Hi guys I m writing a multiplatform app with network calls a

Question

Hi guys I m writing a multiplatform app with network calls and coroutines I have basically two Coroutine Dispatchers one for main and one for i o operations On Android these are defined as Dispatchers Main and <http Dispatchers IO|Dispatchers IO> On iOS though I ve implemented what I ve seen on many projects tutorials online a custom `dispatch queue` dispatcher that takes a native dispatch queue and calls a `dispatch async ` on it The tutorials I ve seen though they use the same dispatch queue for running every operation the main dispatch queue Indeed if I try to create a new dispatch queue for network a new thread it says it can t run stuff in it because it can t use a non blocked or shared object on a different thread Questions 1 Is there a way to create two threads for two dispatchers and use them with coroutines in Kotlin MPP I think not since I m seeing that there s an issue filed for it 2 How bad is running network and UI in the same thread but asyncronously 3 Are there some limitations for this

kpgalligan · Answer

1 No

kpgalligan · Answer

2 That s what ktor does

kpgalligan · Answer

Network calls are async and coroutine continues in main thread when async call completes

alexfacciorusso · Answer

Thank you very much now I m relieved about it sweat smile

kpgalligan · Answer

3 For async and continue No real limitation other than managing your own async I have a pending blog post about this

kpgalligan · Answer

I have a simple suspend function here <https github com touchlab DroidconKotlin blob master sessionize lib src commonMain kotlin co touchlab sessionize platform Functions kt L13>

kpgalligan · Answer

You call that from the main thread give it a lambda which will be frozen so be careful and it ll suspend and run that in a background thread When complete it ll continue in the main thread

kpgalligan · Answer

Have another threading mechanism here Listens for db updates here <https github com touchlab DroidconKotlin blob master sessionize lib src commonMain kotlin co touchlab sessionize platform Functions kt L13>

kpgalligan · Answer

Pushes to main thread here <https github com touchlab DroidconKotlin blob master sessionize lib src commonMain kotlin co touchlab sessionize architecture MainThreadPubSub kt>

kpgalligan · Answer

All of this goes away when multithreaded coroutines happen

kpgalligan · Answer

First 2 parts of threading series while we re talking about it <https medium com kpgalligan kotlin native stranger threads ep 1 1ccccdfe0c99>

alexfacciorusso · Answer

That s very nice looking forward to reading the new article when you ll finish it grin