updateTime := 30*time.Second + time.Duration(float64(10*time.Second)*rand.Float64())
		t := time.NewTicker(updateTime)
		defer t.Stop()
		defer saverWg.Done()
		var lastSave time.Time

		for {
			select {
			case <-t.C:
				if cache.Info.LastUpdate.Equal(lastSave) {
					continue
				}
				scannerLogOnceIf(ctx, cache.save(ctx, er, dataUsageCacheName), "nsscanner-cache-update")
				updates <- cache.clone()

			return
		}
		if m, _, _ := isIndexedMetaV2(metadata); m != nil && !m.AllHidden(true) {
			objsReturned++
		}
	}
	send := func(entry metaCacheEntry) error {
		objReturned(entry.metadata)
		select {
		case <-ctx.Done():
			return ctx.Err()
		case out <- entry:
		}
		return nil
	}

	// Fast exit track to check if we are listing an object with

				// Do not return io.EOF
				if resCh != nil {
					resErr = nil
					select {
					case resCh <- results:
					case <-ctx.Done():
					}
					resCh = nil
					returned = true
				}
				continue
			}
			results.o = append(results.o, entry)
		}
		if resCh != nil {
			resErr = io.EOF
			select {
			case <-ctx.Done():
				// Nobody wants it.
			case resCh <- results:
			}

			}
			continue
		}
		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
				}
			}

	tolerance = len(restClnts) - quorum
	attempt := uint(0)

	for {
		select {
		case <-ctx.Done():
			return false
		default:
			// Try to acquire the lock.
			if locked = lock(ctx, dm.clnt, &locks, id, source, isReadLock, tolerance, quorum, dm.Names...); locked {
				dm.m.Lock()

		currentGlobalBuffer, ok := logChBuffers[name]
		logChLock.Unlock()
		if !ok {
			return
		}

		for _, v := range entries {
			select {
			case currentGlobalBuffer <- v:
			default:
			}
		}

		if mainWorker {
		drain:
			for {
				select {
				case v, ok := <-h.logCh:
					if !ok {
						break drain
					}

					currentGlobalBuffer <- v
				default:
					break drain

					}
					continue
				}

				tracker.updateProgress(res.success, res.skipped, res.bytes)
			}
		}()

		send := func(result healEntryResult) bool {
			select {
			case <-ctx.Done():
				if !contextCanceled(ctx) {
					healingLogIf(ctx, ctx.Err())
				}
				return false
			case results <- result:
				return true
			}
		}

		code:       "ParseEmptySelect",
		message:    "The SQL expression contains an empty SELECT.",
		statusCode: 400,
		cause:      err,
	}
}

func errParseSelectMissingFrom(err error) *s3Error {
	return &s3Error{
		code:       "ParseSelectMissingFrom",
		message:    "The SQL expression contains a missing FROM after SELECT list.",
		statusCode: 400,
		cause:      err,
	}
}

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

	c := make(chan ioret[V], 1)
	go func() {
		v, err := work(ctx)
		c <- ioret[V]{val: v, err: err}
	}()

	select {
	case v := <-c:
		return v.val, v.err
	case <-ctx.Done():
		var zero V
		return zero, ctx.Err()
	}
}

// DeadlineWorker implements the deadline/timeout resiliency pattern.

		if r.Header.Get(globalObjectPerfUserMetadata) == "" {
			if val := globalServiceFreeze.Load(); val != nil {
				if unlock, ok := val.(chan struct{}); ok && unlock != nil {
					// Wait until unfrozen.
					select {
					case <-unlock:
					case <-r.Context().Done():
						// if client canceled we don't need to wait here forever.
						return
					}
				}
			}
		}