问当在不同的线程上运行时，kotlin的演员是如何工作的？

EN

// The messages
sealed class CounterMsg
object IncCounter : CounterMsg() // one-way message to increment counter
class GetCounter(val response: CompletableDeferred<Int>) : CounterMsg() // a two-way message to get the counter

// The actor
fun CoroutineScope.counterActor() = actor<CounterMsg> { 
    var counter = 0 // actor state
    for (msg in channel) { // iterate over incoming messages
        when (msg) {
            is IncCounter -> counter++
            is GetCounter -> msg.response.complete(counter)
        }
    }
}

fun main() {
    runBlocking {
        val counterActor = counterActor()
        GlobalScope.massiveRun {
            counterActor.send(IncCounter) // run action 100000 times
        }
        val response = CompletableDeferred<Int>()
        counterActor.send(GetCounter(response))
        println("Counter = ${response.await()}")
        counterActor.close()
    }
}