GoGtk3自定义信号

Question

I need to know how to write a custom signal in GoGtk3. Having a gui thread wherein gtk is working in, I want to update a textview from adjacent goroutine.

label,_:= gtk.LabelNew()

go func(){
   // This is listening to a websocket
   //update label
   for {
       c.ReadJSON(&frame) // c is my gorilla websocket 
       fmt.Printf("I received something %v
", frame)
       // label.SetText("update ...") is not working properly

       }
}()

When using label.SetText method, I noticed that this is not working correctly. I suspect this is not thread safe and I should emit a signal instead. I appreciate if you lead me how.