I want to create a Dispatcher that limits concurrency to 1, but I don’t want the expense of creating a new thread dispatcher. Is there a way to create a limited concurrency dispatcher from the Default dispatcher?

There is no way (no API) for now to create a new dispatchere that reuses threads from IO or Default thread pool, only create a new thread pool and convert it to dispatcher

Maybe this isn’t the right thing, so any advice would be appreciated! I have a resource I want to access from a coroutine, but I want to make sure I don’t interact with that resource from more than one coroutine at a time. I realize I’m describing a lock, but I don’t think that’s the right primitive in coroutines. Thoughts?

There is non-bloking Mutex in coroutines: https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines.sync/-mutex/

Noted! Mutex seems like a good solution for part of what I’m doing. Thanks! I may come back tomorrow with some sample code, after I think so more about the other part. Thanks again!

@basher Curious what's your use-case. DB transactions?

You can do Executors.newSingleThread...().asDispatcher() or sth alike

talking about about db transactions yes, but i've recently realized it's moot

You can do Executors.newSingleThread...().asDispatcher() or sth alike

It's true, but in most cases it's just not needed Also it easy to leak thread (such exector should be explicitly closed to solve problem of leaked thread) Also it will not work with non-blocking APIs