Comment 10 for bug 1327946

So an idea how to make the above check and set atomic, what about using the file_lock primitives to do just this?

Acquire file_lock:
  - check sempahore owner
  - clear sempahore (if owner not found)
  - create semaphore (with self as owner)
Release

Now the above is using file locks to do the clearing only. Perhaps this can be a strategy thats provided by default in this new oslo.concurrency library and the library itself takes care of doing this logic described above in a correct manner.