debug.PrintStack()
		return metacache{}
	}

	// Grab a write lock, since we create one if we cannot find one.
	b.mu.Lock()
	defer b.mu.Unlock()

	// Check if exists already.
	if c, ok := b.caches[o.ID]; ok {
		c.lastHandout = time.Now()
		b.caches[o.ID] = c
		b.debugf("returning existing %v", o.ID)
		return c
	}

	if !o.Create {

    }
}
```

### 4.3 Lease Manager
```java
package jcifs.internal.smb2.lease;

import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import jcifs.CIFSContext;

public class LeaseManager {
    private final ConcurrentHashMap<Smb2LeaseKey, LeaseEntry> leases;

		}(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">
For any <code>sync.Mutex</code> or <code>sync.RWMutex</code> variable <code>l</code> and <i>n</i> &lt; <i>m</i>,

	}
	p.priority = pri
	p.maxWorkers = maxWorkers
	p.mu.Unlock()
	p.ResizeWorkers(workers, 0)
	p.ResizeFailedWorkers(mrfWorkers)
	p.ResizeLrgWorkers(maxLWorkers, 0)
}

// ResizeFailedWorkers sets replication failed workers pool size
func (p *ReplicationPool) ResizeFailedWorkers(n int) {
	p.mu.Lock()
	defer p.mu.Unlock()

	for p.mrfWorkerSize < n {
		p.mrfWorkerSize++

	}
	lastDriveStatsRefresh = time.Now().UTC()
	latestDriveStatsMu.Unlock()
}

// startResourceMetricsCollection - starts the job for collecting resource metrics
func startResourceMetricsCollection() {
	initLatestValues()

	resourceMetricsMapMu.Lock()
	resourceMetricsMap = map[MetricSubsystem]ResourceMetrics{}
	resourceMetricsMapMu.Unlock()
	metricsTimer := time.NewTimer(resourceMetricsCollectionInterval)

	activeConnections uint64
	sync.RWMutex
}

func (n *netPerfRX) Connect() {
	n.Lock()
	defer n.Unlock()
	n.activeConnections++
	atomic.StoreUint64(&n.RX, 0)
	n.lastToConnect = time.Now()
}

func (n *netPerfRX) Disconnect() {
	n.Lock()
	defer n.Unlock()
	n.activeConnections--
	if n.firstToDisconnect.IsZero() {
		n.RXSample = atomic.LoadUint64(&n.RX)

	Endpoint string `json:"-"`
	// Secure is true if the replication target endpoint is secure
	Secure bool `json:"-"`
}

func (sr *SRStats) update(st replStat, dID string) {
	sr.lock.Lock()
	defer sr.lock.Unlock()
	srs, ok := sr.M[dID]
	if !ok {
		srs = &SRStatus{
			XferRateLrg: newXferStats(),
			XferRateSml: newXferStats(),
		}
	}
	srs.Endpoint = st.Endpoint
	srs.Secure = st.Secure
	switch {

		binary.LittleEndian.PutUint16(data[2:4], version)

		buf, err := ri.MarshalMsg(data)
		ri.mu.Unlock()
		if err != nil {
			return err
		}
		path, err := ri.getJobReportPath()
		if err != nil {
			batchLogIf(ctx, err)
			return err
		}
		return saveConfig(ctx, api, path, buf)
	}
	ri.mu.Unlock()
	return nil
}

// Note: to be used only with batch jobs that affect multiple versions through

	globalObjLayerMutex.Lock()
	globalConsoleSrv = srv
	globalObjLayerMutex.Unlock()
}

func newObjectLayerFn() ObjectLayer {
	globalObjLayerMutex.RLock()
	defer globalObjLayerMutex.RUnlock()
	return globalObjectAPI
}

func setObjectLayer(o ObjectLayer) {
	globalObjLayerMutex.Lock()
	globalObjectAPI = o
	globalObjLayerMutex.Unlock()
}

// objectAPIHandlers implements and provides http handlers for S3 API.

	}
	atomic.AddInt64(&sys.totalMessages, 1)

	sys.pubsub.Publish(lg)
	sys.Lock()
	// add log to ring buffer
	sys.logBuf.Value = lg
	sys.logBuf = sys.logBuf.Next()
	sys.Unlock()
	err := sys.console.Send(entry)
	if err != nil {
		atomic.AddInt64(&sys.failedMessages, 1)
	}
	return err