func HammerMutex(m *DRWMutex, loops int, cdone chan bool) {
	for range loops {
		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
	}
	c := make(chan bool)
	m := NewDRWMutex(ds, "test")
	for range 10 {
		go HammerMutex(m, loops, c)
	}
	for range 10 {
		<-c

	if err != nil {
		return nil, err
	}
	exp := argP.Expand()

	if node == "" {
		for index, e := range exp {
			result = append(result, localDisk{index: index, path: strings.Join(e, "")})
		}
	} else {
		for index, e := range exp {
			u, err := url.Parse(strings.Join(e, ""))
			if err != nil {
				return nil, err
			}
			if strings.Contains(u.Host, node) {

		for za0004 := range z.PartNumbers {
			o = msgp.AppendInt(o, z.PartNumbers[za0004])
		}
		// string "PartETags"
		o = append(o, 0xa9, 0x50, 0x61, 0x72, 0x74, 0x45, 0x54, 0x61, 0x67, 0x73)
		if z.PartETags == nil { // allownil: if nil
			o = msgp.AppendNil(o)
		} else {
			o = msgp.AppendArrayHeader(o, uint32(len(z.PartETags)))
			for za0005 := range z.PartETags {

	buckets := make(map[string][]MetricV2, v2MetricsMaxBuckets)
	for promMetric := range ch {
		dtoMetric := &dto.Metric{}
		err := promMetric.Write(dtoMetric)
		if err != nil {
			// Log error and continue to receive other metric
			// values
			bugLogIf(GlobalContext, err)
			continue
		}

		h := dtoMetric.GetHistogram()
		for _, b := range h.Bucket {
			labels := make(map[string]string)

		return errInvalidArgument
	}

	nv := make(textproto.MIMEHeader, len(v))
	for k, kv := range v {
		// Canonicalize all headers, to remove any duplicates.
		nv[http.CanonicalHeaderKey(k)] = kv
	}

	// Save all supported headers.
	for _, supportedHeader := range supportedHeaders {
		value, ok := nv[http.CanonicalHeaderKey(supportedHeader)]
		if ok {

	}
	if len(args.UID) == 0 {
		for _, resource := range args.Resources {
			lris, ok := l.lockMap[resource]
			if !ok {
				continue
			}
			// Collect uids, so we don't mutate while we delete
			uids := make([]string, 0, len(lris))
			for _, lri := range lris {
				uids = append(uids, lri.UID)
			}

			// Delete collected uids:
			for _, uid := range uids {
				lris, ok := l.lockMap[resource]
				if !ok {

	// as "{path#}/src/" into trimStrings
	for _, goPathString := range goPathList {
		trimStrings = append(trimStrings, filepath.Join(goPathString, "src")+string(filepath.Separator))
	}

	for _, goRootString := range goRootList {
		trimStrings = append(trimStrings, filepath.Join(goRootString, "src")+string(filepath.Separator))
	}

	for _, defaultgoPathString := range defaultgoPathList {

			})
			// Keep first metacacheMaxEntries...
			for _, cache := range remainCaches[metacacheMaxEntries:] {
				if time.Since(cache.lastHandout) > metacacheMaxClientWait {
					remove[cache.id] = struct{}{}
				}
			}
		}
	}

	for id := range remove {
		b.deleteCache(id)
	}
}

// updateCacheEntry will update a cache.
// Returns the updated status.

func testStorageAPIDiskInfo(t *testing.T, storage StorageAPI) {
	testCases := []struct {
		expectErr bool
	}{
		{true},
	}

	for i, testCase := range testCases {
		_, err := storage.DiskInfo(t.Context(), DiskInfoOptions{Metrics: true})
		expectErr := (err != nil)

		if expectErr != testCase.expectErr {

		if getRIndex(sorted, c.name) == -1 {
			sorted = append(sorted, c.name)
		}

		return nil
	}

	for _, c := range cs {
		if err = sortCallback(c); err != nil {
			return
		}
	}

	for _, name := range sorted {
		if idx := getRIndex(names, name); !cs[idx].remove {
			fns = append(fns, cs[idx].handler)
		}
	}

	return
}