bpo-45209: fix UserWarning: resource_tracker in test_multiprocessing (GH-28377)

miss-islington · sobolevn · web-flow · commit 09e5016f8bb0 · 2021-09-21T11:19:48.000-07:00
(cherry picked from commit f604cf1) Co-authored-by: Nikita Sobolev <mail@sobolevn.me>
diff --git a/Lib/test/_test_multiprocessing.py b/Lib/test/_test_multiprocessing.py
@@ -4178,6 +4178,13 @@ def test_shared_memory_cleaned_after_process_termination(self):
                                      " a process was abruptly terminated.")
 
             if os.name == 'posix':
+                # Without this line it was raising warnings like:
+                #   UserWarning: resource_tracker:
+                #   There appear to be 1 leaked shared_memory
+                #   objects to clean up at shutdown
+                # See: https://bugs.python.org/issue45209
+                resource_tracker.unregister(f"/{name}", "shared_memory")
+
                 # A warning was emitted by the subprocess' own
                 # resource_tracker (on Windows, shared memory segments
                 # are released automatically by the OS).
diff --git a/Misc/NEWS.d/next/Tests/2021-09-15-23-32-39.bpo-45209.55ntL5.rst b/Misc/NEWS.d/next/Tests/2021-09-15-23-32-39.bpo-45209.55ntL5.rst
@@ -0,0 +1,2 @@
+Fix ``UserWarning: resource_tracker`` warning in
+``_test_multiprocessing._TestSharedMemory.test_shared_memory_cleaned_after_process_termination``

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	+Fix ``UserWarning: resource_tracker`` warning in
	`2`	+``_test_multiprocessing._TestSharedMemory.test_shared_memory_cleaned_after_process_termination``