Disable shm resource tracker via flag on 3.13+

As per the newly added support,
https://docs.python.org/3/library/multiprocessing.shared_memory.html

tractor/ipc/_mp_bs.py

@@ -17,36 +17,59 @@
 Utils to tame mp non-SC madeness
 
 '''
+import platform
+
 
-# !TODO! in 3.13 this can be disabled (the-same/similarly) using
-# a flag,
-# - [ ] soo if it works like this, drop this module entirely for
-#   3.13+ B)
-#  |_https://docs.python.org/3/library/multiprocessing.shared_memory.html
-#
 def disable_mantracker():
     '''
     Disable all `multiprocessing` "resource tracking" machinery since
     it's an absolute multi-threaded mess of non-SC madness.
 
     '''
-    from multiprocessing import resource_tracker as mantracker
+    from multiprocessing.shared_memory import SharedMemory
 
-    # Tell the "resource tracker" thing to fuck off.
-    class ManTracker(mantracker.ResourceTracker):
-        def register(self, name, rtype):
-            pass
 
-        def unregister(self, name, rtype):
+    # 3.13+ only.. can pass `track=False` to disable
-            pass
+    # all the resource tracker bs.
+    # https://docs.python.org/3/library/multiprocessing.shared_memory.html
+    if (_py_313 := (
+            platform.python_version_tuple()[:-1]
+            >=
+            ('3', '13')
+        )
+    ):
+        from functools import partial
+        return partial(
+            SharedMemory,
+            track=False,
+        )
 
-        def ensure_running(self):
+    # !TODO, once we drop 3.12- we can obvi remove all this!
-            pass
+    else:
+        from multiprocessing import (
+            resource_tracker as mantracker,
+        )
 
-    # "know your land and know your prey"
+        # Tell the "resource tracker" thing to fuck off.
-    # https://www.dailymotion.com/video/x6ozzco
+        class ManTracker(mantracker.ResourceTracker):
-    mantracker._resource_tracker = ManTracker()
+            def register(self, name, rtype):
-    mantracker.register = mantracker._resource_tracker.register
+                pass
-    mantracker.ensure_running = mantracker._resource_tracker.ensure_running
+
-    mantracker.unregister = mantracker._resource_tracker.unregister
+            def unregister(self, name, rtype):
-    mantracker.getfd = mantracker._resource_tracker.getfd
+                pass
+
+            def ensure_running(self):
+                pass
+
+        # "know your land and know your prey"
+        # https://www.dailymotion.com/video/x6ozzco
+        mantracker._resource_tracker = ManTracker()
+        mantracker.register = mantracker._resource_tracker.register
+        mantracker.ensure_running = mantracker._resource_tracker.ensure_running
+        mantracker.unregister = mantracker._resource_tracker.unregister
+        mantracker.getfd = mantracker._resource_tracker.getfd
+
+        # use std type verbatim
+        shmT = SharedMemory
+
+    return shmT

tractor/ipc/_shm.py

@@ -23,14 +23,15 @@ considered optional within the context of this runtime-library.
 
 """
 from __future__ import annotations
+from multiprocessing import shared_memory as shm
+from multiprocessing.shared_memory import (
+    # SharedMemory,
+    ShareableList,
+)
+import platform
 from sys import byteorder
 import time
 from typing import Optional
-from multiprocessing import shared_memory as shm
-from multiprocessing.shared_memory import (
-    SharedMemory,
-    ShareableList,
-)
 
 from msgspec import (
     Struct,
@@ -61,7 +62,7 @@ except ImportError:
 log = get_logger(__name__)
 
 
-disable_mantracker()
+SharedMemory = disable_mantracker()
 
 
 class SharedInt:
@@ -797,8 +798,15 @@ def open_shm_list(
     # "close" attached shm on actor teardown
     try:
         actor = tractor.current_actor()
+
         actor.lifetime_stack.callback(shml.shm.close)
-        actor.lifetime_stack.callback(shml.shm.unlink)
+
+        # XXX on 3.13+ we don't need to call this?
+        # -> bc we pass `track=False` for `SharedMemeory` orr?
+        if (
+            platform.python_version_tuple()[:-1] < ('3', '13')
+        ):
+            actor.lifetime_stack.callback(shml.shm.unlink)
     except RuntimeError:
         log.warning('tractor runtime not active, skipping teardown steps')