Is it possible to share a HashMap between threads without locking the entire HashMap?

Question

I would like to have a shared struct between threads. The struct has many fields that are never modified and a HashMap, which is. I don\'t want to lock the whole

Answer 1

Maybe you want to consider rust-evmap:

A lock-free, eventually consistent, concurrent multi-value map.

The trade-off is eventual-consistency: Readers do not see changes until the writer refreshes the map. A refresh is atomic and the writer decides when to do it and expose new data to the readers.