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

[mohamed koubaa]

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

What about a new PyModuleDef_Slot function?


```
static int my_can_create(/*need any arg??, InterpreterState, etc?*/) {
    if (test_global_condition()) {
        return -1; //Don't allow creation
    }
    return 0; //Allow creation
};

static PyModuleDef_Slot signal_slots[] = {
    {Py_mod_exec, my_exec},
    {Py_mod_can_create, my_can_create},
    {0,0}
};

```

----------
nosy: +koubaa

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