How to implement a RwLock lock

[QMaster]

The first item might be implemented like this: 
    
    
    type DataWithLock = object
      dataLock*: Lock
      data* {.guard: dataLock.}: AppData
    
    
    Run

I'm not sure that guard will work without type definition, but it might.(never 
did so myself) It will compile with --threads:on only and will warn you if you 
are accessing to data without locking.