[issue39465] Design a subinterpreter friendly alternative to _Py_IDENTIFIER

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

Once I discussed with Eric Snow during a core developer sprint: _Py_IDENTIFIER() should use an "interpreter local storage" for identifiers values. _Py_IDENTIFIER() would only be a "key" and _PyUnicode_FromId() would store the value somewhere in a hash table stored in PyInterpreterState. Something similar to the TSS API:

* PyThread_create_key()
* PyThread_delete_key_value()
* PyThread_set_key_value()
* PyThread_get_key_value()

But per interpreter, rather than being per thread.

The key can be simply the variable address in memory. It only has to be unique in the process.

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nosy: +vstinner

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<https://bugs.python.org/issue39465>
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