Tracking Issue for rwlock-try-upgrade

[ShrigmaDev]

This is a tracking issue for the RFC "Add Rwlock try_upgrade method" (link).
The feature gate for the issue is #![feature(rwlock_try_upgrade)].

TODO:

• ACP: Add Rwlock try_upgrade method libs-team#514
• Implementation: Rwlock try upgrade #138560
  • futex.rs
  • no_threads.rs
  • queue.rs
  • solid.rs
  • teeos.rs
• Stabilization PR ([see instructions on rustc-dev-guide][stabilization-guide])

Unresolved Questions