Function test_independent_subinterpreters

tests/test_multiple_interpreters.py:89–133

Makes sure the internals object differs across independent subinterpreters

()

    sys.platform.startswith("emscripten"), reason="Requires loadable modules"
)
def test_independent_subinterpreters():
    """Makes sure the internals object differs across independent subinterpreters"""

    sys.path.insert(0, os.path.dirname(pybind11_tests.__file__))

    run_string, create = get_interpreters(modern=True)

    import mod_per_interpreter_gil as m

    if not m.defined_PYBIND11_HAS_SUBINTERPRETER_SUPPORT:
        pytest.skip("Does not have subinterpreter support compiled in")

    code = textwrap.dedent(
        """
        import mod_per_interpreter_gil as m
        import pickle
        with open(pipeo, 'wb') as f:
            pickle.dump(m.internals_at(), f)
        """
    ).strip()

    with create() as interp1, create() as interp2:
        try:
            res0 = run_string(interp1, "import mod_shared_interpreter_gil")
            if res0 is not None:
                res0 = str(res0)
        except Exception as e:
            res0 = str(e)

        pipei, pipeo = os.pipe()
        run_string(interp1, code, shared={"pipeo": pipeo})
        with open(pipei, "rb") as f:
            res1 = pickle.load(f)

        pipei, pipeo = os.pipe()
        run_string(interp2, code, shared={"pipeo": pipeo})
        with open(pipei, "rb") as f:
            res2 = pickle.load(f)

    assert "does not support loading in subinterpreters" in res0, (
        "cannot use shared_gil in a default subinterpreter"
    )
    assert res1 != m.internals_at(), "internals should differ from main interpreter"
    assert res2 != m.internals_at(), "internals should differ from main interpreter"
    assert res1 != res2, "internals should differ between interpreters"


@pytest.mark.skipif(