// may have changed by the time this function returns.
func IsEnabled() bool {
	return tracing.enabled.Load()
}

//
// Function bodies are defined in runtime/trace.go
//

// emits UserTaskCreate event.
func userTaskCreate(id, parentID uint64, taskType string)

// emits UserTaskEnd event.
func userTaskEnd(id uint64)

// emits UserRegion event.
func userRegion(id, mode uint64, regionType string)