Commits on Jul 18, 2024

1. Implemented various backoffs and per-CPU rng …

   1. Modified crates/spinlock to provide support for multiple backoff strategies
   when encountering lock contention, including exp-backoff.
   
   2. Modified `BaseSpinLock` in crates/spinlock to support locking with a
   different guard/backoff type, providing more flexibility.
   
   3. Added a new module `ruxrand` that aims to provide support for the usage
   of RNGs inside kernel. Currently a per-CPU RNG and support for rand-exp-backoff
   are implemented.
   
   4. Changed the lock type used by `RunQueue`.

   

   Sssssaltyfish committed Jul 18, 2024
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