If I’m understanding correctly can’t you lock on some other account criteria, like IDs? A Mutex does have to own the data but you can still decide what it owns.

If I’m understanding correctly can’t you lock on some other account criteria, like IDs? A Mutex does have to own the data but you can still decide what it owns. When you lock, the returned MutexGuard is owned, so you can pass it around or return it and it’s only dropped when it ultimately goes out of scope.