if w.waiting == w.running {
				// All done.
				w.wait.Broadcast()
				w.mu.Unlock()
				return
			}
			w.wait.Wait()
			w.waiting--
		}

		// Pick something to do at random,
		// to eliminate pathological contention
		// in case items added at about the same time
		// are most likely to contend.
		i := rand.Intn(len(w.todo))
		item := w.todo[i]
		w.todo[i] = w.todo[len(w.todo)-1]
		w.todo = w.todo[:len(w.todo)-1]

	// DesiredStateOfWorldPopulatorLoopSleepPeriod is the amount of time the
	// DesiredStateOfWorldPopulator loop waits between successive executions
	DesiredStateOfWorldPopulatorLoopSleepPeriod time.Duration

	// DesiredStateOfWorldPopulatorListPodsRetryDuration is the amount of
	// time the DesiredStateOfWorldPopulator loop waits between list pods
	// calls.
	DesiredStateOfWorldPopulatorListPodsRetryDuration time.Duration
}

	bgwork <- func() {
		defer wg.Done()
		run(dir, CheckExit|ShowOutput|Background, cmd...)
	}
}

// bgwait waits for pending bgruns to finish.
// bgwait must be called from only a single goroutine at a time.
func bgwait(wg *sync.WaitGroup) {
	done := make(chan struct{})
	go func() {
		wg.Wait()
		close(done)
	}()
	select {
	case <-done:
	case <-dying:

		require.ErrorIs(t, stopReason, context.Canceled)
	}()

	// Wait for controller and informer to start up
	require.True(t, cache.WaitForCacheSync(testContext.Done(), myController.HasSynced))

	// Stop the controller and informer
	testCancel()

	// Wait for controller and informer to stop
	wg.Wait()

	// Ensure the event handler was cleaned up
	require.Empty(t, informer.registrations)

	var wg sync.WaitGroup
	wg.Add(1)
	defer wg.Wait()
	go func() {
		defer wg.Done()

		_, err := io.Copy(stdin, strings.NewReader(stdinCloseTestString))
		check("Copy", err)

		// Before the fix, this next line would race with cmd.Wait.
		if err := stdin.Close(); err != nil && !errors.Is(err, os.ErrClosed) {
			t.Errorf("Close: %v", err)
		}
	}()

	check("Wait", cmd.Wait())
}

// Issue 17647.

		if waiting {
			<-doneCh
		} else {
			cmd.Wait()
		}
	})

	// Wait for After1 to close its stdout so that we know the runtime's SIGIO
	// handler is registered.
	b, err := io.ReadAll(stdout)
	if len(b) > 0 {
		t.Logf("read from testprog stdout: %s", b)
	}
	if err != nil {
		t.Fatalf("error reading from testprog: %v", err)
	}

	// Wait for child exit.
	//

	// registration/deregistration
	AddHandler(pluginType string, pluginHandler cache.PluginHandler)
}

const (
	// loopSleepDuration is the amount of time the reconciler loop waits
	// between successive executions
	loopSleepDuration = 1 * time.Second
)

// NewPluginManager returns a new concrete instance implementing the
// PluginManager interface.
func NewPluginManager(
	sockDir string,

	Err    error
	Shared bool
}

// Do executes and returns the results of the given function, making
// sure that only one execution is in-flight for a given key at a
// time. If a duplicate comes in, the duplicate caller waits for the
// original to complete and receives the same results.
// The return value shared indicates whether v was given to multiple callers.
func (g *Group) Do(key string, fn func() (any, error)) (v any, err error, shared bool) {

	Update
)

func (a ACTION) String() string {
	switch a {
	case Add:
		return "Add"
	case Update:
		return "Update"
	}
	return "Unknown"
}

// Run starts the cluster's informers and waits for caches to sync. Once caches are synced, we mark the cluster synced.
// This should be called after each of the handlers have registered informers, and should be run in a goroutine.

var CleanupConditionally Option = OptionFunc(func(opts *Options) {
	opts.Cleanup = cleanup.Conditionally
})

// Wait configures the Options to wait for configuration to propagate.
// This method currently does nothing, due to https://github.com/istio/istio/issues/37148
var Wait Option = OptionFunc(func(opts *Options) {
	// opts.Wait = true