Coroutines are cheaper than threads!

coroutines.kt

import kotlinx.coroutines.experimental.CoroutineName
import kotlinx.coroutines.experimental.async
import kotlinx.coroutines.experimental.delay
import java.text.SimpleDateFormat
import java.util.*

/**
 * Coroutines are cheaper than threads!
 */
fun main(args: Array<String>) {
    for (i in 1..1_000_000) {
        async(CoroutineName("UseCase")) {
            log("atomicInteger1: " + atomicInteger1.addAndGet(i).toString())
            log("atomicInteger2: " + atomicInteger2.addAndGet(i).toString())
            log("atomicInteger3: " + atomicInteger3.addAndGet(i).toString())
            delay(1000L) // the resulting program won't run for 1,000,000 seconds (over 11.5 days)!
        }
    }
}

/** Custom logger */
private fun log(msg: String) {
    val sdf = SimpleDateFormat("hh:mm:ss:ms", Locale.getDefault())
    val currentTime = sdf.format(Date())

    println("[${"'Work in thread " + Thread.currentThread().name + "; Time: " + currentTime}]   value: $msg")
}