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Sequence diagram?

Multi-threading is not a static concept, it can only be reflected at runtime, so if you want to visualize it, you have to use a graphic to represent it, which itself has entered a misunderstanding

This has long been solved in the music industry,

That’s it: the score and parts of a symphony performance

Think of each instrument as a thread. How can many instruments cooperate to play a complete and beautiful symphony?
It is to arrange a certain instrument to play the right note at the right time.
The score is a multi-thread timing schedule diagram.
Beat is a timer.
The conductor is the scheduler.

uml activity diagram https://en.wikipedia.org/wiki...