if m.cancelFn != nil {
			m.cancelFn(context.Canceled)
		}
		// Wait for senders to release.
		m.respMu.Lock()
	}

	defer m.respMu.Unlock()
	m.closeLocked()
}

func (m *muxClient) closeLocked() {
	if m.closed {
		return
	}
	// We hold the lock, so nobody can modify m.respWait while we're closing.
	if m.respWait != nil {
		xioutil.SafeClose(m.respWait)
		m.respWait = nil
	}

import (
	"io"
	"os"

	"github.com/minio/minio/internal/lock"
)

// AppendFile - appends the file "src" to the file "dst"
func AppendFile(dst string, src string, osync bool) error {
	appendFile, err := lock.Open(dst, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0o666)
	if err != nil {
		return err
	}
	defer appendFile.Close()

	srcFile, err := lock.Open(src, os.O_RDONLY, 0o666)
	if err != nil {
		return err
	}

func (sys *BucketTargetSys) markOffline(ep *url.URL) {
	sys.hMutex.Lock()
	defer sys.hMutex.Unlock()
	if h, ok := sys.hc[ep.Host]; ok {
		h.Online = false
		sys.hc[ep.Host] = h
	}
}

func (sys *BucketTargetSys) initHC(ep *url.URL) {
	sys.hMutex.Lock()
	sys.hc[ep.Host] = epHealth{
		Endpoint: ep.Host,
		Scheme:   ep.Scheme,
		Online:   true,
	}

}

func (t *tierMetrics) logSuccess(tier string) {
	t.Lock()
	defer t.Unlock()

	stat := t.requestsCount[tier]
	stat.success++
	t.requestsCount[tier] = stat
}

func (t *tierMetrics) logFailure(tier string) {
	t.Lock()
	defer t.Unlock()

	stat := t.requestsCount[tier]
	stat.failure++
	t.requestsCount[tier] = stat
}

		}
		sfx += v
	}

	return string(name) + "_" + sfx
}

func updateResourceMetrics(subSys MetricSubsystem, name MetricName, val float64, labels map[string]string, isCumulative bool) {
	resourceMetricsMapMu.Lock()
	defer resourceMetricsMapMu.Unlock()
	subsysMetrics, found := resourceMetricsMap[subSys]
	if !found {
		subsysMetrics = ResourceMetrics{}
	}

	key := getResourceKey(name, labels)

}

func setHTTPServer(h *xhttp.Server) {
	globalObjLayerMutex.Lock()
	globalHTTPServer = h
	globalObjLayerMutex.Unlock()
}

func newConsoleServerFn() *consoleapi.Server {
	globalObjLayerMutex.RLock()
	defer globalObjLayerMutex.RUnlock()
	return globalConsoleSrv
}

func setConsoleSrv(srv *consoleapi.Server) {
	globalObjLayerMutex.Lock()
	globalConsoleSrv = srv
	globalObjLayerMutex.Unlock()
}

		return err
	}

	// if no update is needed return right away.
	if !update {
		z.poolMetaMutex.Lock()
		z.poolMeta = meta
		z.poolMetaMutex.Unlock()
	} else {
		newMeta := newPoolMeta(z, meta)
		if err = newMeta.save(ctx, z.serverPools); err != nil {
			return err
		}
		z.poolMetaMutex.Lock()
		z.poolMeta = newMeta
		z.poolMetaMutex.Unlock()
	}

	pools := meta.returnResumablePools()

	if err != nil {
		return err
	}

	bootstrapTraceMsg("lookup the configuration")

	// Override any values from ENVs.
	lookupConfigs(srvCfg, objAPI)

	// hold the mutex lock before a new config is assigned.
	globalServerConfigMu.Lock()
	globalServerConfig = srvCfg
	globalServerConfigMu.Unlock()

	return nil

	r  io.Reader
	mu sync.Mutex
}

func (d *disconnectReader) Read(p []byte) (n int, err error) {
	d.mu.Lock()
	defer d.mu.Unlock()
	if d.r != nil {
		return d.r.Read(p)
	}
	return 0, errors.New("reader closed")
}

func (d *disconnectReader) Close() error {
	d.mu.Lock()
	d.r = nil
	d.mu.Unlock()
	return nil
}

package dsync

// Dsync represents dsync client object which is initialized with
// authenticated clients, used to initiate lock REST calls.
type Dsync struct {
	// List of rest client objects, one per lock server.
	GetLockers func() ([]NetLocker, string)

	// Timeouts to apply.
	Timeouts Timeouts