			defer wg.Done()
			for {
				select {
				case m, ok := <-peerChannel:
					if !ok {
						return
					}
					select {
					case ch <- m:
					case <-ctx.Done():
						return
					}
				case <-ctx.Done():
					return
				}
			}
		}(ctx, peerChannels[index], &wg)
	}

		return err
	}
	ctx, done, err := p.TrackDiskHealth(ctx, storageMetricWalkDir, opts.Bucket, opts.BaseDir)
	if err != nil {
		return err
	}
	defer done(&err)

	return p.storage.WalkDir(ctx, opts, wr)
}

// WalkDir will traverse a directory and return all entries found.
// On success a meta cache stream will be returned, that should be closed when done.

    return new TrackedRunnable() {
      private volatile boolean done = false;

      @Override
      public boolean isDone() {
        return done;
      }

      @Override
      public void run() {
        try {
          delay(timeoutMillis);
          done = true;
        } catch (InterruptedException ok) {
        }
      }
    };
  }

	if maxProcs < len(disks) {
		disks = disks[:maxProcs]
	}

	// Start one scanner per disk
	var wg sync.WaitGroup
	wg.Add(len(disks))

	for i := range disks {
		go func(i int) {
			defer wg.Done()
			disk := disks[i]

			for bucket := range bucketCh {
				select {
				case <-ctx.Done():
					return
				default:
				}

				// Load cache for bucket

                if (!dataCrawlingThreadList.get(i).isRunning() && Constants.RUNNING.equals(dataCrawlingThreadStatusList.get(i))) {
                    dataCrawlingThreadStatusList.set(i, Constants.DONE);
                }
                if (!Constants.DONE.equals(dataCrawlingThreadStatusList.get(i))) {
                    finishedAll = false;
                }
            }
        }
        dataCrawlingThreadList.clear();

    do {
      System.runFinalization();
      if (predicate.isDone()) {
        return;
      }
      CountDownLatch done = new CountDownLatch(1);
      createUnreachableLatchFinalizer(done);
      await(done);
      if (predicate.isDone()) {
        return;
      }
    } while (System.nanoTime() - deadline < 0);
    throw formatRuntimeException(

        }
      } finally {
        // Null out the thread field, so that we don't leak a reference to Thread, and so that
        // future `thread == currentThread()` calls from this thread don't incorrectly queue instead
        // of executing. Don't null out the latestTaskQueue field, because the work done here
        // may have scheduled more operations on another thread, and if those operations then

    public volatile boolean done = false;

    public void run() {
      try {
        delay(LONG_DELAY_MS);
        done = true;
      } catch (InterruptedException ok) {
      }
    }
  }

  public static class TrackedNoOpRunnable implements Runnable {
    public volatile boolean done = false;

    public void run() {
      done = true;
    }
  }

// Listen - listen on peers.
func (client *peerRESTClient) Listen(ctx context.Context, listenCh chan<- []byte, v url.Values) {
	go func() {
		for {
			client.doListen(ctx, listenCh, v)
			select {
			case <-ctx.Done():
				return
			default:
				// There was error in the REST request, retry after sometime as probably the peer is down.
				time.Sleep(5 * time.Second)
			}
		}
	}()
}