From a763ee3c583e6a2dfe1b1ac0600a48e8a978ed50 Mon Sep 17 00:00:00 2001
From: Shantanu <12621235+hauntsaninja@users.noreply.github.com>
Date: Wed, 2 Sep 2020 12:28:28 -0700
Subject: [PATCH] [3.9] bpo-39349: Add cancel_futures to Executor.shutdown base
 class (GH-22023) (GH-22048)

* Add cancel_futures parameter to the Executor base class, since it was missed in the original PR (https://github.com/python/cpython/pull/18057) that added cancel_futures.
(cherry picked from commit 17dc1b7)
---
 Lib/concurrent/futures/_base.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Lib/concurrent/futures/_base.py b/Lib/concurrent/futures/_base.py
index bf546f8ae1d1..00eb54881f29 100644
--- a/Lib/concurrent/futures/_base.py
+++ b/Lib/concurrent/futures/_base.py
@@ -605,7 +605,7 @@ class Executor(object):
                     future.cancel()
         return result_iterator()
 
-    def shutdown(self, wait=True):
+    def shutdown(self, wait=True, *, cancel_futures=False):
         """Clean-up the resources associated with the Executor.
 
         It is safe to call this method several times. Otherwise, no other
@@ -615,6 +615,9 @@ class Executor(object):
             wait: If True then shutdown will not return until all running
                 futures have finished executing and the resources used by the
                 executor have been reclaimed.
+            cancel_futures: If True then shutdown will cancel all pending
+                futures. Futures that are completed or running will not be
+                cancelled.
         """
         pass
 
-- 
2.47.3