<p class="rule">
The completion of a single call of <code>f()</code> from <code>once.Do(f)</code>
is synchronized before the return of any call of <code>once.Do(f)</code>.
</p>

<p>
In this program:
</p>

<pre>
var a string
var once sync.Once

func setup() {
	a = "hello, world"
}

func doprint() {
	once.Do(setup)
	print(a)
}

func twoprint() {
	go doprint()

 * <li>The client sends a {@link Finished} message once it has received the {@link Result} message.
 *     It may no longer send any messages.</li>
 * <li>The client closes the connection.</li>
 * <li>The daemon closes the connection once it has received the {@link Finished} message.</li>
 * </ul>
 *
 * <p>To stop a daemon:</p>
 *
 * <ul>

	// TODO: We might wanna make this a substruct like Debugging componentbaseconfig.DebuggingConfiguration
	componentbaseconfig.DebuggingConfiguration

	// PercentageOfNodesToScore is the percentage of all nodes that once found feasible
	// for running a pod, the scheduler stops its search for more feasible nodes in
	// the cluster. This helps improve scheduler's performance. Scheduler always tries to find

Help tasks
----------
buildEnvironment - Displays all buildscript dependencies declared in root project 'myTutorial'.
...
----

Tasks either come from *build scripts* or *plugins*.

Once we apply a plugin to our project, such as the `application` plugin, additional tasks become available:

.build.gradle.kts
[source,kotlin]
plugins {
    id("application")
}

[source]
----
$ ./gradlew tasks

// (such as a live GET from the API server) prior to the first adoption.
// It will only be called (at most once) if an adoption is actually attempted.
// If CanAdopt() returns a non-nil error, all adoptions will fail.
//
// NOTE: Once CanAdopt() is called, it will not be called again by the same
// PodControllerRefManager instance. Create a new instance if it makes

  }

  public void testExecutorOnlyCalledOnce() throws Exception {
    TestService service = new TestService();
    service.startAsync().awaitRunning();
    // It should be called once during startup.
    assertEquals(1, service.numberOfTimesExecutorCalled.get());
    for (int i = 1; i < 10; i++) {
      service.runFirstBarrier.await();
      assertEquals(i, service.numberOfTimesRunCalled.get());

  }

  public void testExecutorOnlyCalledOnce() throws Exception {
    TestService service = new TestService();
    service.startAsync().awaitRunning();
    // It should be called once during startup.
    assertEquals(1, service.numberOfTimesExecutorCalled.get());
    for (int i = 1; i < 10; i++) {
      service.runFirstBarrier.await();
      assertEquals(i, service.numberOfTimesRunCalled.get());

    // TODO: Use @RequiresInstalledToolChain instead once Xcode test are sorted out
    void assumeSwiftCompilerVersion(SwiftVersion swiftVersion) {
        assert toolChain != null, "You need to specify Swift tool chain requirement with 'requireSwiftToolChain()'"
        assumeTrue(toolChain.version.major == swiftVersion.version)
    }

    // TODO: Use @RequiresInstalledToolChain instead once Xcode test are sorted out

func (c *Repair) RunUntil(onFirstSuccess func(), stopCh chan struct{}) {
	c.broadcaster.StartRecordingToSink(stopCh)
	defer c.broadcaster.Shutdown()

	var once sync.Once
	wait.Until(func() {
		if err := c.runOnce(); err != nil {
			runtime.HandleError(err)
			return
		}
		once.Do(onFirstSuccess)
	}, c.interval, stopCh)
}

// runOnce verifies the state of the port allocations and returns an error if an unrecoverable problem occurs.

type lazyObject struct {
	parent  *Scope
	resolve func() Object
	obj     Object
	once    sync.Once
}

// resolve returns the Object represented by obj, resolving lazy
// objects as appropriate.
func resolve(name string, obj Object) Object {
	if lazy, ok := obj.(*lazyObject); ok {
		lazy.once.Do(func() {
			obj := lazy.resolve()

			if _, ok := obj.(*lazyObject); ok {