Sanity check: Finally

[Ed Kleban <Ed at Kleban dot com>]

I've never used the new "finally" clause before.  Is this correct usage to
ensure that both:

1) The semaphore gets released even if an exception is caught, and

2) The caught exception will be passed on up?

I.e. is the finally clause guaranteed to execute before the catch clause
raises the error again?

 
  
  if updateInProgress.TrySignal then  // Request permission to update
    try
     self.doSomething
    catch err as RuntimeException
      raise err  // Pass err on up.
    finally
      updateInProgress.Release
    end try
  end if


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