sys.iamRefreshInterval = iamRefreshInterval
	// Initialize IAM store
	sys.initStore(objAPI, etcdClient)
	sys.Unlock()

	retryCtx, cancel := context.WithCancel(ctx)

	// Indicate to our routine to exit cleanly upon return.
	defer cancel()

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

	// Migrate storage format if needed.
	for {
		// Migrate IAM configuration, if necessary.

	}

	pr, pw := xioutil.WaitPipe()
	go func() {
		pw.CloseWithError(er.getObjectWithFileInfo(ctx, bucket, object, off, length, pw, fi, metaArr, onlineDisks))
	}()

	// Cleanup function to cause the go routine above to exit, in
	// case of incomplete read.
	pipeCloser := func() {
		pr.CloseWithError(nil)
	}

	if !unlockOnDefer {
		return fn(pr, h, pipeCloser, nsUnlocker)
	}

		globalLeaderLock = newSharedLock(GlobalContext, z, "leader.lock")
	})

	// Enable background operations on
	//
	// - Disk auto healing
	// - MRF (most recently failed) healing
	// - Background expiration routine for lifecycle policies
	bootstrapTrace("initAutoHeal", func() {
		initAutoHeal(GlobalContext, z)
	})

	bootstrapTrace("initHealMRF", func() {
		go globalMRFState.healRoutine(z)
	})

	cpuSubsystem              MetricSubsystem = "cpu_avg"
	storageClassSubsystem     MetricSubsystem = "storage_class"
	fileDescriptorSubsystem   MetricSubsystem = "file_descriptor"
	goRoutines                MetricSubsystem = "go_routine"
	ioSubsystem               MetricSubsystem = "io"
	nodesSubsystem            MetricSubsystem = "nodes"
	objectsSubsystem          MetricSubsystem = "objects"
	bucketsSubsystem          MetricSubsystem = "bucket"

		refreshInterval:      drwMutexRefreshInterval,
		lockRetryMinInterval: lockRetryMinInterval,
	}
}

// Lock holds a write lock on dm.
//
// If the lock is already in use, the calling go routine
// blocks until the mutex is available.
func (dm *DRWMutex) Lock(id, source string) {
	isReadLock := false
	dm.lockBlocking(context.Background(), nil, id, source, isReadLock, Options{
		Timeout: drwMutexInfinite,

	case <-locked:
		t.Error("unexpected unblocking")
	case <-time.After(100 * time.Millisecond):
	}

	// unlock
	if err = dupl.Close(); err != nil {
		t.Fatal(err)
	}

	// the previously blocked routine should be unblocked
	select {
	case <-locked:
	case <-time.After(1 * time.Second):
		t.Error("unexpected blocking")
	}

		return madmin.ServiceActionRestart
	case stopCmd:
		return madmin.ServiceActionStop
	}
	return madmin.ServiceActionRestart
}

// testServiceSignalReceiver - Helper function that simulates a
// go-routine waiting on service signal.
func testServiceSignalReceiver(cmd cmdType, t *testing.T) {
	expectedCmd := cmd.toServiceSignal()
	serviceCmd := <-globalServiceSignalCh
	if serviceCmd != expectedCmd {

)

const (
	processLocksReadTotal           = "locks_read_total"
	processLocksWriteTotal          = "locks_write_total"
	processCPUTotalSeconds          = "cpu_total_seconds"
	processGoRoutineTotal           = "go_routine_total"
	processIORCharBytes             = "io_rchar_bytes"
	processIOReadBytes              = "io_read_bytes"
	processIOWCharBytes             = "io_wchar_bytes"
	processIOWriteBytes             = "io_write_bytes"

	sendLog(ctx, entry)
}

// ErrCritical is the value panic'd whenever CriticalIf is called.
var ErrCritical struct{}

// CriticalIf logs the provided error on the console. It fails the
// current go-routine by causing a `panic(ErrCritical)`.
func CriticalIf(ctx context.Context, err error, errKind ...interface{}) {
	if err != nil {
		LogIf(ctx, "", err, errKind...)
		panic(ErrCritical)
	}
}

				nsMutex:            mutex,
			}
		}(i)
	}

	wg.Wait()

	// start cleanup stale uploads go-routine.
	go s.cleanupStaleUploads(ctx)

	// start cleanup of deleted objects.
	go s.cleanupDeletedObjects(ctx)

	// Start the disk monitoring and connect routine.
	if !globalIsTesting {
		go s.monitorAndConnectEndpoints(ctx, defaultMonitorConnectEndpointInterval)
	}

	return s, nil
}