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So I finished the Coroutines - Hands on course <https://play.kotlinlang.org/hands-on/Introduction%20to%20Coroutines%20and%20Channels/05_Concurrency>
And the thing I don't understand is this
```To run the coroutine only on the main UI thread, we should specify Dispatchers.Main as an argument:
launch(Dispatchers.Main) {
    updateResults()
}```
I would have expected `Dispatchers.Swing` to be used here, it is available in the course's setup.
So a) under which circumstances is `Dispatchers.Main` equal to `Dispatchers.Swing` and
b) If I want to use a Dispatcher backed by a single Thread (to avoid concurrent access on some unsychronized code), if I'm in a situation where  `Dispatchers.Main` is equal to `Dispatchers.Swing` , and I don't want to use the UI-Thread to be responsible, which Dispatcher do I use instead? (AFAIK `Dispatchers.Default` is backed by as many threads as the computer has Hyperthreads and `<http://Dispatchers.IO|Dispatchers.IO>` is very specific as well.) Is there something better than `Executors.newSingleThreadExecutor().asCoroutineDispatcher()` ?
c) assuming I'm not on the JVM (and using `Executors` is therefore not an option), what's the Kotlin Multiplatform solution to create your own `CoroutineDispatcher` with a specific thread-count?

Hi you can refer this blog I think this might clear your doubt

<https://blog.mindorks.com/mastering-kotlin-coroutines-in-android-step-by-step-guide>

a) You generally don’t need to worry about that. `Dispatchers.Main` will be automatically set to whatever is appropriate for the UI framework you’re using. On the JVM, I believe it’s done via service loader (so if you depend on the swing support artifact, it will be bound to Swing)

b) If you want to avoid concurrent access in coroutines, don’t create a separate dispatcher, just use a `Mutex`, a `Semaphore`, or another technique that limits concurrency (like actors).

c) Multi-threaded coroutines on kotlin native is a work-in-progress without an ETA. There is a draft PR up for support here: <https://github.com/Kotlin/kotlinx.coroutines/pull/1648>

<@U01326EE89X> I don’t work on Android at all. Currently on JVM and maybe Multiplatform in the future.
<@U0KMMQA20> sounds good, thanks