Why `runBlocking` starts by default on a thread named "main" instead of using `Dispatchers.Default`?...

# coroutines

[marcinmoskala]

Why runBlocking starts by default on a thread named "main" instead of using Dispatchers.Default?

fun main() = runBlocking() {
    print(Thread.currentThread().name) // main
}

fun main() = runBlocking(Dispatchers.Default) {
    print(Thread.currentThread().name) // DefaultDispatcher-worker-1
}

[Jacques Smuts]

It runs on the current thread you are on when you call it.

[Marko Mitic]

As the name says, it doesn't launch, it runs

[marcinmoskala]

@Marko Mitic This sounds convincing

[kingsley]

On the other hand suspend fun main() {} actually does run on the default dispatcher

[marcinmoskala]

This is the point, like AFAIK everything else

suspend fun main() = coroutineScope<Unit> {
    launch {
        print(Thread.currentThread().name) // DefaultDispatcher-worker-1
    }
}

suspend fun main() {
    GlobalScope.launch {
        print(Thread.currentThread().name) // DefaultDispatcher-worker-1
    }.join()
}