[3.6] bpo-30395 _PyGILState_Reinit deadlock fix (GH-1734) #1740
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head_lock could be held by another thread when fork happened. We should reset it to avoid deadlock. (cherry picked from commit f82c951)
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head_lock could be held by another thread when fork happened. We should
reset it to avoid deadlock.
(cherry picked from commit f82c951)