Managers    []*Manager
	Mux         []*mux.Router
	Hosts       []string
	cleanupOnce sync.Once
	cancel      context.CancelFunc
}

// SetupTestGrid creates a new grid for testing purposes.
// Select the number of hosts to create.
// Call (TestGrid).Cleanup() when done.
func SetupTestGrid(n int) (*TestGrid, error) {
	hosts, listeners, err := getHosts(n)
	if err != nil {
		return nil, err
	}
	dialer := &net.Dialer{

	for k, v := range reqParams {
		if header, ok := supportedHeadGetReqParams[strings.ToLower(k)]; ok {
			w.Header()[header] = []string{strings.Join(v, ",")}
		}
	}
}

// SelectObjectContentHandler - GET Object?select
// ----------
// This implementation of the GET operation retrieves object content based
// on an SQL expression. In the request, along with the sql expression, you must

	r := rand.New(rand.NewSource(time.Now().UnixNano()))

	retryCtx, cancel := context.WithTimeout(ctx, timeout)
	defer cancel()

	for {
		select {
		case <-retryCtx.Done():
			// Caller context canceled or we timedout,
			// return false anyways for both situations.
			return false
		default:
			if lm.lock(id, source, isWriteLock) {
				return true

	for _, f := range tformats {
		t, err = time.Parse(f, s)
		if err == nil {
			break
		}
	}
	return
}

// FormatSQLTimestamp - returns the a string representation of the
// timestamp as used in S3 Select
func FormatSQLTimestamp(t time.Time) string {
	_, zoneOffset := t.Zone()
	hasZone := zoneOffset != 0
	hasFracSecond := t.Nanosecond() != 0
	hasSecond := t.Second() != 0
	hasTime := t.Hour() != 0 || t.Minute() != 0

		for {
			c.connChange.Wait()
			newState := c.State()
			select {
			case changed <- newState:
				if newState == StateConnected || newState == StateShutdown {
					c.connChange.L.Unlock()
					return
				}
			case <-ctx.Done():
				c.connChange.L.Unlock()
				return
			}
		}
	}()

	for {
		select {
		case <-ctx.Done():
			return context.Cause(ctx)

					for {
						select {
						case <-ctx.Done():
							return
						case v, ok := <-in:
							if !ok {
								return
							}
							input := h.NewRequest()
							_, err := input.UnmarshalMsg(v)
							if err != nil {
								gridLogOnceIf(ctx, err, err.Error())
							}
							PutByteBuffer(v)
							// Send input
							select {
							case <-ctx.Done():
								return

	sys.RUnlock()
	// send last n console log messages in order filtered by node
	if cnt > 0 {
		for i := 0; i < last; i++ {
			entry := lastN[(cnt+i)%last]
			if (entry == log.Info{}) {
				continue
			}
			select {
			case subCh <- entry:
			case <-doneCh:
				return nil
			}
		}
	}
	return sys.pubsub.Subscribe(madmin.LogMaskAll, subCh, doneCh, filter)
}

		objAPI := newObjectLayerFn()
		for objAPI == nil {
			time.Sleep(time.Second)
			objAPI = newObjectLayerFn()
		}

		t := time.NewTicker(time.Minute)
		defer t.Stop()

		var exit bool
		for !exit {
			select {
			case <-t.C:
			case <-GlobalContext.Done():
				exit = true
			}
			m.mu.RLock()
			for _, v := range m.buckets {
				if !exit {
					v.cleanup()
				}
			}
			m.mu.RUnlock()
			m.mu.Lock()

			}
			if ok {
				continue
			}
		} // in all other cases metadata is corrupt, do not read from it.

		onlineMeta[i] = FileInfo{}
		onlineDisks[i] = nil
	}

	select {
	case mrfCheck <- fi.ShallowCopy():
	case <-ctx.Done():
		return fi, onlineMeta, onlineDisks, toObjectErr(ctx.Err(), bucket, object)
	}

	return fi, onlineMeta, onlineDisks, nil
}

	s := SRStats{
		M:               make(map[string]*SRStatus),
		movingAvgTicker: time.NewTicker(time.Second * 2),
	}
	go s.trackEWMA()
	return &s
}

func (sr *SRStats) trackEWMA() {
	for {
		select {
		case <-sr.movingAvgTicker.C:
			sr.updateMovingAvg()
		case <-GlobalContext.Done():
			return
		}
	}
}

func (sr *SRStats) updateMovingAvg() {
	sr.lock.Lock()
	defer sr.lock.Unlock()