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import ctypes
import sys
import unittest
from test.support import threading_helper
from test.support.threading_helper import run_concurrently
_PyImport_AddModuleRef = ctypes.pythonapi.PyImport_AddModuleRef
_PyImport_AddModuleRef.argtypes = (ctypes.c_char_p,)
_PyImport_AddModuleRef.restype = ctypes.py_object
@threading_helper.requires_working_threading()
class TestImportCAPI(unittest.TestCase):
def test_pyimport_addmoduleref_thread_safe(self):
# gh-137422: Concurrent calls to PyImport_AddModuleRef with the same
# module name must return the same module object.
NUM_ITERS = 10
NTHREADS = 4
module_name = f"test_free_threading_addmoduleref_{id(self)}"
module_name_bytes = module_name.encode()
sys.modules.pop(module_name, None)
results = []
def worker():
module = _PyImport_AddModuleRef(module_name_bytes)
results.append(module)
for _ in range(NUM_ITERS):
try:
run_concurrently(worker_func=worker, nthreads=NTHREADS)
self.assertEqual(len(results), NTHREADS)
reference = results[0]
for module in results[1:]:
self.assertIs(module, reference)
self.assertIn(module_name, sys.modules)
self.assertIs(sys.modules[module_name], reference)
finally:
results.clear()
sys.modules.pop(module_name, None)
if __name__ == "__main__":
unittest.main()
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