Mutex with eventual fairness

[nxrighthere]

Hey, first of all, thanks for the collections, it works as intended!

Would you interested in implementation of mutex variation with support of eventual fairness similar to https://docs.rs/parking_lot/0.7.1/parking_lot/type.Mutex.html for example?

The goal is to ensure that the lock will be fair on average rather than immediate.

Something like:
yamc::eventual_fair::mutex
yamc::eventual_fair::recursive_mutex
yamc::eventual_fair::timed_mutex
yamc::eventual_fair::recursive_timed_mutex
yamc::eventual_fair::shared_mutex
yamc::eventual_fair::shared_timed_mutex
Would be great.

[yohhoy]

Ref. Locking in WebKit