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Is having a reentrant readwrite lock an anitpattern in a reactive stack?
Does it make sense to wrap it into a coroutines? 

There is no reentrant lock in coroutines right now. You should probably follow semaphore development.

I mean I’ve a component that contains a read/write lock and get’s called by a suspended function

Java reentrant lock is blocking. If you are using blocking io, you can use it, but you won't get benifits from coroutines. You should remember to use `<http://Dispatchers.IO|Dispatchers.IO>` though not to block the pool. If you are using NIO, you should try to rewrite your code to avoid the lock entirely, or use coroutines Mutex.