Add get_int_max_str_digits() to the test

Author: vstinner

Lib/test/test_free_threading/test_sys.py

@@ -5,18 +5,23 @@
 
 class SysModuleTest(unittest.TestCase):
     def test_int_max_str_digits_thread(self):
-        # gh-151218: Check that it's safe to call set_int_max_str_digits()
-        # in parallel. Previously, this test triggered warnings in TSan
-        # on a free threaded build.
+        # gh-151218: Check that it's safe to call get_int_max_str_digits() and
+        # set_int_max_str_digits() in parallel. Previously, this test triggered
+        # warnings in TSan on a free threaded build.
 
         old_limit = sys.get_int_max_str_digits()
         self.addCleanup(sys.set_int_max_str_digits, old_limit)
 
-        def worker():
-            for i in range (20_000):
-                sys.set_int_max_str_digits(4300 + (i & 7))
+        def worker(worker_id):
+            if not worker_id:
+                for i in range (20_000):
+                    sys.get_int_max_str_digits()
+            else:
+                for i in range (20_000):
+                    sys.set_int_max_str_digits(4300 + (i & 7))
 
-        threading_helper.run_concurrently(worker, nthreads=4)
+        workers = [lambda: worker(i) for i in range(5)]
+        threading_helper.run_concurrently(workers)
 
 
 if __name__ == "__main__":