parent_waits_for_its_children.kt

import kotlinx.coroutines.CoroutineName
import kotlinx.coroutines.delay
import kotlinx.coroutines.launch
import kotlinx.coroutines.runBlocking

fun main() = runBlocking {
    val request = launch(CoroutineName("request")) {
        repeat(3) { i ->
            launch {
                delay((i + 1) * 200L) // variable delay 200ms, 400ms, 600ms
                println("Coroutine $i is done")
            }
        }
        println("request: I'm done")
    }
    request.join()
    println("Processing of the request is complete")
}