private val termination = CountDownLatch(1)
private val scope = dispatcher + Job().apply {
    thread {
        // use non-dameon thread to keep application alive until all tasks completed.
        termination.await()
        while (children.any { it.isActive }) Thread.sleep(50)
    }
}

fun shutdown() {
    termination.countDown()
}

val scope : CoroutineScope = ...
fun main() = {
  val job = scope.launch { ... do all my tasks within this coroutine ... }
  runBlocking { job.join() }
}

runBlocking { job.join() }

while (children....) { ... }

job

Job()

Job()

runBlocking {
 scope.coroutineContext[Job]!!.children.toList().joinAll()
}

join()

fun main() {
    val parentJob = Job()
    val scope = CoroutineScope(<http://Dispatchers.IO|Dispatchers.IO> + parentJob)

    println("Start")

    val job = scope.launch {
        launch { delay(1000) }
        launch { delay(2000) }
        launch { delay(2000) }
        launch { delay(2000) }
        launch { delay(2000) }
        launch { delay(2000) }
        launch { delay(2000) }
        launch { delay(2000) }
        launch { delay(2000) }
    }
    runBlocking { parentJob.children.toList().joinAll() }

    println("Done")
}

parentJob

job

runBlocking { ... }

channel to be closed when the parent job completes or gets cancelled