func (app *App) Loop() {
	app.RLock()
	exitChan := app.exit
	app.RUnlock()

	if exitChan != nil {
		<-app.exit
	}
}
func (app *App) Loop() {
	app.RLock()
	exitChan := app.exit
	app.RUnlock()

	if exitChan != nil {
		<-app.exit
	}
}
// Loop ...