chore: prepare Tokio v1.13.1 #4235
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Depends on #4226 ## Motivation Currently, the safety invariants and synchronization strategy used in `tokio::sync::oneshot` are not particularly obvious, especially to a new reader. It would be nice to better document this code to make these invariants clearer. ## Solution This branch adds `SAFETY:` comments to the `oneshot` channel implementation. In particular, I've focused on documenting the invariants around when the inner `UnsafeCell` that stores the value can be accessed by the sender and receiver sides of the channel. I still want to take a closer look at when the waker cells can be set, and I'd like to add more documentation there in a follow-up branch. Signed-off-by: Eliza Weisman <eliza@buoyant.io>
Darksonn
approved these changes
Nov 15, 2021
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This backports #4226 and #4229 to
tokio-v1.13.xand prepares a release for v1.13.1.This should be rebase merged so that we have separate commits in the history for the backports and release prep.