Add a test.

python · encukou · Jan 13, 2025 · Jan 4, 2025 · Jan 4, 2025 · Jan 4, 2025
commit 8c4c49a4c1862274b66c620fbbd72f8e807e42ef
diff --git a/Lib/test/test_ctypes/test_arrays.py b/Lib/test/test_ctypes/test_arrays.py
@@ -5,7 +5,7 @@
                     create_string_buffer, create_unicode_buffer,
                     c_char, c_wchar, c_byte, c_ubyte, c_short, c_ushort, c_int, c_uint,
                     c_long, c_ulonglong, c_float, c_double, c_longdouble)
-from test.support import bigmemtest, _2G
+from test.support import bigmemtest, _2G, threading_helper
 from ._support import (_CData, PyCArrayType, Py_TPFLAGS_DISALLOW_INSTANTIATION,
                        Py_TPFLAGS_IMMUTABLETYPE)
 
@@ -267,6 +267,24 @@ def test_bpo36504_signed_int_overflow(self):
     def test_large_array(self, size):
         c_char * size
 
+    @threading_helper.requires_working_threading()
+    @unittest.skipUnless(support.Py_GIL_DISABLED, "only meaningful if the GIL is disabled")
+    def test_thread_safety(self):
+        from threading import Thread
+
+        buffer = (ctypes.c_char_p * 10)()
+
+        def run():
+            for i in range(100):
+                buffer.value = b"hello"
+                buffer[0] = b"j"
+
+        with threading_helper.catch_threading_exception() as cm:
+            with threading_helper.start_threads((run for _ in range(25))):
+                pass
+
+            self.assertIsNone(cm.exc_value)
+
 
 if __name__ == '__main__':
     unittest.main()