EvProcStart   // start of P [timestamp, P ID, P seq]
	EvProcStop    // stop of P [timestamp]
	EvProcSteal   // P was stolen [timestamp, P ID, P seq, M ID]
	EvProcStatus  // P status at the start of a generation [timestamp, P ID, status]

	// Goroutines.
	EvGoCreate            // goroutine creation [timestamp, new goroutine ID, new stack ID, stack ID]

	if programmed {
		conditions = append(conditions, metav1.Condition{
			Type:   string(gateway.GatewayConditionProgrammed),
			Status: kstatus.StatusTrue,
		})
	} else {
		conditions = append(conditions, metav1.Condition{
			Type:   string(gateway.GatewayConditionProgrammed),
			Status: kstatus.StatusFalse,
		})
	}
	className := "other"
	if isWaypoint {
		className = constants.WaypointGatewayClassName
	}

	ev   Event
	proc *proc
}

type gStatus int

type gState struct {
	seq    uint64
	status gStatus
}

const (
	gDead gStatus = iota
	gRunnable
	gRunning
	gWaiting

	unordered = ^uint64(0)
	garbage   = ^uint64(0) - 1
	noseq     = ^uint64(0)
	seqinc    = ^uint64(0) - 1
)

// stateTransition returns goroutine state (sequence and status) when the event

	obj.Status.(*kstatus.WrappedStatus).Mutate(func(s config.Status) config.Status {
		gs := s.(*k8s.GatewayStatus)
		for index >= len(gs.Listeners) {
			gs.Listeners = append(gs.Listeners, k8s.ListenerStatus{})
		}
		status := gs.Listeners[index]
		status.AttachedRoutes = i
		gs.Listeners[index] = status
		return gs
	})
}

func (pl *PodTopologySpread) PreFilter(ctx context.Context, cycleState *framework.CycleState, pod *v1.Pod) (*framework.PreFilterResult, *framework.Status) {
	s, err := pl.calPreFilterState(ctx, pod)
	if err != nil {
		return nil, framework.AsStatus(err)
	} else if s != nil && len(s.Constraints) == 0 {
		return nil, framework.NewStatus(framework.Skip)
	}

	cycleState.Write(preFilterStateKey, s)

	nodeInfo, err := pl.handle.SnapshotSharedLister().NodeInfos().Get(nodeName)
	if err != nil {
		return 0, framework.AsStatus(fmt.Errorf("getting node %q from Snapshot: %w", nodeName, err))
	}

	nodeInfos, err := pl.handle.SnapshotSharedLister().NodeInfos().List()
	if err != nil {
		return 0, framework.AsStatus(err)
	}
	totalNumNodes := len(nodeInfos)

		case gvk.GatewayClass:
			c.Status = kstatus.Wrap(&k8s.GatewayClassStatus{})
		case gvk.KubernetesGateway:
			c.Status = kstatus.Wrap(&k8s.GatewayStatus{})
		case gvk.HTTPRoute:
			c.Status = kstatus.Wrap(&k8s.HTTPRouteStatus{})
		case gvk.GRPCRoute:
			c.Status = kstatus.Wrap(&k8s.GRPCRouteStatus{})
		case gvk.TCPRoute:
			c.Status = kstatus.Wrap(&k8salpha.TCPRouteStatus{})
		case gvk.TLSRoute:

		}
		status := convertContainerStatus(cStatus, oldStatusPtr)
		if utilfeature.DefaultFeatureGate.Enabled(features.InPlacePodVerticalScaling) {
			if status.State.Running != nil {
				status.Resources = convertContainerStatusResources(cName, status, cStatus, oldStatuses)
			}
		}
		if utilfeature.DefaultFeatureGate.Enabled(features.SupplementalGroupsPolicy) {
			status.User = convertContainerStatusUser(cStatus)
		}

	}

	if status.State != runtimeapi.ContainerState_CONTAINER_CREATED {
		// If container is not in the created state, we have tried and
		// started the container. Set the StartedAt time.
		cStatus.StartedAt = time.Unix(0, status.StartedAt)
	}
	if status.State == runtimeapi.ContainerState_CONTAINER_EXITED {
		cStatus.Reason = status.Reason
		cStatus.Message = status.Message
		cStatus.ExitCode = int(status.ExitCode)

      status: "True"
      type: Accepted
    - lastTransitionTime: fake
      message: No errors found
      reason: NoConflicts
      status: "False"
      type: Conflicted
    - lastTransitionTime: fake
      message: No errors found
      reason: Programmed
      status: "True"
      type: Programmed
    - lastTransitionTime: fake
      message: No errors found
      reason: ResolvedRefs
      status: "True"