Sorry, ignore this email. I think the problem was that
I forgot to release the lock

  thomas

Thomas Guettler wrote:

>  I was told that it is possible to syncronise
>  several zope-request with methods from the python
>  library.
>  
>  But it is not that easy:
>  
>  If you try to add a threading.Lock() instance to
>  a python class you get:
>  
>  Error Type: UnpickleableError
>  Error Value: Cannot pickle objects
>  
>  This means, you have to store it in an volatile
>  attribute. I tried it like this. But this
>  hangs if I delete the object which has
>  the Lock as_v_lock instance.
>  
>  
>     def acquireLock(self):
>          print "StollDMS.acquireLock"
>          lock=getattr(self, "_v_lock", None)
>          if not lock:
>              self._v_lock=threading.Lock()
>              lock=self._v_lock
>          lock.acquire()
>  
>      def releaseLock(self):
>          # acquire() should have been called
>          # about one second before. This means the volatile lock
>          # should still be there
>          print "StollDMS.releaseLock"
>          self._v_lock.release()
>  
>  Any ideas?
>  
>   thomas
>  
>  
>  
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