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Destroy internals if created during Py_Finalize()
Py_Finalize could potentially invoke code that calls `get_internals()`, which could create a new internals object if one didn't exist. `finalize_interpreter()` didn't catch this because it only used the pre-finalize interpreter pointer status; if this happens, it results in the internals pointer not being properly destroyed with the interpreter, which leaks, and also causes a `get_internals()` under a future interpreter to return an internals object that is wrong in various ways.
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@ -143,7 +143,11 @@ inline void finalize_interpreter() {
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handle builtins(PyEval_GetBuiltins());
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const char *id = PYBIND11_INTERNALS_ID;
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detail::internals **internals_ptr_ptr = nullptr;
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// Get the internals pointer (without creating it if it doesn't exist). It's possible for the
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// internals to be created during Py_Finalize() (e.g. if a py::capsule calls `get_internals()`
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// during destruction), so we get the pointer-pointer here and check it after Py_Finalize().
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detail::internals **internals_ptr_ptr = &detail::get_internals_ptr();
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// It could also be stashed in builtins, so look there too:
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if (builtins.contains(id) && isinstance<capsule>(builtins[id]))
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internals_ptr_ptr = capsule(builtins[id]);
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@ -84,15 +84,20 @@ TEST_CASE("There can be only one interpreter") {
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py::initialize_interpreter();
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}
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bool has_pybind11_internals() {
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bool has_pybind11_internals_builtin() {
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auto builtins = py::handle(PyEval_GetBuiltins());
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return builtins.contains(PYBIND11_INTERNALS_ID);
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};
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bool has_pybind11_internals_static() {
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return py::detail::get_internals_ptr() != nullptr;
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}
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TEST_CASE("Restart the interpreter") {
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// Verify pre-restart state.
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REQUIRE(py::module::import("widget_module").attr("add")(1, 2).cast<int>() == 3);
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REQUIRE(has_pybind11_internals());
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REQUIRE(has_pybind11_internals_builtin());
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REQUIRE(has_pybind11_internals_static());
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// Restart the interpreter.
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py::finalize_interpreter();
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@ -102,9 +107,27 @@ TEST_CASE("Restart the interpreter") {
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REQUIRE(Py_IsInitialized() == 1);
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// Internals are deleted after a restart.
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REQUIRE_FALSE(has_pybind11_internals());
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REQUIRE_FALSE(has_pybind11_internals_builtin());
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REQUIRE_FALSE(has_pybind11_internals_static());
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pybind11::detail::get_internals();
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REQUIRE(has_pybind11_internals());
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REQUIRE(has_pybind11_internals_builtin());
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REQUIRE(has_pybind11_internals_static());
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// Make sure that an interpreter with no get_internals() created until finalize still gets the
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// internals destroyed
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py::finalize_interpreter();
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py::initialize_interpreter();
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bool ran = false;
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py::module::import("__main__").attr("internals_destroy_test") =
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py::capsule(&ran, [](void *ran) { py::detail::get_internals(); *static_cast<bool *>(ran) = true; });
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REQUIRE_FALSE(has_pybind11_internals_builtin());
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REQUIRE_FALSE(has_pybind11_internals_static());
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REQUIRE_FALSE(ran);
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py::finalize_interpreter();
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REQUIRE(ran);
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py::initialize_interpreter();
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REQUIRE_FALSE(has_pybind11_internals_builtin());
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REQUIRE_FALSE(has_pybind11_internals_static());
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// C++ modules can be reloaded.
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auto cpp_module = py::module::import("widget_module");
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@ -125,7 +148,8 @@ TEST_CASE("Subinterpreter") {
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REQUIRE(m.attr("add")(1, 2).cast<int>() == 3);
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}
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REQUIRE(has_pybind11_internals());
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REQUIRE(has_pybind11_internals_builtin());
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REQUIRE(has_pybind11_internals_static());
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/// Create and switch to a subinterpreter.
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auto main_tstate = PyThreadState_Get();
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@ -134,7 +158,8 @@ TEST_CASE("Subinterpreter") {
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// Subinterpreters get their own copy of builtins. detail::get_internals() still
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// works by returning from the static variable, i.e. all interpreters share a single
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// global pybind11::internals;
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REQUIRE_FALSE(has_pybind11_internals());
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REQUIRE_FALSE(has_pybind11_internals_builtin());
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REQUIRE(has_pybind11_internals_static());
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// Modules tags should be gone.
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REQUIRE_FALSE(py::hasattr(py::module::import("__main__"), "tag"));
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