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> You would need to call memory_release(). Perhaps we can just expose it on the
> C-API level as PyMemoryView_Release().
Should PyMemoryView_Release() release the _PyManagedBufferObject by doing mbuf_release(view->mbuf) even if view->mbuf->exports > 0?
Doing
 Py_TYPE(view->mbuf)->tp_clear((PyObject *)view->mbuf);
seems to have the desired effect of causing ValueError when I try to access any associated memoryview.
> 3) A piece of memory needs to be packaged as a memoryview with automatic
> cleanup in mbuf_dealloc():
>
> PyMemoryView_FromBufferWithCleanup() (proposed in msg169613)
Maybe this should also handle decrefing the base object (given a flag PyManagedBuffer_FreeObj). I do worry about creating memoryviews that survive deallocation of the base object.