[issue32879] Race condition in multiprocessing Queue

[Eric Meyer]

Eric Meyer  added the comment:

The problem I was seeing ended up being improper GIL management in a c++ 
extension. It seems putting items that were created without the GIL on the 
queue causes a seg fault.

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[issue32879] Race condition in multiprocessing Queue

[Eric Meyer]

Eric Meyer  added the comment:

multiprocessing.SimpleQueue is another workaround to this issue.

I agree the docs should be clearer about this. Additionally, it would be 
helpful if there was a way to optionally put an item on a multiprocessing.Queue 
and block until the item has been written to the pipe (or block until it is 
safe to mutate,garbage collect,etc the item in the calling thread).

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nosy: +highvelcty

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