It is Ok, but under high load (lots of CPUs, lots of ops)

ConcurrentHashMap

is better.

elizarov: Will synchronized (mutex) {...} block a thread or will it prempt a coroutine

synchornized

blocks a thread. There is a

Mutex

for coroutines with suspending

lock

.

So it is bad to use

synchronized

stuff in coroutines then 😄

It would be interesting to look at. The anecdotal practice so far is that you can always find a solution to a problem at hand that does not use any kind of mutex or synchronization.

Ya, I am already trying to see if there is a coroutine friendly dictionary implemented already. I once did it for C# making an LRU cache that was

Task

friendly. Hope I don't have to do it myself here.

What you need to be able to do with it?