Hi! Why is this coroutine here that uses Thread.sleep() not cancelled?

fun main() = runBlocking {

    val job = launch {
        repeat(5) { index ->
            println("operation number $index")
            ensureActive()
            Thread.sleep(100)
        }
    }
    delay(150)
    job.cancel()

}

you never suspend, and

runBlocking

is a single thread, so

job.cancel()

never runs until it's already finished

add a yield

yes, either replace

ensureActive()

with

yield()

, or

delay

instead of

Thread.sleep

, or use

<http://Dispatcher.IO|Dispatcher.IO>

-- any of these will solve the issue, and may be appropriate depending on what you're actually doing

Ahh,

ensureActive

is a not a

supend

function, whereas

yield()

is one 🤔