Is it possible to use a UML sequence diagram to modelling multiple threads? Well, I did draw a diagram for this purpose, and I think the drawing is easy to understand, but some of my friends said that sequence diagrams are only for modelling classes and objects. They said that my way of modelling is not correct because threads are not objects or classes.
So is it true that we can't use sequence diagrams for modelling threads?
Thank you for reading my question.