gh-84559: Remove the new multiprocessing warning, too disruptive. (#101551)

This reverts the core of #100618 while leaving relevant documentation
improvements and minor refactorings in place.

1 files changed, 0 insertions, 19 deletions

diff --git a/Lib/test/test_concurrent_futures.py b/Lib/test/test_concurrent_futures.py
index 4493cd31252..b3520ae3994 100644
--- a/Lib/test/test_concurrent_futures.py
+++ b/Lib/test/test_concurrent_futures.py
@@ -18,7 +18,6 @@ import sys
 import threading
 import time
 import unittest
-import warnings
 import weakref
 from pickle import PicklingError
 
@@ -572,24 +571,6 @@ class ProcessPoolShutdownTest(ExecutorShutdownTest):
         assert all([r == abs(v) for r, v in zip(res, range(-5, 5))])
 
 
-@unittest.skipIf(mp.get_all_start_methods()[0] != "fork", "non-fork default.")
-class ProcessPoolExecutorDefaultForkWarning(unittest.TestCase):
-    def test_fork_default_warns(self):
-        with self.assertWarns(mp.context.DefaultForkDeprecationWarning):
-            with futures.ProcessPoolExecutor(2):
-                pass
-
-    def test_explicit_fork_does_not_warn(self):
-        with warnings.catch_warnings(record=True) as ws:
-            warnings.simplefilter("ignore")
-            warnings.filterwarnings(
-                'always', category=mp.context.DefaultForkDeprecationWarning)
-            ctx = mp.get_context("fork")  # Non-default fork context.
-            with futures.ProcessPoolExecutor(2, mp_context=ctx):
-                pass
-        self.assertEqual(len(ws), 0, msg=[str(x) for x in ws])
-
-
 create_executor_tests(ProcessPoolShutdownTest,
                       executor_mixins=(ProcessPoolForkMixin,
                                        ProcessPoolForkserverMixin,