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Description
SharedMemory.unlink() contains aimport which can fail if called during interpreter shutdown.
For example when working with SharedMemory as the buffer for a numpy array it is useful to create a wrapper object to ensure that clean up is done with the object is deleted.
#import numpy as npfrommultiprocessingimportshared_memoryclassShArray:def__init__(self):self.shared_memory=shared_memory.SharedMemory(create=True,size=400)#self.array = np.ndarray((10,10), dtype="i4", buffer=self.shared_memory.buf)def__del__(self):self.shared_memory.close()self.shared_memory.unlink()a1=ShArray()
(Commented lines show my typical usage, but are not need to demonstrate the issue)
Exception ignored in: <function ShArray.__del__ at 0x7f36eee510d0>Traceback (most recent call last): File "/home/sam/git/cpython/test_shared_mem2.py", line 13, in __del__ File "/home/sam/git/cpython/Lib/multiprocessing/shared_memory.py", line 240, in unlinkImportError: sys.meta_path is None, Python is likely shutting down/home/sam/git/cpython/Lib/multiprocessing/resource_tracker.py:224: UserWarning: resource_tracker: There appear to be 1 leaked shared_memory objects to clean up at shutdown warnings.warn('resource_tracker: There appear to be %d 'This happens on 3.8 and current main, both on Linux x86-64.
Patch to follow