How to write coroutines efficiently - 2

good_coroutine_usage2.kt

suspend fun performBlockingOperationSuspended(jobName: String) {
    //  non-blocking delay - delay() is a suspending function un-like Thread.sleep()
    delay(1000)
    println("Blocking operation completed. jobName = $jobName, thread : ${Thread.currentThread().name}")
}

fun main() = runBlocking {
    val executionTime = measureTimeMillis {
        val job1 = launch {
            performBlockingOperationSuspended("job1")
        }
        val job2 = launch {
            performBlockingOperationSuspended("job2")
        }
        val job3 = launch {
            performBlockingOperationSuspended("job3")
        }
        println("Coroutine launched")
        joinAll(job1, job2, job3)
    }
    println("Total execution time: $executionTime ms")
}

/*
Console Output:
Coroutine launched
Blocking operation completed. jobName = job1, thread : main
Blocking operation completed. jobName = job2, thread : main
Blocking operation completed. jobName = job3, thread : main
Total execution time: 1016 ms
*/