// alloc on every call, so we have a clean entry to swap in.
	t := time.Now().Unix()
	e.init.Do(func() {
		e.cached.Store(&AccElem{})
		atomic.StoreInt64(&e.cachedSec, t)
	})
	acc := e.cached.Load()
	if lastT := atomic.LoadInt64(&e.cachedSec); lastT != t {
		// Check if lastT was changed by someone else.
		if atomic.CompareAndSwapInt64(&e.cachedSec, lastT, t) {
			// Now we swap in a new.
			newAcc := &AccElem{}

				epHealth.offlineDuration = prev.offlineDuration
				epHealth.lastHCAt = prev.lastHCAt
				epHealth.latency = prev.latency
			}
			m[t.Endpoint] = epHealth
		}
	}
	// swap out the map
	sys.hc = m
	sys.hMutex.Unlock()
}

func (sys *BucketTargetSys) healthStats() map[string]epHealth {
	sys.hMutex.RLock()
	defer sys.hMutex.RUnlock()
	m := make(map[string]epHealth, len(sys.hc))

	globalServiceFreezeMu.Lock()
	// Close when we reach 0
	globalServiceFreezeCnt--
	if globalServiceFreezeCnt <= 0 {
		// Set to a nil channel.
		var _ch chan struct{}
		if val := globalServiceFreeze.Swap(_ch); val != nil {
			if ch, ok := val.(chan struct{}); ok && ch != nil {
				// Close previous non-nil channel.
				xioutil.SafeClose(ch)
			}
		}
		globalServiceFreezeCnt = 0 // Don't risk going negative.
	}

func uniq(data sort.Interface) (size int) {
	p, l := 0, data.Len()
	if l <= 1 {
		return l
	}
	for i := 1; i < l; i++ {
		if !data.Less(p, i) {
			continue
		}
		p++
		if p < i {
			data.Swap(p, i)
		}
	}
	return p + 1
}

// Remove any duplicates and return unique entries.
func uniqueEntries(paths []string) []string {
	sort.Strings(paths)
	n := uniq(sort.StringSlice(paths))