[issue29423] using concurrent.futures.ProcessPoolExecutor in class giving 'TypeError: can't pickle _thread.RLock objects' in 3.6, but not 3.5

[R. David Murray]

R. David Murray added the comment:

The fact that RLock's *appeared* to be picklable was a bug in previous versions of python (see issue 22995).

If you had code that worked before actually using the locks then perhaps there is a deeper error, though, so I'm nosying Serhiy to take a look at this (I don't use concurrent.futures so I'm not qualified to evaluate your example for validity).

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assignee:  -> terry.reedy
nosy: +r.david.murray, serhiy.storchaka, terry.reedy

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<http://bugs.python.org/issue29423>
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