Coroutine Async

Main.kt

lifecycleScope.launch(Dispatchers.IO) {
            val start = Instant.now().epochSecond
            println(">>> ${Instant.now().epochSecond}")
            val def1 = async { async1() }
            val def2 = async { async2() }
            println(">>> ${def1.await()} ${def2.await()}")
            println(">>> ${Instant.now().epochSecond - start}")  //3
        }
lifecycleScope.launch() {
            val start = Instant.now().epochSecond
            println(">>> ${Instant.now().epochSecond}")
            val def1 = async { async1() }
            val def2 = async { async2() }
            println(">>> ${def1.await()} ${def2.await()}")
            println(">>> ${Instant.now().epochSecond - start}")  //6
        }
lifecycleScope.launch(Dispatchers.Main) {
            val start = Instant.now().epochSecond
            println(">>> ${Instant.now().epochSecond}")
            val def1 = async { async1() }
            val def2 = async { async2() }
            println(">>> ${def1.await()} ${def2.await()}")
            println(">>> ${Instant.now().epochSecond - start}")  //6
        }
lifecycleScope.launch(Dispatchers.Unconfined) {
            val start = Instant.now().epochSecond
            println(">>> ${Instant.now().epochSecond}")
            val def1 = async { async1() }
            val def2 = async { async2() }
            println(">>> ${def1.await()} ${def2.await()}")
            println(">>> ${Instant.now().epochSecond - start}") //6
        }

private fun async1(): Thread {
        Thread.sleep(3 * 1000)
        return Thread.currentThread()
    }

private fun async2(): Thread {
        Thread.sleep(3 * 1000)
        return Thread.currentThread()
    }