Hi folks, there is any CoroutinesContextElement/Key that says when is running inside a `runBlocking`...

# coroutines

[SrSouza]

Hi folks, there is any CoroutinesContextElement/Key that says when is running inside a runBlocking ?

[diesieben07]

You would have to check if ContinuationInterceptor is an EventLoop, however that is an internal class.

[ephemient]

you could do a horrible hack like

runBlocking {
    coroutineContext[ContinuationInterceptor.Key]!!::class
        .allSuperclasses
    	.any { it.qualifiedName == "kotlinx.coroutines.EventLoop" }
}

but that is fragile. it'll yield false within runBlocking { withContext(Dispatchers.Unconfined) { } } but you're still effectively runBlocking, for example. what are you trying to do?

[SrSouza]

I'm working with a API that is low latency dependent and there is a Server Loop, we have a couple functions that use Mutex and in some cases we need to use runBlocking, launch a coroutines is not a choose in this cases, we also have a dispatcher that dispatches to this thread in the next Server Loop, the problem is when: we are on the Main Thread and we are using a runBlocking and some code tries to switch to this Main Thread Dispatcher, then, is causes a deadlock, this is predictable, what I want to do is have a log for when this cases happen because this cases usually happen. So by knowing that we are using runBlocking and we are trying to dispatch to this Main Thread I could get the stacktrace and print warning of the deadlock.

[ephemient]

how about checking Thread.currentThread() then?

[ephemient]

(or Looper on Android)