* method equivalent to {@link
 * java.util.concurrent.locks.ReentrantLock#hasWaiters(java.util.concurrent.locks.Condition)},
 * except that the method parameter must accept whatever condition-like object is passed into {@code
 * callAndAssertWaits} by the test.
 *
 * @param <L> the type of the lock-like object to be used
 * @author Justin T. Sampson
 */

 * method equivalent to {@link
 * java.util.concurrent.locks.ReentrantLock#hasWaiters(java.util.concurrent.locks.Condition)},
 * except that the method parameter must accept whatever condition-like object is passed into {@code
 * callAndAssertWaits} by the test.
 *
 * @param <L> the type of the lock-like object to be used
 * @author Justin T. Sampson
 */

func (p *PriorityQueue) Close() {
	p.lock.Lock()
	defer p.lock.Unlock()
	close(p.stop)
	p.closed = true
	p.cond.Broadcast()
}

// DeleteNominatedPodIfExists deletes <pod> from nominatedPods.
func (npm *nominator) DeleteNominatedPodIfExists(pod *v1.Pod) {
	npm.lock.Lock()
	npm.deleteNominatedPodIfExistsUnlocked(pod)
	npm.lock.Unlock()
}

    override fun scopeFor(classLoader: ClassLoader?): Pair<ClassLoaderScopeSpec, ClassLoaderRole>? {
        synchronized(lock) {
            return loaders[classLoader]
        }
    }

    override fun childScopeCreated(parentId: ClassLoaderScopeId, childId: ClassLoaderScopeId, origin: ClassLoaderScopeOrigin?) {
        synchronized(lock) {
            if (scopeSpecs.containsKey(childId)) {
                // scope is being reused

        then:
        outputContains("bar")
        configurationCache.assertStateLoaded()

        where:
        commandLine              | _
        "--refresh-dependencies" | _
        "--write-locks"          | _
        "--update-locks thing:*" | _
    }

                @TaskAction
                void lockIt() {
                    def lock
                    try {
                        lock = fileLockManager.lock(projectLayout.projectDirectory.file("locks/testlock").asFile, DefaultLockOptions.mode(FileLockManager.LockMode.Exclusive), "task file lock")
                    } finally {
                        lock?.close()
                    }
                }
            }

}

func (e *EndpointIndex) DeleteServiceShard(shard ShardKey, serviceName, namespace string, preserveKeys bool) {
	e.mu.Lock()
	defer e.mu.Unlock()
	e.deleteServiceInner(shard, serviceName, namespace, preserveKeys)
}

func (e *EndpointIndex) DeleteShard(shardKey ShardKey) {
	e.mu.Lock()
	defer e.mu.Unlock()
	for svc, shardsByNamespace := range e.shardsBySvc {
		for ns := range shardsByNamespace {

		wcEvent.PrevObjFields = previousElem.Fields
	}

	if err := func() error {
		w.Lock()
		defer w.Unlock()

		w.updateCache(wcEvent)
		w.resourceVersion = resourceVersion
		defer w.cond.Broadcast()

		return updateFunc(elem)
	}(); err != nil {
		return err
	}

	// Avoid calling event handler under lock.
	// This is safe as long as there is at most one call to Add/Update/Delete and

}

func (c *Cacher) startCaching(stopChannel <-chan struct{}) {
	// The 'usable' lock is always 'RLock'able when it is safe to use the cache.
	// It is safe to use the cache after a successful list until a disconnection.
	// We start with usable (write) locked. The below OnReplace function will
	// unlock it after a successful list. The below defer will then re-lock
	// it when this function exits (always due to disconnection), only if

    private Try<T> instantiate() {
        // TODO - extract some shared infrastructure to take care of instantiation (eg which services are visible, strict vs lenient, decorated or not?)
        // TODO - should hold the project lock to do the isolation. Should work the same way as artifact transforms (a work node does the isolation, etc)
        P isolatedParameters = isolatableFactory.isolate(getParameters()).isolate();
        // TODO - reuse this in other places