Issue #11815: Use a light-weight SimpleQueue for the result queue in concurrent.futur...

diff --git a/Lib/concurrent/futures/process.py b/Lib/concurrent/futures/process.py
index 36cd411fc135d95d3875d2fdf0c936f5d0b0809a..1f4b242454a1a4967b89bbe5a1a103bf998f7a3c 100644 (file)
--- a/Lib/concurrent/futures/process.py
+++ b/Lib/concurrent/futures/process.py
@@ -49,6 +49,7 @@ import atexit
 from concurrent.futures import _base
 import queue
 import multiprocessing
+from multiprocessing.queues import SimpleQueue
 import threading
 import weakref
 
@@ -204,7 +205,7 @@ def _queue_manangement_worker(executor_reference,
                                 work_ids_queue,
                                 call_queue)
 
-        result_item = result_queue.get(block=True)
+        result_item = result_queue.get()
         if result_item is not None:
             work_item = pending_work_items[result_item.work_id]
             del pending_work_items[result_item.work_id]
@@ -284,7 +285,7 @@ class ProcessPoolExecutor(_base.Executor):
         # because futures in the call queue cannot be cancelled.
         self._call_queue = multiprocessing.Queue(self._max_workers +
                                                  EXTRA_QUEUED_CALLS)
-        self._result_queue = multiprocessing.Queue()
+        self._result_queue = SimpleQueue()
         self._work_ids = queue.Queue()
         self._queue_management_thread = None
         self._processes = set()

diff --git a/Misc/NEWS b/Misc/NEWS
index cbbde80598b2c816cb951b7ac15a2d839aa7e77b..25dfd910c81ec81d1d11cfd9ddd64df18ff9736b 100644 (file)
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -103,6 +103,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #11815: Use a light-weight SimpleQueue for the result queue in
+  concurrent.futures.ProcessPoolExecutor.
+
 - Issue #5162: Treat services like frozen executables to allow child spawning
   from multiprocessing.forking on Windows.