Deadlock on close w/ zkpython / c client
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Key: ZOOKEEPER-763
URL: https://issues.apache.org/jira/browse/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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