return features.EnableEnvoyFilterMetrics
		}),
	)
)

var (
	envoyFilterStatusMap = map[string]map[string]bool{} // Map of Envoy filter name, patch and status.
	envoyFilterMutex     sync.RWMutex
)

// IncrementEnvoyFilterMetric increments filter metric.
func IncrementEnvoyFilterMetric(name string, pt PatchType, applied bool) {
	if !features.EnableEnvoyFilterMetrics {
		return
	}
	envoyFilterMutex.Lock()

	"testing"
	"time"

	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/util/wait"
)

func TestTolerateBootstrapFailure(t *testing.T) {
	var fakeGetSucceed bool
	var fakeGetSucceedLock sync.RWMutex
	fakeGetFn := func() (runtime.Object, error) {
		fakeGetSucceedLock.RLock()
		defer fakeGetSucceedLock.RUnlock()
		if fakeGetSucceed {
			return nil, nil
		} else {

	"sync"
	"time"

	"istio.io/istio/pkg/cache"
)

type cacheDB struct {
	// updatedNodes that have will be flushed to disk
	updatedNodes byteCache
	// updatedMux is a lock for updatedNodes
	updatedMux sync.RWMutex
}

// byteCache implements a modified ExpiringCache interface, returning byte arrays
// for ease of integration with smt calls.
type byteCache struct {
	cache cache.ExpiringCache
}

var (
	// Guard the forking variable.
	forkingLock sync.Mutex
	// Number of goroutines currently forking, and thus the
	// number of goroutines holding a conceptual write lock
	// on ForkLock.
	forking int
)

// hasWaitingReaders reports whether any goroutine is waiting
// to acquire a read lock on rw. It is defined in the sync package.
func hasWaitingReaders(rw *sync.RWMutex) bool

// acquireForkLock acquires a write lock on ForkLock.

}

// unixStat keeps a statistic how many requests were dropped within
// a single second.
type unixStat struct {
	unixTime int64
	requests int64
}

type droppedRequestsStats struct {
	lock sync.RWMutex

	// history stores the history of dropped requests.
	history []unixStat

	// To reduce lock-contention, we store the information about
	// the current second here, which we can then access under
	// reader lock.

	go f4()
	x = 2
	<-ch
}

// A nil pointer in a mutex method call should not
// corrupt the race detector state.
// Used to hang indefinitely.
func TestNoRaceNilMutexCrash(t *testing.T) {
	var mutex sync.Mutex
	panics := 0
	defer func() {
		if x := recover(); x != nil {
			mutex.Lock()
			panics++
			mutex.Unlock()
		} else {
			panic("no panic")
		}
	}()

//   - github.com/breml/rootcerts
//
// Do not remove or change the type signature.
// See go.dev/issue/67401.
//
//go:linkname systemRoots
var (
	once           sync.Once
	systemRootsMu  sync.RWMutex
	systemRoots    *CertPool
	systemRootsErr error
	fallbacksSet   bool
)

func systemRootsPool() *CertPool {
	once.Do(initSystemRoots)
	systemRootsMu.RLock()
	defer systemRootsMu.RUnlock()

		sourcesReadyFn: sourcesReadyFn,
	}
}

// sourcesImpl implements SourcesReady.  It is thread-safe.
type sourcesImpl struct {
	// lock protects access to sources seen.
	lock sync.RWMutex
	// set of sources seen.
	sourcesSeen sets.Set[string]
	// sourcesReady is a function that evaluates if the sources are ready.
	sourcesReadyFn SourcesReadyFn
}

*/

package generic

import (
	"sync"

	"k8s.io/apimachinery/pkg/runtime/schema"
	quota "k8s.io/apiserver/pkg/quota/v1"
)

// implements a basic registry
type simpleRegistry struct {
	lock sync.RWMutex
	// evaluators tracked by the registry
	evaluators map[schema.GroupResource]quota.Evaluator
}

// NewRegistry creates a simple registry with initial list of evaluators

type Config struct {
	// Flag indicating whether callhome is enabled.
	Enable bool `json:"enable"`

	// The interval between callhome cycles
	Frequency time.Duration `json:"frequency"`
}

var configLock sync.RWMutex

// Enabled - indicates if callhome is enabled or not
func (c *Config) Enabled() bool {
	configLock.RLock()
	defer configLock.RUnlock()

	return c.Enable
}