import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.locks.AbstractQueuedSynchronizer;
import org.jspecify.annotations.NullUnmarked;
import org.jspecify.annotations.Nullable;

/** Utilities for the AbstractFutureBenchmarks */
@NullUnmarked
final class AbstractFutureBenchmarks {

	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 {

| `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` |

	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.
	HasIfMatch                          bool      // indicates if the request has If-Match header
	ProxyRequest                        bool      // only set for GET/HEAD in active-active replication scenario

// 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
}

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">

import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
import java.util.concurrent.locks.LockSupport;
import org.jspecify.annotations.Nullable;
import sun.misc.Unsafe;

/** Supertype of {@link AbstractFuture} that contains platform-specific functionality. */

import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
import java.util.concurrent.locks.LockSupport;
import org.jspecify.annotations.Nullable;
import sun.misc.Unsafe;

/** Supertype of {@link AbstractFuture} that contains platform-specific functionality. */

			}
			serverLocksResp, err := sys.peerClients[index].GetLocks(ctx)
			if err != nil {
				return err
			}
			locksResp[index] = &PeerLocks{
				Addr:  sys.peerClients[index].host.String(),
				Locks: serverLocksResp,
			}
			return nil
		}, index)
	}
	for index, err := range g.Wait() {
		reqInfo := (&logger.ReqInfo{}).AppendTags("peerAddress",
			sys.peerClients[index].host.String())