[issue34128] Release GIL periodically in _pickle module

[ppperry]

Change by ppperry <mapreader at olum.org>:


----------
components: +Library (Lib)
title: Do not block threads when pickle/unpickle -> Release GIL periodically in _pickle module

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34128>
_______________________________________