Issue #16284: Prevent keeping unnecessary references to worker functions in concurrent.futures ThreadPoolExecutor.
diff --git a/Lib/concurrent/futures/process.py b/Lib/concurrent/futures/process.py
index 94e0289..3c20b93 100644
--- a/Lib/concurrent/futures/process.py
+++ b/Lib/concurrent/futures/process.py
@@ -240,6 +240,8 @@
"terminated abruptly while the future was "
"running or pending."
))
+ # Delete references to object. See issue16284
+ del work_item
pending_work_items.clear()
# Terminate remaining workers forcibly: the queues or their
# locks may be in a dirty state and block forever.
@@ -264,6 +266,8 @@
work_item.future.set_exception(result_item.exception)
else:
work_item.future.set_result(result_item.result)
+ # Delete references to object. See issue16284
+ del work_item
# Check whether we should start shutting down.
executor = executor_reference()
# No more work items can be added if:
diff --git a/Lib/concurrent/futures/thread.py b/Lib/concurrent/futures/thread.py
index 95bb682..f9beb0f 100644
--- a/Lib/concurrent/futures/thread.py
+++ b/Lib/concurrent/futures/thread.py
@@ -63,6 +63,8 @@
work_item = work_queue.get(block=True)
if work_item is not None:
work_item.run()
+ # Delete references to object. See issue16284
+ del work_item
continue
executor = executor_reference()
# Exit if: