Yes, I noticed just after I sent it but it might be helpful to someone else. I apologize to the group for the hasty post.

Take a look at `dispatchPrecondition` to test whether code is executing on a specific queue in a pattern like: func foo() { dispatchPrecondition(condition: .onQueue(mySpecialQueue)) ... } Hope it help

How about using the ‘didset’ observer? class SomeClass { var status: Int { didset(oldValue) { guard oldValue != status else { return } … do something here … } } }