ServiceManager manager = new ServiceManager(asList(a, b));
    RecordingListener listener = new RecordingListener();
    manager.addListener(listener, directExecutor());
    assertState(manager, Service.State.NEW, a, b);
    assertFalse(manager.isHealthy());
    manager.startAsync().awaitHealthy();
    assertState(manager, Service.State.RUNNING, a, b);
    assertTrue(manager.isHealthy());

    ServiceManager manager = new ServiceManager(asList(a, b));
    RecordingListener listener = new RecordingListener();
    manager.addListener(listener, directExecutor());
    assertState(manager, Service.State.NEW, a, b);
    assertFalse(manager.isHealthy());
    manager.startAsync().awaitHealthy();
    assertState(manager, Service.State.RUNNING, a, b);
    assertTrue(manager.isHealthy());

 *
 * <pre>{@code
 * class Server {
 *   public static void main(String[] args) {
 *     Set<Service> services = ...;
 *     ServiceManager manager = new ServiceManager(services);
 *     manager.addListener(new Listener() {
 *         public void stopped() {}
 *         public void healthy() {
 *           // Services have been initialized and are healthy, start accepting requests...

  /**
   * Runs Runnable r with a security policy that permits precisely the specified permissions. If
   * there is no current security manager, the runnable is run twice, both with and without a
   * security manager. We require that any security manager permit getPolicy/setPolicy.
   */
  public void runWithPermissions(Runnable r, Permission... permissions) {
    SecurityManager sm = System.getSecurityManager();

  /**
   * Runs Runnable r with a security policy that permits precisely the specified permissions. If
   * there is no current security manager, the runnable is run twice, both with and without a
   * security manager. We require that any security manager permit getPolicy/setPolicy.
   */
  public void runWithPermissions(Runnable r, Permission... permissions) {
    SecurityManager sm = System.getSecurityManager();

        <!--
            In order to build and run the tests against JDK 18+, we need to pass java.security.manager=allow, to make
            the deprecated 'java.lang.SecurityManager' available for use.
         -->
        <jdk>[18,]</jdk>
      </activation>
      <properties>
        <test.add.args>-Djava.security.manager=allow</test.add.args>
      </properties>
    </profile>
  </profiles>

      return false;
    }
  }

  /**
   * Creates a thread using {@link #platformThreadFactory}, and sets its name to {@code name} unless
   * changing the name is forbidden by the security manager.
   */
  @J2ktIncompatible
  @GwtIncompatible // concurrency
  static Thread newThread(String name, Runnable runnable) {
    checkNotNull(name);
    checkNotNull(runnable);

      RunnableExecutorPair(Runnable runnable, Executor executor) {
        this.runnable = runnable;
        this.executor = executor;
      }
    }
  }

  // A version of the list that uses compare and swap to manage the stack without locks.
  private static final class ExecutionListCAS {
    static final Logger log = Logger.getLogger(ExecutionListCAS.class.getName());

    private static final sun.misc.Unsafe UNSAFE;

    return (timeoutNanos <= 0L) ? 0L : timeoutNanos - (System.nanoTime() - startTime);
  }

  /**
   * Signals some other thread waiting on a satisfied guard, if one exists.
   *
   * <p>We manage calls to this method carefully, to signal only when necessary, but never losing a
   * signal, which is the classic problem of this kind of concurrency construct. We must signal if

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