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.

      }
    }
    params.set(param, v);

    elem.href = url.toString();
  }

  // Capture Enter key in the search box to make it pivot instead of focus.
  function handleSearchKey(e) {
    if (e.key != 'Enter') return;
    e.stopImmediatePropagation();  // Disable normal enter key handling
    const val = search.value;
    try {
      new RegExp(search.value);
    } catch (error) {

[it acts as`pivot` for marking the loop termination condition](https://github.com/tensorflow/tensorflow/blob/master/tensorflow/core/kernels/control_flow_ops.h#L115-L118).

### `tf_executor.Enter` Operation

[`tf_executor.Enter`](https://github.com/tensorflow/tensorflow/blob/master/tensorflow/core/kernels/control_flow_ops.h##77-L79):
takes a single input and a`name` string attribute that identifies the execution