Why isn't this implementation in the standart library?

[rsofista]

By the README this lib rocks, and since it is so much faster than the std why isn't it there?

Just out of curiosity.

[faern]

An attempt was made to make std use this implementation. But it was ultimately abandoned/put on hold for a number of reasons. There were issues with certain platforms that did not handle time/sleeping very well (such as Wasm and SGX) and a large review of parking_lot yielded a number of issues that had to be addressed before it would be approved into std, and these things have not been fixed.

If you want to read a lot more you can dig deep into this PR: rust-lang/rust#56410

[daxpedda]

Note that the Std implementation has been overhauled in Rust v1.62.