[issue1021318] PyThreadState_Next not thread safe

[Julien Danjou]

Julien Danjou <julien at danjou.info> added the comment:

It'd be great if you could reopen it. I'm interested in fixing it properly.

It's impossible to "solve" in Python 2 since the head mutex is not accessible (it's static in pystate.c) but this is doable with Python 3 (yay).

We'd simply need to provide a new API to lock/unlock the interpreter's mutex.

How hard to you need the script to reproduce? I can try to spend some time to extract some of my code to have one if that's really needed (I'm using Cython to generate some of the C code).

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<https://bugs.python.org/issue1021318>
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