[issue31282] C APIs called without GIL in PyOS_Readline

[STINNER Victor]

STINNER Victor added the comment:

You must hold the GIL to call PyMem_Malloc(). A debug assert should be
raised if you don't hold the GIL since Python 3.6 with PYTHONMALLOC=debug.

Call PyMem_RawMalloc().

I fixed Python 3, no?

For Python 2, in practice you can call PyMem_Malloc() without holding the
GIL, it's just malloc() which is thread safe.

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<http://bugs.python.org/issue31282>
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