toEntry := func(lri lockRequesterInfo) string {
		return fmt.Sprintf("%s/%s", lri.Name, lri.UID)
	}
	for _, peerLock := range peerLocks {
		if peerLock == nil {
			continue
		}
		for k, v := range peerLock.Locks {
			for _, lockReqInfo := range v {
				if val, ok := entryMap[toEntry(lockReqInfo)]; ok {
					val.ServerList = append(val.ServerList, peerLock.Addr)
				} else {

type Manager struct {
	// ID is an instance ID, that will change whenever the server restarts.
	// This allows remotes to keep track of whether state is preserved.
	ID uuid.UUID

	// Immutable after creation, so no locks.
	targets map[string]*Connection

	// serverside handlers.
	handlers handlers

	// local host name.
	local string

	// authToken is a function that will validate a token.
	authToken ValidateTokenFn

| `minio_system_process_locks_read_total`            | Number of current READ locks on this peer. <br><br>Type: gauge                                                                        | `server` |
| `minio_system_process_locks_write_total`           | Number of current WRITE locks on this peer. <br><br>Type: gauge                                                                       | `server` |

				Namespace: minioNamespace,
				Subsystem: "locks",
				Name:      "total",
				Help:      "Number of current locks on this peer",
				Type:      gaugeMetric,
			},
			Value: float64(st.Total),
		})
		metrics = append(metrics, MetricV2{
			Description: MetricDescription{
				Namespace: minioNamespace,
				Subsystem: "locks",
				Name:      "write_total",

import okhttp3.Protocol
import okhttp3.Request
import okhttp3.Route
import okhttp3.internal.closeQuietly
import okhttp3.internal.concurrent.TaskRunner
import okhttp3.internal.connection.Locks.withLock
import okhttp3.internal.connection.RoutePlanner.ConnectResult
import okhttp3.internal.http.ExchangeCodec
import okhttp3.internal.http1.Http1ExchangeCodec
import okhttp3.internal.platform.Platform

        this.runnable = runnable;
        this.executor = executor;
      }
    }
  }

  // A version of the list that uses compare and swap to manage the stack without locks.
  @SuppressWarnings({"SunApi", "removal"}) // b/345822163
  private static final class ExecutionListCAS {
    static final Logger log = Logger.getLogger(ExecutionListCAS.class.getName());

// name tierName, otherwise returns madmin.Unsupported and false. N B this
// function is meant for internal use, where the caller is expected to take
// appropriate locks.
func (config *TierConfigMgr) isTierNameInUse(tierName string) (madmin.TierType, bool) {
	if t, ok := config.Tiers[tierName]; ok {
		return t.Type, true
	}
	return madmin.Unsupported, false
}

	promMetrics := metricValues.ToPromMetrics(mg.CollectorPath.metricPrefix(),
		mg.ExtraLabels)
	for _, metric := range promMetrics {
		ch <- metric
	}
}

// LockAndSetBuckets - locks the buckets and sets the given buckets. It returns
// a function to unlock the buckets.
func (mg *MetricsGroup) LockAndSetBuckets(buckets []string) func() {
	mg.bucketsLock.Lock()
	mg.buckets = buckets
	return func() {

	PreserveETag                        string    // preserves this etag during a PUT call.
	NoLock                              bool      // indicates to lower layers if the caller is expecting to hold locks.
	ProxyRequest                        bool      // only set for GET/HEAD in active-active replication scenario
	ProxyHeaderSet                      bool      // only set for GET/HEAD in active-active replication scenario

var limit = make(chan int, 3)

func main() {
	for _, w := range work {
		go func(w func()) {
			limit <- 1
			w()
			<-limit
		}(w)
	}
	select{}
}
</pre>

<h3 id="locks">Locks</h3>

<p>
The <code>sync</code> package implements two lock data types,
<code>sync.Mutex</code> and <code>sync.RWMutex</code>.
</p>

<p class="rule">