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#multiplatform
Title
# multiplatform
r
Rak
06/17/2021, 10:06 AMI came across an article talking about the concurrency model and it talks about freeze(). I tried to run the code but the IDE does not recognise the freeze() method. What am I doing wrong? https://play.kotlinlang.org/hands-on/Kotlin%20Native%20Concurrency/02_Frozen
t
Tiago Nunes
06/17/2021, 10:26 AMfreeze is only available in native source sets (e.g. iosMain)
r
Rak
06/17/2021, 10:46 AMMy project is refusing to work with iOS, do you know if I create Kotlin code that “breaks the rules” in some way to do with mutable state, it will crash iOS?
even if I don’t reference those classes in iOS?
t
Tiago Nunes
06/17/2021, 10:50 AMHm if you don't reference it in iOS it shouldn't be a problem. Illegal mutable state sharing only results in runtime crashes at the time it's invoked
r
Rak
06/17/2021, 10:52 AMany resources for writing the kotlin code in such a way as to not hit the “rules”?
r
Rak
06/17/2021, 10:56 AMI followed some jetbrain tutorial a showing how to make a network request
it worked but when i tried to write my own code to do something similar it worked fine on android but i got errors in iOS
doesn’t help that my iOS knowldesge is zero
t
Tiago Nunes
06/17/2021, 10:58 AMI don't know much either, thankfully my collegues can help me
What were these errors? Maybe I can help
r
Rak
06/17/2021, 11:00 AMthat would be great, give me a sec
06-17 120230.018 💜 VERBOSE HTTP Client - RESPONSE https://gitcdn.link/cdn/KaterinaPetrova/greeting/7d47a42fc8d28820387ac7f4aaf36d69e434adc1/greetings.json failed with exception: kotlin.native.concurrent.InvalidMutabilityException: mutation attempt of frozen kotlin.collections.HashMap@cc0428
t
Tiago Nunes
06/17/2021, 11:03 AMYou're using Ktor?
r
Rak
06/17/2021, 11:03 AMhere’s the source code for the shared kotlin code being called from iOS
whats strange is that this all worked at one point
I started adding more kotlin code and tested on android
all worked but whn i tried on iOS i got these errors, even when i stopped refrencing my code and went back to the sample
yes Ktor
i just checked out the sample project from github (my initial project was written manually)
t
Tiago Nunes
06/17/2021, 11:11 AMMight be a problem with your dependencies
r
Rak
06/17/2021, 11:12 AMhmm, but KMM can use coroutines
and the sample did work
t
Tiago Nunes
06/17/2021, 11:15 AMAre you using any libraries that the sample doesn't use?
r
Rak
06/17/2021, 11:15 AMi added kotlinx serialisation
I’m going to build my app bit by bit and see when it started to fail
t
Tiago Nunes
06/17/2021, 11:19 AMTry adding this to commonMain:
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implementation ("org.jetbrains.kotlinx:kotlinx-coroutines-core"){
version {
strictly("1.5.0-native-mt")
}
}r
Rak
06/17/2021, 11:25 AMso commonMain has no depndecy on coroutines
but the androidTest section has implementation(“org.jetbrains.kotlinxkotlinx coroutines test1.5.0”)
the android app has a dependency to:
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implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:$coroutinesVersion")t
Tiago Nunes
06/17/2021, 11:28 AMTry using the mt version
r
Rak
06/17/2021, 11:28 AMbut when i add what you suggested to commonMain
Cannot find a version of ‘org.jetbrains.kotlinx:kotlinx-coroutines-core’ that satisfies the version constraints:
Dependency path ‘PocKMMandroidAppPocunspecified’ --> ‘org.jetbrains.kotlinxkotlinx coroutines core1.5.0’
t
Tiago Nunes
06/17/2021, 11:28 AMWhen using other libraries that also depend on, such as Ktor, make sure to specify the multithreaded version ofkotlinx.coroutineskotlinx-coroutines
r
Rak
06/17/2021, 11:29 AMwhere did you get that from?
t
Tiago Nunes
06/17/2021, 11:29 AMr
Rak
06/17/2021, 11:30 AMthanks!
t
Tiago Nunes
06/17/2021, 12:22 PMDid it solve your problem?
r
Rak
06/17/2021, 10:18 PMunfortunately not
but thanks anyway