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Commit9a458be

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gh-91577: SharedMemory move imports out of methods (#91579)
SharedMemory.unlink() uses the unregister() function from resource_tracker. Previously it was imported in the method, but this can fail if the method is called during interpreter shutdown, for example when unlink is part of a __del__() method.Moving the import to the top of the file, means that the unregister() method is available during interpreter shutdown.The register call in SharedMemory.__init__() can also use this imported resource_tracker.
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‎Lib/multiprocessing/shared_memory.py‎

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@@ -23,6 +23,7 @@
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import_posixshmem
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_USE_POSIX=True
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from .importresource_tracker
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_O_CREX=os.O_CREAT|os.O_EXCL
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@@ -116,8 +117,7 @@ def __init__(self, name=None, create=False, size=0):
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self.unlink()
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raise
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from .resource_trackerimportregister
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register(self._name,"shared_memory")
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resource_tracker.register(self._name,"shared_memory")
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else:
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@@ -237,9 +237,8 @@ def unlink(self):
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called once (and only once) across all processes which have access
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to the shared memory block."""
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if_USE_POSIXandself._name:
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from .resource_trackerimportunregister
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_posixshmem.shm_unlink(self._name)
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unregister(self._name,"shared_memory")
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resource_tracker.unregister(self._name,"shared_memory")
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_encoding="utf8"
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Move imports in:class:`~multiprocessing.SharedMemory` methods to module level so that they can be executed late in python finalization.

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