things.sh | Simple read-only comand-line interface | Command Line Interface library

Do variables in functions have strong references to their objects?

Yes, thing will keep a strong reference to Things.sharedInstance.list[0]

Can they be deallocated in the runtime of a function body?

It depends on the context.

• If your code runs on a single sequential thread, the object thing points to will never be deallocated in the middle of function execution.
• If your code runs on multiple threads or concurrently, it can happen (I guess it's your case)

The problem here is that we are racing, modifying the object thing points to from multiple threads or concurrently. Leading to the two threads interleave operations like this: