Loop heavy blocking process without UI freeze

LoopBlockingWithoutFreeze.kt

fun main() {
    val h = Handler(Looper.getMainLooper())
    GlobalScope.launch(Dispatchers.Main) {
        (1..5).forEach { proc(it, h) }
    }
    h.removeCallbacksAndMessages(null)
}

suspend fun proc(no: Int, h: Handler): Boolean = suspendCoroutine {
    h.post {
        Thread.sleep(1_000) // <-- heavy blocking process
        tvStatus.text = "process #$num"
        it.resume(true)
    }
}