start := ev.Time()
		if from == trace.GoUndetermined {
			// Back-date the event to the start of the trace.
			start = ctx.startTime
		}
		// Write down that we've entered a syscall. Note: we might have no P here
		// if we're in a cgo callback or this is a transition from GoUndetermined
		// (i.e. the G has been blocked in a syscall).
		gs.syscallBegin(start, ev.Proc(), ev.Stack())

	//
	// decision.Set is called with the queueSet locked.
	// decision.Get is called without the queueSet locked.
	decision promise.WriteOnce

	// arrivalTime is the real time when the request entered this system
	arrivalTime time.Time

	// descr1 and descr2 are not used in any logic but they appear in
	// log messages
	descr1, descr2 interface{}

	queueNoteFn fq.QueueNoteFn

	rdsSendErrPushes = pushes.With(typeTag.Value("rds_senderr"))

	debounceTime = monitoring.NewDistribution(
		"pilot_debounce_time",
		"Delay in seconds between the first config enters debouncing and the merged push request is pushed into the push queue.",
		[]float64{.01, .1, 1, 3, 5, 10, 20, 30},
	)

	pushContextInitTime = monitoring.NewDistribution(
		"pilot_pushcontext_init_seconds",

	// is evicted from the cache, then the allowance for that bucket is reset. If
	// more queries are later received for an evicted bucket, then that bucket
	// will re-enter the cache with a clean slate, giving that bucket a full
	// allowance of burst queries.
	//
	// The default cache size is 4096.
	//
	// If limitType is 'server', then cacheSize is ignored.
	// +optional

    return method.getAnnotation(AllowConcurrentEvents.class) != null;
  }

  /**
   * Subscriber that synchronizes invocations of a method to ensure that only one thread may enter
   * the method at a time.
   */
  @VisibleForTesting
  static final class SynchronizedSubscriber extends Subscriber {

    private SynchronizedSubscriber(EventBus bus, Object target, Method method) {

    return method.getAnnotation(AllowConcurrentEvents.class) != null;
  }

  /**
   * Subscriber that synchronizes invocations of a method to ensure that only one thread may enter
   * the method at a time.
   */
  @VisibleForTesting
  static final class SynchronizedSubscriber extends Subscriber {

    private SynchronizedSubscriber(EventBus bus, Object target, Method method) {

#   $2: The full path of the output binary.
#   $3: Non-versioned name to use
function download_ztunnel_if_necessary () {
  if [[ -f "$2" ]]; then
    return
  fi
  # Enter the output directory.
  mkdir -p "$(dirname "$2")"
  pushd "$(dirname "$2")"

  # Download and make the binary executable
  echo "Downloading ztunnel: $1 to $2"

			// in _Pgcstop, but we model it as running in the tracer.
			status = traceProcRunning
		}
	case _Prunning:
		status = traceProcRunning
		// There's a short window wherein the goroutine may have entered _Gsyscall
		// but it still owns the P (it's not in _Psyscall yet). The goroutine entering
		// _Gsyscall is the tracer's signal that the P its bound to is also in a syscall,
		// so we need to emit a status that matches. See #64318.

		if calls.Add(1) == 1 {
			// First invocation.
			wg1.Done()
		}
		v := <-c
		c <- v // pump; make available for any future calls

		time.Sleep(10 * time.Millisecond) // let more goroutines enter Do

		return v, nil
	}

	const n = 10
	wg1.Add(1)
	for i := 0; i < n; i++ {
		wg1.Add(1)
		wg2.Add(1)
		go func() {
			defer wg2.Done()
			wg1.Done()
			v, err, _ := g.Do("key", fn)

# Params:
#   $1: The URL of the Envoy tar.gz to be downloaded.
#   $2: The full path of the output binary.
#   $3: Non-versioned name to use
function download_envoy_if_necessary () {
  if [[ ! -f "$2" ]] ; then
    # Enter the output directory.
    mkdir -p "$(dirname "$2")"
    pushd "$(dirname "$2")"

    # Download and extract the binary to the output directory.
    echo "Downloading ${SIDECAR}: $1 to $2"