}
		if goids := r.FormValue("goid"); goids != "" {
			// Render trace focused on a particular goroutine.

			id, err := strconv.ParseUint(goids, 10, 64)
			if err != nil {
				log.Printf("failed to parse goid parameter %q: %v", goids, err)
				return
			}
			goid := trace.GoID(id)
			g, ok := parsed.summary.Goroutines[goid]
			if !ok {
				log.Printf("failed to find goroutine %d", goid)

	globalMetricGenerator
	stackSampleGenerator[trace.GoID]
	logEventGenerator[trace.GoID]

	gStates map[trace.GoID]*gState[trace.GoID]
	focus   trace.GoID
	filter  map[trace.GoID]struct{}
}

func newGoroutineGenerator(ctx *traceContext, focus trace.GoID, filter map[trace.GoID]struct{}) *goroutineGenerator {
	gg := new(goroutineGenerator)
	rg := func(ev *trace.Event) trace.GoID {
		return ev.Goroutine()
	}

	}

	// Test the function.
	targetg := trace.GoID(86)
	got := trace.RelatedGoroutinesV2(events, targetg)
	want := map[trace.GoID]struct{}{
		trace.GoID(86):  struct{}{}, // N.B. Result includes target.
		trace.GoID(71):  struct{}{},
		trace.GoID(25):  struct{}{},
		trace.GoID(122): struct{}{},
	}
	for goid := range got {
		if _, ok := want[goid]; ok {
			delete(want, goid)
		} else {

		Tasks:      s.tasks,
	}
}

// RelatedGoroutinesV2 finds a set of goroutines related to goroutine goid for v2 traces.
// The association is based on whether they have synchronized with each other in the Go
// scheduler (one has unblocked another).
func RelatedGoroutinesV2(events []Event, goid GoID) map[GoID]struct{} {
	// Process all the events, looking for transitions of goroutines

// P in particular.
const NoProc = ProcID(-1)

// GoID is the runtime-internal G structure's goid field. This is unique
// for each goroutine.
type GoID int64

// NoGoroutine indicates that the relevant events don't correspond to any
// goroutine in particular.
const NoGoroutine = GoID(-1)

// GoState represents the state of a goroutine.
//

	case oldtrace.EvGoCreate:
		if it.preInit {
			it.createdPreInit[GoID(ev.Args[0])] = struct{}{}
			return Event{}, errSkip
		}
		mappedType = go122.EvGoCreate
	case oldtrace.EvGoStart:
		if it.preInit {
			mappedType = go122.EvGoStatus
			mappedArgs = timedEventArgs{ev.Args[0], ^uint64(0), uint64(go122.GoRunning)}
			delete(it.createdPreInit, GoID(ev.Args[0]))
		} else {
			mappedType = go122.EvGoStart
		}

	b21.Event("GoStart", trace.GoID(1), testgen.Seq(2))

	// The goroutine starts running, then stops, then starts again.
	b20 := g2.Batch(trace.ThreadID(0), 5)
	b20.Event("ProcStatus", trace.ProcID(0), go122.ProcRunning)
	b20.Event("GoStatus", trace.GoID(1), trace.ThreadID(0), go122.GoRunnable)
	b20.Event("GoStart", trace.GoID(1), testgen.Seq(1))
	b20.Event("GoStop", "whatever", testgen.NoStack)

	b0.Event("GoCreateSyscall", trace.GoID(4))
	b0.Event("ProcStatus", trace.ProcID(0), go122.ProcIdle)
	b0.Event("ProcStart", trace.ProcID(0), testgen.Seq(1))
	b0.Event("GoSyscallEndBlocked")
	b0.Event("GoStart", trace.GoID(4), testgen.Seq(1))
	b0.Event("GoSyscallBegin", testgen.Seq(2), testgen.NoStack)
	b0.Event("GoDestroySyscall")
	b0.Event("GoCreateSyscall", trace.GoID(4))
	b0.Event("GoSyscallEnd")

}

func (g *procGenerator) GoroutineTransition(ctx *traceContext, ev *trace.Event) {
	st := ev.StateTransition()
	goID := st.Resource.Goroutine()

	// If we haven't seen this goroutine before, create a new
	// gState for it.
	gs, ok := g.gStates[goID]
	if !ok {
		gs = newGState[trace.ProcID](goID)
		g.gStates[goID] = gs
	}
	// If we haven't already named this goroutine, try to name it.
	gs.augmentName(st.Stack)

			for ptr in SliceValue(gdb.parse_and_eval("'runtime.allgs'")):
				goids.append(int(ptr['goid']))
		else:
			goids = [int(gdb.parse_and_eval(goid_str))]

		for goid in goids:
			self.invoke_per_goid(goid, cmd)

	def invoke_per_goid(self, goid, cmd):
		pc, sp = find_goroutine(goid)
		if not pc:
			print("No such goroutine: ", goid)
			return
		pc = pc_to_int(pc)
		save_frame = gdb.selected_frame()