Refactor test

Author: YvesDup

Lib/test/test_thread.py

@@ -378,20 +378,20 @@ def nop(i, **kwargs):
                 args=(shared, stop, f"dynamic_{i}", 1000)
                 thread.start_new_thread(mutator, args)
 
-            snt = 32
+            snt = 16
             for i in range(snt):
                 try:
                     thread.start_new_thread(nop, (i,), shared)
                 except RuntimeError:
                     break
 
             stop.acquire()
-            self.assertTrue(True, "test done")
-            # wait for all mutator threads stop.
             DELAY = 1.0
-            wait_t = time.monotonic()
-            while len(results) < n and time.monotonic() - wait_t < DELAY:
-                time.sleep(0.001)
+            # wait for all mutator threads stop.
+            for _ in support.sleeping_retry(DELAY):
+                if len(results) == n:
+                    break
+            self.assertTrue(True, "test successful")
 
 
 class Barrier: