On, Thu Jun 12, 2008, Greg Ewing wrote: > Marcus von Appen wrote: > > > It is - at least for me - no error, if I try to unlock a surface that a) > > has no locks or b) is locked by something else. > > But consider the following sequence: > > 1. Something else locks the surface. > 2. I lock the surface -- nothing happens, it's already locked. > 3. Something else unlocks the surface. > 4. I unlock the surface -- nothing happens, it's already unlocked. > > In between 3 and 4, I think the surface is locked, > but it's not. No, locks are cumulative. Sorry, if I did not mention that. Regards Marcus
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