René's URL Explorer Experiment

Title: gh-127266: avoid data races when updating type slots v2 by nascheme · Pull Request #133177 · python/cpython · GitHub

Open Graph Title: gh-127266: avoid data races when updating type slots v2 by nascheme · Pull Request #133177 · python/cpython

X Title: gh-127266: avoid data races when updating type slots v2 by nascheme · Pull Request #133177 · python/cpython

Description: This is an updated version of GH-131174, which was reverted. I figured the cleanest thing to do is make a new PR. This is the same as the previous PR with the following additional change. The update_all_slots() and type_setattro() functions are now more careful when the world is stopped. Instead of doing the MRO lookups while the world is stopped, we do them all first and collect the slot pointers to be updated. Then, we stop the world and do those updates. This makes it much easier to confirm the code running during the stop-the-world is safe and that should avoid the deadlocks. The test_opcache test has become quite a bit slower. It seems to be due to mutex contention in the __getitem__ and __getattribute__ method assignment tests. I reduced the items count from 1000 to 100 to keep the test from becoming much slower. Issue: gh-127266

Open Graph Description: This is an updated version of GH-131174, which was reverted. I figured the cleanest thing to do is make a new PR. This is the same as the previous PR with the following additional change. The upda...

X Description: This is an updated version of GH-131174, which was reverted. I figured the cleanest thing to do is make a new PR. This is the same as the previous PR with the following additional change. The upda...

Opengraph URL: https://github.com/python/cpython/pull/133177

X: @github

direct link

Domain: github.com

Links:

Viewport: width=device-width