* Returns an Unsafe. Suitable for use in a 3rd party package. Replace with a simple call to
     * Unsafe.getUnsafe when integrating into a JDK.
     *
     * @return an Unsafe instance if successful
     */
    @SuppressWarnings("removal") // b/318391980
    private static Unsafe getUnsafe() {
      try {
        return Unsafe.getUnsafe();
      } catch (SecurityException tryReflectionInstead) {
        // We'll try reflection instead.

   * Returns a sun.misc.Unsafe. Suitable for use in a 3rd party package. Replace with a simple call
   * to Unsafe.getUnsafe when integrating into a jdk.
   *
   * @return a sun.misc.Unsafe
   */
  @SuppressWarnings("removal") // b/318391980
  private static sun.misc.Unsafe getUnsafe() {
    try {
      return sun.misc.Unsafe.getUnsafe();
    } catch (SecurityException tryReflectionInstead) {
    }
    try {

   * Returns a sun.misc.Unsafe. Suitable for use in a 3rd party package. Replace with a simple call
   * to Unsafe.getUnsafe when integrating into a jdk.
   *
   * @return a sun.misc.Unsafe
   */
  @SuppressWarnings("removal") // b/318391980
  private static sun.misc.Unsafe getUnsafe() {
    try {
      return sun.misc.Unsafe.getUnsafe();
    } catch (SecurityException tryReflectionInstead) {
    }
    try {

   * Returns a sun.misc.Unsafe. Suitable for use in a 3rd party package. Replace with a simple call
   * to Unsafe.getUnsafe when integrating into a jdk.
   *
   * @return a sun.misc.Unsafe
   */
  @SuppressWarnings("removal") // b/318391980
  private static sun.misc.Unsafe getUnsafe() {
    try {
      return sun.misc.Unsafe.getUnsafe();
    } catch (SecurityException tryReflectionInstead) {
    }
    try {

    static {
      try {
        UNSAFE = getUnsafe();
        HEAD_OFFSET = UNSAFE.objectFieldOffset(ExecutionListCAS.class.getDeclaredField("head"));
      } catch (Exception ex) {
        throw new Error(ex);
      }
    }

    /** TODO(lukes): This was copied verbatim from Striped64.java... standardize this? */
    private static sun.misc.Unsafe getUnsafe() {
      try {
        return sun.misc.Unsafe.getUnsafe();

    static {
      try {
        UNSAFE = getUnsafe();
        HEAD_OFFSET = UNSAFE.objectFieldOffset(ExecutionListCAS.class.getDeclaredField("head"));
      } catch (Exception ex) {
        throw new Error(ex);
      }
    }

    /** TODO(lukes): This was copied verbatim from Striped64.java... standardize this? */
    private static sun.misc.Unsafe getUnsafe() {
      try {
        return sun.misc.Unsafe.getUnsafe();

       * call to Unsafe.getUnsafe when integrating into a jdk.
       *
       * @return a sun.misc.Unsafe
       */
      @SuppressWarnings("removal") // b/318391980
      private static sun.misc.Unsafe getUnsafe() {
        try {
          return sun.misc.Unsafe.getUnsafe();
        } catch (SecurityException e) {
          // that's okay; try reflection instead

    static final long WAITER_THREAD_OFFSET;
    static final long WAITER_NEXT_OFFSET;

    static {
      sun.misc.Unsafe unsafe = null;
      try {
        unsafe = sun.misc.Unsafe.getUnsafe();
      } catch (SecurityException tryReflectionInstead) {
        try {
          unsafe =
              AccessController.doPrivileged(
                  new PrivilegedExceptionAction<sun.misc.Unsafe>() {