How contented is new id allocation expected to be?

[terrarier2111]

There are a lot of possible optimizations on the way if we say that we expect low contention on the Mutex around ThreadIdManager, but can we make this assumption?

[Amanieu]

Contention should be low: it only happens once per thread, and the overhead is tiny compared to that of actually creating a thread.

[terrarier2111]

@Amanieu i opened a pr adjusting locking behavior in regards to this assumption

[ibraheemdev]

In general I don't see the need for any of the write paths to be optimized given how rarely they are taken. The performance characteristics of this library are perfectly fine as it is and any increased complexity seems like a bad tradeoff.