Rust concurrency question. I want to store a

read_error_count: BTreeMap<String, usize>

field on

remote_cache::CommandRunner

. I think I want to wrap that in a

Mutex

? Iiuc, we only have one

CommandRunner

ever, but

run()

can be called by multiple different threads/tasks. I don't think I need an

Arc

because the type isn't being shared across different values?

The compiler will tell you right? That's the beauty here.

Great point, thanks for the reminder. Turns out, we need

Mutex<>

to be able to mutate, and then

Arc<>

so that it's cloneable.

Arc<Mutex<BTreeMap<String, usize>>>