[pull] main from facebook:main #340
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Summary: `folly/coro/safe/` is one of the directories opted-in to the SPELL lint, but `typos` has found an additional issue in this directory. Fix it :) Reviewed By: Orvid Differential Revision: D76420969 fbshipit-source-id: 2ef012b9e6804d906772cf00d2996ccf6d2c8810
Summary: accessAllThreads needs to acquire several locks to keep the state of the TL object being iterated stable across all threads during the lifetime of the Accessor. The StaticMeta::lock_ prevents a thread's element array from being reallocated due to it updating some, potentially unrelated, TL object. The Accessor needs to read the element ptr from each thread's ThreadEntry element array. The ThreadEntrySet for the TL object being iterated is also locked to prevent any thread from altering the element it has for that TL object while the Accessor is alive. By caching the element ptr in the ThreadEntrySet, we eliminate the need for the Accessor to rely on `elements` array in ThreadEntry and hence the need to acquire StaticMeta's lock_. Besides simplifying the interactions between different parts of the implementation, this change will also prevent false blocking of threads that want to update TL object unrelated to the Accessor. It opens the path to moving the element deleter info to ThreadEntrySet and further reduce per element memory overheads. Reviewed By: yfeldblum Differential Revision: D76320828 fbshipit-source-id: 24065a1a24fd45a73248bc40a0cf5e6f8000ba49
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