Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

Random idea (not carefully thought-out):  Would it be simpler to have these 
objects just ignore their refcount by having dealloc() be a null operation or 
having it set the refcount back to a positive number).  That would let 
sub-interpreters share the objects without worrying about race-conditions on 
incref/decref operations.  To make this work, the objects can register 
themselves as permanent, shared, objects; then, during shutdown, we could 
explicitly call a hard dealloc on those objects.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39511>
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