From 1a275013d1ecc2e3778d64fda86174b2f13d6969 Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@python.org>
Date: Mon, 27 Apr 2020 20:53:37 +0200
Subject: [PATCH] bpo-30966: concurrent.futures.Process.shutdown() closes queue
 (GH-19738)

Process.shutdown(wait=True) of concurrent.futures now closes
explicitly the result queue.
---
 Lib/concurrent/futures/process.py                               | 2 ++
 .../next/Library/2020-04-27-20-27-39.bpo-30966.Xmtlqu.rst       | 2 ++
 2 files changed, 4 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Library/2020-04-27-20-27-39.bpo-30966.Xmtlqu.rst

diff --git a/Lib/concurrent/futures/process.py b/Lib/concurrent/futures/process.py
index 36355ae8756..8e9b69a8f08 100644
--- a/Lib/concurrent/futures/process.py
+++ b/Lib/concurrent/futures/process.py
@@ -728,6 +728,8 @@ class ProcessPoolExecutor(_base.Executor):
         # objects that use file descriptors.
         self._executor_manager_thread = None
         self._call_queue = None
+        if self._result_queue is not None and wait:
+            self._result_queue.close()
         self._result_queue = None
         self._processes = None
 
diff --git a/Misc/NEWS.d/next/Library/2020-04-27-20-27-39.bpo-30966.Xmtlqu.rst b/Misc/NEWS.d/next/Library/2020-04-27-20-27-39.bpo-30966.Xmtlqu.rst
new file mode 100644
index 00000000000..85b7934ba66
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2020-04-27-20-27-39.bpo-30966.Xmtlqu.rst
@@ -0,0 +1,2 @@
+``Process.shutdown(wait=True)`` of :mod:`concurrent.futures` now closes
+explicitly the result queue.