[issue20891] PyGILState_Ensure on non-Python thread causes fatal error

[STINNER Victor]

STINNER Victor <victor.stinner at gmail.com> added the comment:

Antoine Pitrou considers that my PR 5421 for Python 3.6 should not be merged:
"@vstinner I don't think so. People can already call PyEval_InitThreads."
https://github.com/python/cpython/pull/5421#issuecomment-361214537

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