v3.5.3

This is the forty-eighth release in the Cats Effect 3.x lineage. It is fully binary compatible with every 3.x release and fully source-compatible with every 3.5.x release.

Warning

The 3.5.x series contains some changes that may be semantically breaking with respect to earlier 3.x releases. If you're using fs2, http4s, or other libraries from the ecosystem, make sure you've upgraded to versions of these libraries that are compatible with this release (for fs2, that's 3.7.0+, for http4s it's 0.23.19+)!

Additionally, if you're using methods like fromFuture, make sure you're aware of the major changes to async, described in these release notes.

What's Changed

Enhancements

• Optimize Dispatcher#unsafeRunAndForget by @kamilkloch in #3878
• Execute IO.blocking on WSTP without BlockContext indirection by @armanbilge in #3903
• Reset auto-cede counter after blocking by @armanbilge in #3938
• Remove unneeded notifyParked when worker transitions to blocking by @armanbilge in #3937
• Implement Fiber#join via asyncCheckAttempt by @armanbilge, @samspills in #3942

Bug Fixes

• Fix cancelation leak in fromFuture, fromFutureCancelable by @TimWSpence in #3892
• Fix #3898 for Dispatcher.parallel by @durban in #3900
• Immediately surface fatal errors in IO.raiseError by @scott-thomson239 in #3811
• Fix off-by-1 in CallbackStack#pack by @armanbilge in #3936
• Prevent Hotswap#get from acquiring a lock when there is no Resource present by @josgarmar28 in #3922
• Refactor CallbackStack based on new "pack locking" strategy by @armanbilge, @samspills, @mernst-github in #3943

Documentation

• Fix starvation demo app in tuning guide by @armanbilge in #3881
• Try to fix race condition in Hotswap example by @armanbilge in #3885
• Add note to starvation docs re: cpus in k8s by @Daenyth in #3750
• Add The Case For Effect Systems talk by @lenguyenthanh in #3905

Behind the Scenes

• Update versions for 3.5.2 by @armanbilge in #3857
• Release script improvements by @armanbilge in #3859
• Post release to Discord in CI by @armanbilge in #3855
• Tweak release notes config by @armanbilge, @samspills in #3951
• Decrease concurrency/replicas in CallbackStackSpec by @armanbilge, @samspills in #3952
• Update release.yml by @samspills in #3953
• Document release process by @armanbilge, @samspills in #3954

New Contributors

• @scott-thomson239 made their first contribution in #3811
• @josgarmar28 made their first contribution in #3922

Full Changelog: v3.5.2...v3.5.3