if (threadStarted) {
      return;
    }

    Reference<?> reference;
    while ((reference = queue.poll()) != null) {
      /*
       * This is for the benefit of phantom references. Weak and soft references will have already
       * been cleared by this point.
       */
      reference.clear();
      try {
        ((FinalizableReference) reference).finalizeReferent();
      } catch (Throwable t) {

    if (threadStarted) {
      return;
    }

    Reference<?> reference;
    while ((reference = queue.poll()) != null) {
      /*
       * This is for the benefit of phantom references. Weak and soft references will have already
       * been cleared by this point.
       */
      reference.clear();
      try {
        ((FinalizableReference) reference).finalizeReferent();
      } catch (Throwable t) {

    return warmUp(cache, WARMUP_MIN, WARMUP_MAX);
  }

  /**
   * Returns the entries that were added to the map, so they won't fall out of a map with weak or
   * soft references until the caller drops the reference to the returned entries.
   */
  private List<Entry<Object, Object>> warmUp(
      LoadingCache<Object, Object> cache, int minimum, int maximum) {

   * demand.
   *
   * <p><b>Warning:</b> in most circumstances it is better to set a per-cache {@linkplain
   * #maximumSize(long) maximum size} instead of using soft references. You should only use this
   * method if you are well familiar with the practical consequences of soft references.
   *
   * <p><b>Note:</b> when this method is used, the resulting cache will use identity ({@code ==})
   * comparison to determine equality of values.

   * demand.
   *
   * <p><b>Warning:</b> in most circumstances it is better to set a per-cache {@linkplain
   * #maximumSize(long) maximum size} instead of using soft references. You should only use this
   * method if you are well familiar with the practical consequences of soft references.
   *
   * <p><b>Note:</b> when this method is used, the resulting cache will use identity ({@code ==})
   * comparison to determine equality of values.

      if (ref != null) {
        ref.clear();
      }
    }
  }

  /**
   * Poke into the Cache internals to simulate garbage collection of the given key. This assumes
   * that the given entry is a weak or soft reference, and throws an IllegalStateException if that
   * assumption does not hold.
   */
  static <K, V> void simulateKeyReclamation(Cache<K, V> cache, K key) {
    ReferenceEntry<K, V> entry = getReferenceEntry(cache, key);

      # There are currently two types of anti-affinity:
      #    "requiredDuringSchedulingIgnoredDuringExecution"
      #    "preferredDuringSchedulingIgnoredDuringExecution"
      # which denote "hard" vs. "soft" requirements, you can define your values
      # in "podAntiAffinityLabelSelector" and "podAntiAffinityTermLabelSelector"
      # correspondingly.
      # For example:
      # podAntiAffinityLabelSelector:

      # There are currently two types of anti-affinity:
      #    "requiredDuringSchedulingIgnoredDuringExecution"
      #    "preferredDuringSchedulingIgnoredDuringExecution"
      # which denote "hard" vs. "soft" requirements, you can define your values
      # in "podAntiAffinityLabelSelector" and "podAntiAffinityTermLabelSelector"
      # correspondingly.
      # For example:
      # podAntiAffinityLabelSelector:

        # shellcheck disable=SC2039,SC3045
        MAX_FD=$( ulimit -H -n ) ||
            warn "Could not query maximum file descriptor limit"
    esac
    case $MAX_FD in  #(
      '' | soft) :;; #(
      *)
        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
        # shellcheck disable=SC2039,SC3045
        ulimit -n "$MAX_FD" ||

  // Return the ParsedName of Host CPU device.
  virtual const DeviceNameUtils::ParsedName& HostCPUParsedName() const = 0;
  virtual const string& HostCPUName() const = 0;

  // Configure soft device placement policy.
  virtual void SetAllowSoftPlacement(bool enable) = 0;

  // Configure device placement policy logging.
  virtual void SetLogDevicePlacement(bool enable) = 0;