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kotlinlang

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

I am just being cautious not to block 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 :smile:

guess I would do an implementation with `Mutex` then :stuck_out_tongue:

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.