So, I have a list of tasks that I need to run based on their priority when the android app is launched. I would like to make the Main Thread wait the finish of these tasks execution, but I would like to delegate the execution to background threads....

runBlocking(Dispatchers.Main.immediate) {
    initialize(application)
}

suspend fun initialize(app: Application) = coroutineScope {
    registry.groupBy { initializer ->
        initializer.priority().ordinal
    }
        .toSortedMap()
        .forEach { entry ->
            val tasks = entry.value.map { initializer ->
                async {
                    initializer.initialize(app)
                }
            }
            tasks.awaitAll()
        }
}

The code above runs, but if I change

async {

to

async(Dispatchers.Default) {

Makes the app blocks forever. Would anyone have an idea of how to fix it ?