Can someone explain me what's happening here? :thread: Thank you!

# coroutines

[Karan Sharma]

Can someone explain me what's happening here? 🧵 Thank you!

[Karan Sharma]

Scenario 1 - When the exception happens in the first coroutine i.e Job1, does it also cancel the scope ?
The join will make sure that execution is sequential, therefore, understood that job2 coroutine should be executed after job1 completes. but it does not even launch a coroutine

[Karan Sharma]

Scenario 2 - In this scenario, if I remove the join and make this parallel execution., the exception is not printed at all. why is that?

[Patrick Steiger]

1 - A failure of the child cancels the parent scope (if not supervisor), yes. So this scope can’t be used anymore to launch new coroutines — it’s cancelled.
2 - Probably main finishes before throwing the exception, since it’s not under structured concurrency (myScope is not a child of the `runBlocking`scope).

[Karan Sharma]

1. yes that makes sense! thanks

[Karan Sharma]

2. hmmm, yea looks like main finishes, before the coroutine has completed.