[issue40600] Add option to disallow > 1 instance of an extension module

[mohamed koubaa]

mohamed koubaa <kouba...@gmail.com> added the comment:

Something like this?

```
static PyObject *def;

PyMODINIT_FUNC
PyInit_mymod(void)
{
    if (def == NULL) {
       def = PyModuleDef_Init(&mymod);
    }
    return def;
}
```

Then add a flag to PyModuleDef to indicate it is already exec?

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<https://bugs.python.org/issue40600>
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