// first time for this instance of [Once]. In other words, given
//
//	var once Once
//
// if once.Do(f) is called multiple times, only the first call will invoke f,
// even if f has a different value in each invocation. A new instance of
// Once is required for each function to execute.
//
// Do is intended for initialization that must be run exactly once. Since f

}

func ExampleOnce() {
	var once sync.Once
	onceBody := func() {
		fmt.Println("Only once")
	}
	done := make(chan bool)
	for i := 0; i < 10; i++ {
		go func() {
			once.Do(onceBody)
			done <- true
		}()
	}
	for i := 0; i < 10; i++ {
		<-done
	}
	// Output:
	// Only once
}

// This example uses OnceValue to perform an "expensive" computation just once,
// even when used concurrently.

	w := httptest.NewRecorder()
	wrapped.ServeHTTP(w, testRequest)

	if handlerCallCount != 1 {
		t.Errorf("expected the given handler to be invoked once, but was actually invoked %d times", handlerCallCount)
	}
	if actionCallCount != 1 {
		t.Errorf("expected the action callback to be invoked once, but was actually invoked %d times", actionCallCount)
	}
	if filterRecordGot == nil {

 */
@ServiceScope(Scope.Global.class)
public interface GradleModuleServices extends ServiceRegistrationProvider {
    /**
     * Called once per process, to register any globally scoped services. These services are reused across builds in the same process.
     * The services are closed when the process finishes.
     *

//
// 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()
	return systemRoots
}

func initSystemRoots() {

	case isClosedChan(p.writeDeadline.wait()):
		return 0, os.ErrDeadlineExceeded
	}

	p.wrMu.Lock() // Ensure entirety of b is written together
	defer p.wrMu.Unlock()
	for once := true; once || len(b) > 0; once = false {
		select {
		case p.wrTx <- b:
			nw := <-p.wrRx
			b = b[nw:]
			n += nw
		case <-p.localDone:
			return n, io.ErrClosedPipe
		case <-p.remoteDone:

	// The returned value can no longer be modified once returned.
	// Should be set before calling Get().
	updateFn func(ctx context.Context) (T, error)

	// ttl for a cached value.
	ttl time.Duration

	opts Opts

	// Once can be used to initialize values for lazy initialization.
	// Should be set before calling Get().
	Once sync.Once

	// Managed values.
	val          atomic.Pointer[T]

        when:
        registry.get("id", TestDeploymentHandle)
        then:
        def e = thrown(IllegalStateException)
        e.message == "Cannot modify deployment handles once the registry has been stopped."
    }

    def "cannot register a handle once the registry is stopped" () {
        given:
        registry.stop()

        when:
        registry.start("id", DeploymentRegistry.ChangeBehavior.NONE, TestDeploymentHandle)

	".pdf":  "application/pdf",
	".png":  "image/png",
	".svg":  "image/svg+xml",
	".wasm": "application/wasm",
	".webp": "image/webp",
	".xml":  "text/xml; charset=utf-8",
}

var once sync.Once // guards initMime

var testInitMime, osInitMime func()

func initMime() {
	if fn := testInitMime; fn != nil {
		fn()
	} else {
		setMimeTypes(builtinTypesLower, builtinTypesLower)
		osInitMime()
	}

	configurationName string

	initObjectSelector sync.Once
	objectSelector     labels.Selector
	objectSelectorErr  error

	initNamespaceSelector sync.Once
	namespaceSelector     labels.Selector
	namespaceSelectorErr  error

	initClient sync.Once
	client     *rest.RESTClient
	clientErr  error

	compileMatcher  sync.Once
	compiledMatcher matchconditions.Matcher
}