if len(ps.subs) != 2 {
		t.Fatalf("expected 2 subscribers")
	}
	if want, got := int32(2), ps.NumSubscribers(Mask(1)); got != want {
		t.Fatalf("want %d subscribers, got %d", want, got)
	}
	if want, got := int32(2), ps.NumSubscribers(Mask(2)); got != want {
		t.Fatalf("want %d subscribers, got %d", want, got)
	}
	if want, got := int32(2), ps.NumSubscribers(Mask(1|2)); got != want {
		t.Fatalf("want %d subscribers, got %d", want, got)

	types  Mask
	filter func(entry T) bool
}

// PubSub holds publishers and subscribers
type PubSub[T Maskable, M Maskable] struct {
	// atomics, keep at top:
	types          uint64
	numSubscribers int32
	maxSubscribers int32

	// not atomics:
	subs []*Sub[T]
	sync.RWMutex
}

// Publish message to the subscribers.
// Note that publish is always non-blocking send so that we don't block on slow receivers.

	doTestParallelReaders(1, 4)
	doTestParallelReaders(3, 4)
	doTestParallelReaders(4, 2)
}

// Borrowed from rwmutex_test.go
func reader(rwm *LRWMutex, numIterations int, activity *int32, cdone chan bool) {
	for i := 0; i < numIterations; i++ {
		if rwm.GetRLock(context.Background(), "", "", time.Second) {
			n := atomic.AddInt32(activity, 1)
			if n < 1 || n >= 10000 {

	}
	return apiStats
}

// HTTPStats holds statistics information about
// HTTP requests made by all clients
type HTTPStats struct {
	s3RequestsInQueue       int32 // ref: https://golang.org/pkg/sync/atomic/#pkg-note-BUG
	_                       int32 // For 64 bits alignment
	s3RequestsIncoming      uint64
	rejectedRequestsAuth    uint64
	rejectedRequestsTime    uint64
	rejectedRequestsHeader  uint64

	doTestParallelReaders(1, 4)
	doTestParallelReaders(3, 4)
	doTestParallelReaders(4, 2)
}

// Borrowed from rwmutex_test.go
func reader(resource string, numIterations int, activity *int32, cdone chan bool) {
	rwm := NewDRWMutex(ds, resource)
	for i := 0; i < numIterations; i++ {
		if rwm.GetRLock(context.Background(), nil, id, source, Options{Timeout: time.Second}) {
			n := atomic.AddInt32(activity, 1)

	for i := 0; i < p.dataBlocks; i++ {
		// Setup read triggers for p.dataBlocks number of reads so that it reads in parallel.
		readTriggerCh <- true
	}

	disksNotFound := int32(0)
	bitrotHeal := int32(0)       // Atomic bool flag.
	missingPartsHeal := int32(0) // Atomic bool flag.
	readerIndex := 0
	var wg sync.WaitGroup
	// if readTrigger is true, it implies next disk.ReadAt() should be tried

)

// Config represents the heal settings.
type Config struct {
	// Delay is the sleep multiplier.
	Delay float64 `json:"delay"`

	// Sleep always or based on incoming S3 requests.
	IdleMode int32 // 0 => on, 1 => off

	// Alert upon this many excess object versions
	ExcessVersions int64 // 100

	// Alert upon this many excess sub-folders per folder in an erasure set.
	ExcessFolders int64 // 50000

	"794c7630": "overlayfs",
	"2fc12fc1": "zfs",
	"ff534d42": "cifs",
	"53464846": "wslfs",
}

// getFSType returns the filesystem type of the underlying mounted filesystem
func getFSType(ftype int32) string {
	fsTypeHex := strconv.FormatInt(int64(ftype), 16)
	fsTypeString, ok := fsType2StringMap[fsTypeHex]
	if !ok {
		return "UNKNOWN"
	}
	return fsTypeString
}

// buffer is full, new logs are just ignored and an error
// is returned to the caller.
type Target struct {
	totalMessages  int64
	failedMessages int64
	status         int32

	// Worker control
	workers    int64
	maxWorkers int64
	// workerStartMu sync.Mutex
	lastStarted time.Time

	wg sync.WaitGroup

	// Channel of log entries.

}

// ServerHTTPStats holds all type of http operations performed to/from the server
// including their average execution time.
type ServerHTTPStats struct {
	S3RequestsInQueue      int32              `json:"s3RequestsInQueue"`
	S3RequestsIncoming     uint64             `json:"s3RequestsIncoming"`
	CurrentS3Requests      ServerHTTPAPIStats `json:"currentS3Requests"`