Deadlock on close w/ zkpython / c client

                 Key: ZOOKEEPER-763
             Project: Zookeeper
          Issue Type: Bug
          Components: c client, contrib-bindings
    Affects Versions: 3.3.0, 3.4.0
         Environment: ubuntu 10.04, zookeeper 3.3.0 and trunk
            Reporter: Kapil Thangavelu

deadlocks occur if we attempt to close a handle while there are any outstanding 
async requests (aget, acreate, etc). Normally on close both the io thread 
terminates and the completion thread are terminated and joined, however w\ith 
outstanding async requests, the completion thread won't be in a joinable state, 
and we effectively hang when the main thread does the join.

afaics ideal behavior would be on close of a handle, to effectively clear out 
any remaining callbacks and let the completion thread terminate.

i've tried adding some bookkeeping to within a python client to guard against 
closing while there is an outstanding async completion request, but its an 
imperfect solution since even after the python callback is executed there is 
still a window for deadlock before the completion thread finishes the callback.

a simple example to reproduce the deadlock is attached.

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