Enhance test case setup, skip if get_start_method() is not set to 'fork'

Author: zangjiucheng

Lib/test/_test_multiprocessing.py

@@ -6844,21 +6844,21 @@ def f(x): return x*x
         self.assertEqual("332833500", out.decode('utf-8').strip())
         self.assertFalse(err, msg=err.decode('utf-8'))
 
-    @support.requires_fork()
-    def test_forked_not_started(self):
-        # gh-134381
-        # Ensure that a forked parent process, which has not been started yet,
-        # can be initiated within the child process.
-
-        ctx = multiprocessing.get_context("fork")   # local “fork” cont
-        q = ctx.Queue()
+    def test_forked_thread_not_started(self):
+        # gh-134381: Ensure that a thread that has not been started yet in
+        # the parent process can be started within a forked child process.
+
+        if multiprocessing.get_start_method() != "fork":
+            self.skipTest("fork specific test")
+
+        q = multiprocessing.Queue()
         t = threading.Thread(target=lambda: q.put("done"), daemon=True)
 
         def child():
             t.start()
             t.join()
 
-        p = ctx.Process(target=child)
+        p = multiprocessing.Process(target=child)
         p.start()
         p.join(support.SHORT_TIMEOUT)