Do you know how I should pass the underlying bytes of the string to that function?

Is is ok to do this:

myStringVal._encodeToByteArray_()._asUByteArray_()._refTo_(0)

There is so many concurrent options out there. I wonder, whats the most efficient and elegant way of doing a queue (like ConcurrentLinkedQueue) thats thread safe and able to add new items while consuming queue but only run one operation at the time (Protect another place not thread safe)? Feels like Mutex potentially but not sure.

I am struggling with the correct native translation of this API in my kotlin-native code. http://www.lmdb.tech/doc/group__mdb.html#ga4fa8573d9236d54687c61827ebf8cac0 The code is currently looking like this, but I’ve tried a similar variation using alloc<MDB_val> without success. The error I get is invalid argument and I’m positive it’s the MDB_val argument(s). Any help would be appreciated. https://github.com/CoreyKaylor/kotlin-lmdb

actual fun put(dbi: Dbi, key: ByteArray, data: ByteArray, vararg options: PutOption) {
        memScoped {
            key.usePinned { keyP ->
                val mdbKey = cValue<MDB_val>{
                    mv_data = keyP.addressOf(0)
                    mv_size = key.size.convert()
                }
                data.usePinned { dataP ->
                    val mdbData = cValue<MDB_val>{
                        mv_data = dataP.addressOf(0)
                        mv_size = data.size.convert()
                    }
                    println("Putting value")
                    check(mdb_put(ptr, dbi.dbi, mdbKey.ptr, mdbData.ptr, options.asIterable().toFlags()))
                    println("Put value")
                }
            }
        }

can anybody help me on this .. Could not find kotlin native prebuilt macos x86 641.8.21. Required by: this is happening when i try to run android kmm project in android studio in mac os

Hi 👋 I remember that at some point in the past there were plans to work on C++ interoperability for K/N. What happened there? Is anyone aware of a youtrack issue? I tried to search youtrack, google and slack, but I couldn’t find anything.

It is possible to configure

cocoapods

plugin to use bundler when executing

podInstall

task instead of simple

pod install

execution? I’d like to have cocoapods installed via Bundler rather than preinstalled in the system.

Curious if anyone ever thought about the possibility of a z/Architecture target for Native. AFAIK LLVM supports that target too

I'm trying to understand why the cocoapods configuration in build.gradle.kts for the shared module contains a reference to the Podfile that is under iosApp in all the samples? Is that necessary? I'm confused why the "library" needs a Podfile that is configured for a consumer of the shared library. This is in all of the samples I've seen for KMM that use cocoapods to import the shared module to iOS.

Hey! Does anyone know how to use threads in kotlin/native?

I have a question about signal handling and Kotlin/Native. I've managed to stumble into a working solution but I'm not certain why it works. Here's my scenario: I am working on

io_uring

bindings for Kotlin/Native. In doing so I need a worker thread that does a blocking operation to poll for completion events from the linux kernel. I need a mechanism to cancel this blocking operation, especially because

runInterruptible

doesn't exist in any form on native. To do this I've had to jump through a few hoops. I grab the underlying thread ID via

pthread_self

and then register a coroutine which invokes

pthread_kill(SIGINT)

when that coroutine is cancelled. Here's where things get weird. Originally I set up a signal handler via the libc

signal

API and invoked

pthread_exit

. This crashed the Kotlin/Native runtime. While debugging I commented that out and everything just...worked? The blocking operation from

io_uring

started magically returning

EINTR

meaning it was interrupted successfully despite my registered signal handler intercepting and suppressing the signal. Does that sound plausible? Here's the PR with a more thorough explanation if anyone is interested.

What are some strategies for debugging Kotlin/Native on Linux and Windows? I've found it pretty difficult to get any stack trace at all (let alone with line numbers) at times, having to resort to inserting log statements just to narrow down the line that causes the crash. It can be a fun challenge at times, but definitely not very efficient use of time. 🧵 with my latest crash output from a failing test on Linux.

how can I create a new instance of this struct, and also assign the values of the vectors?

typedef struct Ray {
    Vector3 position;       // Ray position (origin)
    Vector3 direction;      // Ray direction
} Ray;

Kotlin/Native generates a class with `val`s for the vector properties

expect class Ray(rawPtr: NativePtr) : CStructVar {
  expect companion object : CStructVar.Type {}

  expect val direction: Vector3 /* compiled code */
  expect val position: Vector3 /* compiled code */
}

I’ve tried to create a new instance using

cValue {}

val v = cValue<Ray> {
  this.direction.x = 1f
  this.direction.y = 2f
  this.direction.z = 3f
  this.position.x = 7f
  this.position.y = 8f
  this.position.z = 9f
}

but the direction and position vectors are still zero

I failed to find the documentation and AI as well, asking here. I want to create a class, call it lets say A and I want to be able to use that one as if it was String or Long. And using Kotlin contracts to verify its always like that. But imagine I am using Map<String, A> instead of using Map<String, Any> where I want to enforce Any to be of type String or Long. I know I can do this, just not entirely sure how. I think it was combination of value class and kotlin contract somehow?

How should I be passing in a float pointer to a C function? Here’s the C code I’m trying to translate:

void SetValue(const void *value, int type);

void main() {
    float runTime = 0.0f;

    while (true) {
        runTime++
        SetValue(&runTime, SET_VALUE_TYPE_RUNTIME);
        
        float target[3] = { 1.0f, 2.0f, 3.0f };
        SetValue(target, SET_VALUE_TYPE_TARGET);
    }
}

It makes sense to use

cValuesOf(1f, 2f, 3f)

for the target, since

target

is an array. But should I use

cValuesOf(runtime)

for a single number?

On channels, is there any reason you want to use tryEmit over emit, or why does it exist? Read blog post main difference emit can use buffer but not tryEmit. Got confused myself when I was trying to explain difference to a colleague. Whats the thing? 😁

I'd like to write a very simple CLI monitoring tool for personal use, on Windows. Does K/N offer some kind of pre-made library for Windows APIs? Like, a wrapper, or types.

Was the

excludeFilter

property removed from cinterop .def files at some point and the docs not updated? the IDE underlines it red and cinterop via gradle kotlin MPP compilations appears to ignore the property. Not sure how I can get cinterop to ignore a specific header by name, in this case

wayland-client.h

Hi. Im trying to add XCTest to a project. It almost works, autocomplete shows and allows me to import classes, but it fails when compiling

ld: framework not found XCTest

Why is compiling Kotlin Native so slow? I have added compose dependency to the project. When I change one line, JVM variant compiles in 1-3 seconds and native compiles in 30-40 seconds

FindFirstChangeNotificationW

expects a

DWORD

(

UInt

) as last parameter, but the constants are all

Int

Am I supposed to convert it with

toUInt

or is it a problem with the type definitions?

Hey, why does the cinterop gradle task in an mpp project require the static lib file to exist to run successfully? I thought that task just used headers to generate kotlin bindings, does it use the lib in some way? Also, what task is actually responsible for creating the klib? I'm trying to make a MPP project that has tasks to build a cmake project as a static lib and then I'd like to include that lib after it's been made. Anyone know how I might a) prevent cinterop from failing from the not yet built static lib and b) include a static lib in the generated klib.

Hi, how can I translate this Swift code to Kotlin?

let center = NSWorkspace.shared.notificationCenter
    
    init() {
        center.addObserver(forName: NSWorkspace.didLaunchApplicationNotification,
                            object: nil, // always NSWorkspace
                             queue: OperationQueue.main) { (notification: Notification) in
                                if let app = notification.userInfo?[NSWorkspace.applicationUserInfoKey] as? NSRunningApplication {
                                    if app.bundleIdentifier == "com.apple.Terminal" {
                                        // User just launched the Terminal app; should we be worried?
                                        print("blah")
                                    }
                                }
        }
    }

anyone manage to get kotlin on arm64

it seems there is arm64 for ios and tv0s but not for linux-arm64

os is debian bookworm.

I have openjdk-17

its not aarch64 for arm its arm64

Hi, I'm having a very difficult time trying to setup the SDL library for cinterop. I'm using mpp 1.9.0 with a target of mingwX64. The error I'm getting is:

<stdin>:1556:24: error: '__builtin_ia32_crc32qi' needs target feature sse4.2
        return (unsigned int)(__builtin_ia32_crc32qi(p0, p1));

I know my cpu supports sse4.2 so I assume it's a config for clang that konan uses? Google is failing entirely here, does anyone know if this is some flag I can provide to konan/clang to indicate that this should be enabled during cinterop? The error does not indicate at all what code in the SDL headers that it's choking on.

It looks like the linkerOpts in the cinterop .def file are used to create the klib, but if my mpp project is a library and not a binary, shouldn't it pass those linker opts onto the consumer of my library? I have a project wrapping SDL that I publish and then consume as a dependency in another project, and all the linkerOpts I specify are not being passed on to the consumer, even though I see them in them in the manifest file within the klib. Am I thinking of this wrong? Right now, I'm having to specify the libs that SDL requires in the consuming project that links an executable, but I'd like to specify them in the library project.