remove the heavy unit test which launches 4*1_000 os threads

Author: LindaSummer

Lib/test/test_free_threading/test_threading.py

@@ -1,6 +1,4 @@
 import unittest
-import threading
-import _thread
 from test.support import threading_helper
 
 threading_helper.requires_working_threading(module=True)
@@ -9,6 +7,7 @@
 class TestRlock(unittest.TestCase):
     def test_repr_race(self):
         # gh-153292
+        import _thread
         r = _thread.RLock()
 
         def repr_thread():
@@ -23,42 +22,5 @@ def mutate_thread():
         threading_helper.run_concurrently([repr_thread, mutate_thread])
 
 
-class TestShutdown(unittest.TestCase):
-    def test_shutdown_race(self):
-        ITERATIONS = 1_000
-        STARTUP_THREADS = 4
-
-        def shutdown_worker():
-            for _ in range(ITERATIONS):
-                try:
-                    _thread._shutdown()
-                except RuntimeError:
-                    pass
-
-        def startup_worker():
-            for _ in range(ITERATIONS):
-                handle = _thread.start_joinable_thread(
-                    lambda: None,
-                    daemon=False,
-                )
-                handle.join()
-
-        # The workers must be daemon threads so _thread._shutdown() ignores them
-        # and only scans the non-daemon handles created by startup_worker().
-        workers = [
-            threading.Thread(target=shutdown_worker, daemon=True),
-            *[
-                threading.Thread(target=startup_worker, daemon=True)
-                for _ in range(STARTUP_THREADS)
-            ],
-        ]
-
-        with threading_helper.catch_threading_exception() as cm:
-            with threading_helper.start_threads(workers):
-                pass
-            if cm.exc_value is not None:
-                raise cm.exc_value
-
-
 if __name__ == "__main__":
     unittest.main()