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Turn calls of __traverse__ into no-ops for unsendable pyclass if on the wrong thread Adds a "threadsafe" variant of `PyCell::try_borrow` which will fail instead of panicking if called on the wrong thread and use it in `call_traverse` to turn GC traversals of unsendable pyclasses into no-ops if on the wrong thread. This can imply leaking the underlying resource if the originator thread has already exited so that the GC will never run there again, but it does avoid hard aborts as we cannot raise an exception from within `call_traverse`.

2023-12-22 11:01:40 +00:00

Calls to `__traverse__` become no-ops for unsendable pyclasses if on the wrong thread, thereby avoiding hard aborts at the cost of potential leakage.