bpo-43468: Per instance locking for functools.cached_property #27609
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rhettinger wants to merge 16 commits intopython:mainfrom
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bpo-43468: Per instance locking for functools.cached_property #27609rhettinger wants to merge 16 commits intopython:mainfrom
rhettinger wants to merge 16 commits intopython:mainfrom
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It looks like |
ambv
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Aug 17, 2021
| # import types, weakref # Deferred to single_dispatch() | ||
| from reprlib import recursive_repr | ||
| from _thread import RLock | ||
| from threading import RLock, Condition, get_ident |
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This change introduces an import cycle which causes tests to fail.
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There is a race condition on 980-983.
Scenario:
- 3 threads, 1 registered in
updaters - 2nd and 3rd will wait
- both waiting threads will see registration of registered thread disappear
Mutual exclusion breaks.
ptmcg
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Aug 27, 2021
Misc/NEWS.d/next/Library/2021-08-04-18-30-25.bpo-43468.PlU--J.rst
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Can someone confirm or deny if my solution on twitter works?
I also made a PR here: rhettinger#7 |
candidate fix for deadlock
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Draft PR. It needs a NEWS entry, perhaps more tests, and perhaps some more factoring.
https://bugs.python.org/issue43468