Fix the regression test's wait timeout and signalled indices

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: ekanshul

Lib/test/_test_multiprocessing.py

@@ -5923,18 +5923,23 @@ def test_exhaustive_wait_more_than_60_handles(self):
         import _winapi
         from multiprocessing.connection import _exhaustive_wait
 
-        # More than 60 handles takes the batched path.
+        # More than 60 handles takes the batched path. Manual reset events
+        # stay signalled, so the handles the batched wait already reported
+        # must be dropped from the list that is scanned afterwards.
         events = [_winapi.CreateEventW(0, True, False, None)
                   for _ in range(70)]
         self.addCleanup(lambda: [_winapi.CloseHandle(e) for e in events])
 
-        # Spread the signalled events out so they do not all land in the
-        # first batch, and leave index 0 unsignalled.
-        chosen = [3, 17, 42, 68]
+        # BatchedWaitForMultipleObjects reports the lowest signalled handle
+        # of each 63 handle batch, so signalling the first event pins the
+        # first reported index at 0 and spreads the rest over both batches.
+        chosen = [0, 17, 42, 68]
         for i in chosen:
             _winapi.SetEvent(events[i])
 
-        ready = _exhaustive_wait(events, 0)
+        # A zero timeout is not usable here: the batched wait would report a
+        # timeout before its worker threads have run.
+        ready = _exhaustive_wait(events, 10_000)
         self.assertEqual(sorted(ready), sorted(events[i] for i in chosen))
 
 #