Anyone know of a multiplatform alternative to workmanager? I'm looking for a way to schedule data update tasks so that my app can work offline.

I have a project that builds to linux for x11 and wayland. Each of those need different cinterop library definitions. So i thought it's a good idea to split each c library into its own definition file, so i could cherry pick what i need for each target. Like i'd have one

xcb.def

(used for x11), one

cairo.def

(used for both x11 and wayland), and a

pango.def

(also used for both targets). The issue is that a part of the cairo library (which i will extract into its own def file), links against xcb. So if i create its own file for this, the package will be a different one, and in code, i end up with 2 interop types in different packages which are basically the same. So a function from the cairo package might require

cairo.xcb_visualtype_t

instead of a

xcb.xcb_visualtype_t

and i have no idea how to tell it that it should use the one from the xcb namespace instead. There is probably a really easy way to solve this, but i don't know how yet, and the documentations didn't push me in the right direction.

Just wondering if the Kotlin Compiler (with Kotlin 1.4.31) Smart Casting topicPtr into a non null one is correct behaviour? Below is some sample code:

import kotlinx.cinterop.*
import platform.linux.free
import platform.linux.malloc

fun main() {
    var topicPtr = malloc(8uL * 5uL)?.reinterpret<ByteVar>()
    topicPtr?.set(0, '/'.toByte())
    topicPtr?.set(1, 't'.toByte())
    topicPtr?.set(2, 'e'.toByte())
    topicPtr?.set(3, 's'.toByte())
    topicPtr?.set(4, 't'.toByte())
    println("Topic: ${topicPtr?.toKString()}")
    free(topicPtr)
    topicPtr = null
    // Smart Casting occurs here.
    free(topicPtr)
    println("Exiting...")
}

This obscure runtime error appears, and I don't know why this error is appearing:

Uncaught Kotlin exception: kotlin.native.IncorrectDereferenceException: Trying to access top level value not marked as @ThreadLocal or @SharedImmutable from non-main thread
    at ThrowIncorrectDereferenceException (0x28742c)
    at  (0x32cda1)
    at Kotlin_initRuntimeIfNeeded (0x33cd7b)
    at _636f6d2e636861706d616e3a626f6c742d646174612d636f6e73756d6572_kncfun78 (0x32e26c)
    at MQTTClient_run (0x347173)
    at  (0x7fd0e85d86db)
    at clone (0x7fd0e80e9a3f)
    at  ((nil))

What are the pitfalls/catches of calling the initRuntimeIfNeeded function?

Anyone have an automated way (plugin or lint rule?) to enforce that public methods are either • annotated with @Throws for iOS, or • intentionally not annotated (either with an ignore, or maybe a different annotation)? We aggressively use `check`/`require` to validate method inputs, and it’s a pain when we encounter it and don't get a catchable exception on iOS 😅

This message was deleted.

Are the internals of the Kotlin/Native compiler documented anywhere? Specifically the .knt, .knb, .knf, .knd and .knm formats which are produced when running

-p library

.

Would also love pointers for dynamically linking the stdlib if possible. Thanks in advance

Hello, I am trying to use the Stately's Isolate Collections library. However when I'm trying to iterate over an IsoMutableMap, then I get crash saying UnsupportedOperationException("Can't leak mutable reference"). In the IsoMutableMap.kt, this operations is blocked as below. Can someone share why 'entries' can leak mutable reference but not the 'values'? Also, Is there any other way to iterate over the entry set?

override val entries: MutableSet<MutableMap.MutableEntry<K, V>>
    get() {
        throw UnsupportedOperationException("Can't leak mutable reference")
        // access { IsoMutableSet(fork(it.entries)) }
    }

Thanks!

In kotlin/native, how would I create a frozen reference to a mutable object to read changes across threads? Basically, my front-end is a block editor similar to the Unreal Event Editor, and the back-end has a thread using the configuration from that editor in real-time. However, I can't use the MutableList of nodes I have since either it's not frozen and can't be shared, or it's frozen but then the front-end can't make any changes. I also considered stopping and restarting the backend thread, but since a frozen object can't be un-frozen, that's also not an option. I've tried doing some more hacky stuff with creating a COpaquePointer and pulling it from that, to avoid it from being frozen, but that still made the object exist in two threads and crash. I'd really like to know how to solve this, since I much prefer kotlin over C++ (where I did get this concept working).

Also, how should I go about debugging? the one built into IJ with the gradle task doesn't really catch any errors...

Alternatively, if someone could explain what's wrong:

kotlin
abstract class Node {
    abstract fun process()
    abstract fun cleanup()
    abstract val inputs: Map<String, CArrayPointer<FloatVar>>
    abstract val outputs: List<String>

    fun connect(output: String, receivingNode: Node, input: String) {
        if (!outputs.contains(output)) {
            throw IllegalArgumentException("Unknown node output name! (Connecting ${this::class.simpleName}.$output to ${receivingNode::class.simpleName}.$input)")
        }
        val new = mutableMapOf<String, CArrayPointer<FloatVar>>().also {
            it.putAll(this.connections.value)
            it[output] = receivingNode.getInputBuffer(input)
        }
        this.connections.value = new
    }

    fun getOutputBuffer(name: String) : CArrayPointer<FloatVar>? = connections.value[name]

    /* internals below */

    private val connections = AtomicReference(mapOf<String, CArrayPointer<FloatVar>>())
    private fun getInputBuffer(name: String) : CArrayPointer<FloatVar> = inputs[name] ?: throw IllegalArgumentException("Unknown node input name! (${this::class.simpleName}.$name)");
}

For some reason somewhere in

connect

, it throws an error because a map that is supposedly already frozen gets modified, but I don't see where that happens.

I'm also interested in how these thread-safety features cause an impact on performance, as my application mostly interacts with live audio, and using mutexes or similar to sync threads is not a viable solution to keep up with performance.

Is there a dev build of IDEA kotlin plugin with cinterops commonizer support somewhere out there? Everything builds fine with kotlinc dev build I'm using, but idea is unable to recognize my cinterops in intermediate sourceSet

How should I deal with resource cleanup on interrupt signals? I had a look at https://dev.to/mreichelt/handling-sigint-in-kotlin-native-2ac6 but it seems like a staticCFunction can't take local variables to stop the loop or similar.

var loop = true
        // TODO: Make this compatible with windows
        signal(SIGINT, staticCFunction<Int, Unit> {
            loop = false
        })
        while (loop) {
            Pa_Sleep(20)  // Sleep 20ms
        }
        io.cleanup()
        Pa_Terminate()

How would I compile C/++ code to statically link against with the gradle plugin?

Is anyone else experiencing odd behavior across platforms? on linux, kotlin/native assumes an

unsigned long

is a ULong, but on windows it's parsed as

UInt

Is it common for gradle to run out of memory while compiling a k/n project? I have 16GB available but having only my DE and IJ running takes ~5GB RAM, but I need to exit IJ every 3 times or so just because it keeps running out of memory with the message "Daemon will be stopped at the end of the build after running out of JVM memory"

Hey 🙂 Was anyone able to bundle a cocoapod dependency with this plugin? It generates the header of the kotlin code but the dependency is not included 🤔

Is it possible to link one def file to another? For example, In my gtk kotlin library I want to separate the different headers of gtk into subprojects to lower build times while developing. If I were to have a def for each, I would have repeated bindings generated. IE GError then another GError then another GError. The idea is that, by linking one def as a requirement for another, It would just build on top of the previous def and not need to regenerate code TLDR; Dependencies of def for a def

Hi, I noticed there is a new "ios_simulator_arm64" target in the 1.5.20 native compiler. Can this already be used together with the multiplatform gradle plugin to compile projects for the M1 simulator? I can’t find anything in the docs but perhaps there’s a way to patch things together already?

Hello! I am currently exploring the world of kotlin-native in the context of a multiplatform project. However I have some newby problems with converting syntax. How I map

NSData *nsdataFromBase64String = [[NSData alloc]initWithBase64EncodedString:base64Encoded options:0];

into Kotlin? I understand what the function wants...but I do not catch the

[NSData alloc]

to write in Kotlin. Anybody here maybe knows that?

How do I allocate a pointer to pass in c function to store the result at? I am aware about

memScoped { val result = alloc<T>() }

, but with that the pointer is gone as soon as memScoped returns and I neet to keep reference to that pointer afer it treturns.

Hey all, have a multiplatform, multi-module project that I'm upgrading from Kotlin 1.5.10 to 1.5.20 When I run

./gradlew iosX64Test

on 1.5.10, everything passes When I run

./gradlew iosX64Test

on 1.5.20, tests for one specific module are consistently giving me a segfault, both on my local machine and on CI (see thread for output) No other changes besides the version number. Any likely-culprit known issues in 1.5.20 that would cause this that I could follow on YT? Any tips on how to track down the issue or work around it?

I am accessing attributes in iOS (NSBundle.mainBundle().infoDictionary attributes) for my KMM project. I want to be able to mock this in unit tests. Any suggestions on how I can accomplish this?

Can I somehow build my project on OSX without shitty xcode installed (only xcode command line tools)?

Getting the following error when running commonizer on cinterop (all osx targets + linuxX64)

Exception in thread "main" java.lang.IllegalStateException: Resolved classifier platform/posix/__darwin_size_t of type TypeAlias. Expected: Class.

Any tips?

I’m updating an app from Kotlin 1.4.10 to 1.5.20, and a lot of dependencies. It’s an app made with just the UI/View in Swift, Presenter/Model level stuff and above is all Kotlin, so it has a KMP project inside it named

Mpp

, which compiles into a Framework. I have this data class in the

Mpp

project:

data class Event(
    // …
    val publicName: String?,
    // …
) {

    // …

    val hasPublicName: Boolean
        get() = !publicName.isNullOrBlank()

}

Somewhere in Swift, I have this:

func configure(_ event: Event) {
        if event.hasPublicName {
            eventTypeLabel.isHidden = true
            locationView.isHidden = true
            publicNameLabel.isHidden = false
            publicNameLabel.text = event.publicName
    // …

I didn’t change any of these files, but I now get this error (worked in 1.4.10):

2021-07-09 15:46:41.834833+0200 MyApp[25797:9497146] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[MppEvent hasPublicName]: unrecognized selector sent to instance 0x600001ae5650'

Maybe I broke something in the way the project is built, but I don’t know what. I don’t know what could cause this. I also tried to replace

event.hasPublicName

in Swift with

event.publicName != nil

but then it crashes the same way but on

publicName

. I’m tweaking the XCode project a lot, and now I don’t know what could cause this?

What gradle build do i run to download kotlin native tooling? I'm after bare-minimum work to get that tooling cached, so

./gradlew build

is a bit too fat for my use case.