Add per-interpreter storage for `gil_safe_call_once_and_store` #10418

test_import_in_subinterpreter_concurrently Failed: Subprocess failed with exit code 1. Code: ```python import gc import sys from concurrent.futures import InterpreterPoolExecutor, as_completed sys.path.append('.') def test(): import collections import mod_per_interpreter_gil_with_singleton as m objects = m.get_objects_in_singleton() assert objects == [ type(None), tuple, list, dict, collections.OrderedDict, collections.defaultdict, collections.deque, ] assert hasattr(m, 'MyClass') assert hasattr(m, 'MyGlobalError') assert hasattr(m, 'MyLocalError') assert hasattr(m, 'MyEnum') futures = future = None with InterpreterPoolExecutor(max_workers=16) as executor: futures = [executor.submit(test) for _ in range(32)] for future in as_completed(futures): future.result() del futures, future, executor for _ in range(5): gc.collect() ``` Output: Traceback (most recent call last): File "/opt/hostedtoolcache/Python/3.14.2/x64/lib/python3.14/concurrent/futures/interpreter.py", line 84, in run return self.interp.call(do_call, self.results, *task) ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.14.2/x64/lib/python3.14/concurrent/interpreters/__init__.py", line 238, in call return self._call(callable, args, kwargs) ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.14.2/x64/lib/python3.14/concurrent/interpreters/__init__.py", line 222, in _call raise ExecutionFailed(excinfo) concurrent.interpreters.ExecutionFailed: ImportError: generic_type: type "MyClass" is already registered! Uncaught in the interpreter: Traceback (most recent call last): File "/opt/hostedtoolcache/Python/3.14.2/x64/lib/python3.14/concurrent/futures/interpreter.py", line 11, in do_call return func(*args, **kwargs) File "<string>", line 9, in test ImportError: generic_type: type "MyClass" is already registered! The above exception was the direct cause of the following exception: Traceback (most recent call last): File "<string>", line 31, in <module> future.result() ~~~~~~~~~~~~~^^ File "/opt/hostedtoolcache/Python/3.14.2/x64/lib/python3.14/concurrent/futures/_base.py", line 443, in result return self.__get_result() ~~~~~~~~~~~~~~~~~^^ File "/opt/hostedtoolcache/Python/3.14.2/x64/lib/python3.14/concurrent/futures/_base.py", line 395, in __get_result raise self._exception File "/opt/hostedtoolcache/Python/3.14.2/x64/lib/python3.14/concurrent/futures/thread.py", line 86, in run result = ctx.run(self.task) File "/opt/hostedtoolcache/Python/3.14.2/x64/lib/python3.14/concurrent/futures/interpreter.py", line 91, in run raise exc from wrapper ImportError: generic_type: type "MyClass" is already registered!

🐍 (ubuntu-latest, 3.14, -DCMAKE_CXX_STANDARD=14 -DCMAKE_CXX_FLAGS="-DPYBIND11_HAS_SUBINTERPRET... / 🧪: tests/test_multiple_interpreters/test_multiple_interpreters.py#L339

test_import_in_subinterpreter_before_main Failed: Subprocess failed with exit code 1. Code: ```python import sys sys.path.append('.') def test(): import collections import mod_per_interpreter_gil_with_singleton as m objects = m.get_objects_in_singleton() assert objects == [ type(None), tuple, list, dict, collections.OrderedDict, collections.defaultdict, collections.deque, ] assert hasattr(m, 'MyClass') assert hasattr(m, 'MyGlobalError') assert hasattr(m, 'MyLocalError') assert hasattr(m, 'MyEnum') import contextlib import gc from concurrent import interpreters interp = None with contextlib.closing(interpreters.create()) as interp: interp.call(test) test() del interp for _ in range(5): gc.collect() ``` Output: Traceback (most recent call last): File "<string>", line 33, in <module> test() ~~~~^^ File "<string>", line 10, in test assert objects == [ ^^^^^^^^^^^^ ...<7 lines>... ] ^ AssertionError

🐍 (ubuntu-latest, 3.14, -DCMAKE_CXX_STANDARD=14 -DCMAKE_CXX_FLAGS="-DPYBIND11_HAS_SUBINTERPRET... / 🧪: tests/test_multiple_interpreters/test_multiple_interpreters.py#L283

test_import_in_subinterpreter_after_main Failed: Subprocess failed with exit code 1. Code: ```python import sys sys.path.append('.') def test(): import collections import mod_per_interpreter_gil_with_singleton as m objects = m.get_objects_in_singleton() assert objects == [ type(None), tuple, list, dict, collections.OrderedDict, collections.defaultdict, collections.deque, ] assert hasattr(m, 'MyClass') assert hasattr(m, 'MyGlobalError') assert hasattr(m, 'MyLocalError') assert hasattr(m, 'MyEnum') import contextlib import gc from concurrent import interpreters test() interp = None with contextlib.closing(interpreters.create()) as interp: interp.call(test) del interp for _ in range(5): gc.collect() ``` Output: Traceback (most recent call last): File "<string>", line 33, in <module> interp.call(test) ~~~~~~~~~~~^^^^^^ File "/opt/hostedtoolcache/Python/3.14.2/x64/lib/python3.14/concurrent/interpreters/__init__.py", line 238, in call return self._call(callable, args, kwargs) ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/hostedtoolcache/Python/3.14.2/x64/lib/python3.14/concurrent/interpreters/__init__.py", line 222, in _call raise ExecutionFailed(excinfo) concurrent.interpreters.ExecutionFailed: ImportError: generic_type: type "MyClass" is already registered! Uncaught in the interpreter: Traceback (most recent call last): File "<string>", line 7, in test ImportError: generic_type: type "MyClass" is already registered!

🐍 (ubuntu-latest, 3.14, -DCMAKE_CXX_STANDARD=14 -DCMAKE_CXX_FLAGS="-DPYBIND11_HAS_SUBINTERPRET... / 🧪: tests/test_multiple_interpreters/test_multiple_interpreters.py#L251

test_import_module_with_singleton_per_interpreter concurrent.interpreters.ExecutionFailed: ImportError: pybind11::native_enum<...>("MyEnum") is already registered as a `pybind11::enum_` or `pybind11::class_`! Uncaught in the interpreter: Traceback (most recent call last): File "<script>", line 25, in <module> File "<script>", line 7, in test ImportError: pybind11::native_enum<...>("MyEnum") is already registered as a `pybind11::enum_` or `pybind11::class_`!

🐍 (windows-2022, 3.8, -DCMAKE_MSVC_RUNTIME_LIBRARY=MultiThreaded -DPYBIND11_NUMPY_1_ONLY=ON) / 🧪