Alternative for thread pools in K/N? Or depend on C-libs probably? How does multithreaded-threaded coroutines K/N manages it?

Commonizer for [mingwX64, mingwX86] is failing on Windows Server amd64 (logs in thread). Anyone knows if this is expected due to different architectures?

I have a crash that doesn't give me much information, how can I get better crash information than the following:

Crashed: com.apple.root.utility-qos
SIGABRT ABORT 0x00000001bfed5414
0
libsystem_kernel.dylib
__pthread_kill + 8
1
libsystem_pthread.dylib
pthread_kill + 272
2
libsystem_c.dylib
abort + 104
3
GaiaProgress
ObjHeader::createMetaObject(TypeInfo**) + 4344939580
4
GaiaProgress
TerminateWithUnhandledException + 4344970116
5
GaiaProgress
KonanTerminateHandler() + 4344969660
6
libc++abi.dylib
std::__terminate(void (*)()) + 20
7
libc++abi.dylib
std::terminate() + 44
8
libobjc.A.dylib
_objc_terminate() + 14
9
libdispatch.dylib
_dispatch_client_callout + 40
10
libdispatch.dylib
_dispatch_root_queue_drain + 656
11
libdispatch.dylib
_dispatch_worker_thread2 + 116
12
libsystem_pthread.dylib
_pthread_wqthread + 216
13
libsystem_pthread.dylib
start_wqthread + 8

Does Kotlin Native have any facilities available that make it easier to manage buffers? Below is a code snippet that combines image files into a single file:

internal actual fun combineImageFiles(dirPath: String) {
    val appendBinaryMode = "ab"
    val readBinaryMode = "rb"
    val arena = Arena()
    val entries = listDirectory(dirPath).sortedWith(ImageNameComparator())
    val videoFile = fopen("$dirPath/video.mjpg", appendBinaryMode)
    entries.forEach { e ->
        val dataSize = fileSize("$dirPath/$e")
        val tmpFile = fopen("$dirPath/$e", readBinaryMode)
        val data = arena.allocArray<ByteVar>(dataSize.toInt())
        fread(__n = 1, __stream = tmpFile, __ptr = data, __size = dataSize)
        fclose(tmpFile)
        fwrite(__n = 1, __s = videoFile, __ptr = data, __size = dataSize)
    }
    arena.clear()
    fclose(videoFile)
    Unit
}

This snippet works however it is using multiple buffers which isn't ideal. If there are a lot of image files being handled then the memory usage would become excessive.

How do I properly make this code C++ in Kotlin/Native?

long ns;
struct timespec spec;
clock_gettime(CLOCK_REALTIME, &spec);
ns = spec.tv_nsec;

I came up with this Kotlin/Native syntax but I can't access the tv_nsec member of the timespec struct and this is the only working code so far:

val spec: CValuesRef<timespec>? = null
clock_gettime(CLOCK_REALTIME, spec)

to actually access the output, I would need the following code (right)?:

var ns: Long
val spec: CValuesRef<timespec>? = null
clock_gettime(CLOCK_REALTIME, spec)
ns = spec.tv_nsec

So, how do I correctly do this?

Dear Community I have a use case where i have to add couple of values to data store, we are already in the process of moving away from shared preferences, inside a library but i already have a data store created for main app module as there was a need earlier. 1. Move the entire data store manager class to library so that both main and app module can access it - If i add a new module then this becomes a pain point so this should not be a good choice - please correct me if i am wrong. 2. create a new data store in a different name for the library module and use it Please let me know your feedback. Thank you!

Is there a mechanism for adding additional arbitrary metadata to Obj-C headers generated by Kotlin/Native? Say, in form of comments or something similar

Is there an annotation like

@cdecl("name")

or something similar I can use for controlling the name of an exported Kotlin function in a DLL? I have to create a DLL with a particular entrypoint function name (loaded by name, by a third-party application) and currently the only solution I can think of is to create a wrapper C file like:

__declspec(dllexport) int Entrypoint(_args) {
  kotlinmain(_args)
}

Running into this issue where cinterop generation for libjpeg fails with the following error:

Exception in thread "main" java.lang.Error: /usr/include/jpeglib.h:792:3: error: unknown type name 'size_t'

Below are the contents of the def file:

headers = jpeglib.h
linkerOpts = -ljpeg
linkerOpts.linux_x64 = -L/usr/lib/x86_64-linux-gnu

The following include paths are used in the build file:

"/usr/include", "/usr/include/x86_64-linux-gnu"

Got my hands very dirty today with C++/Arduino code, and I am seriously considering finding a way to generate that C++ from Kotlin code (because Kotlin is easier to write and read as a human). Why not directly to machine code? First, I have no idea how to generate correct machine code that could run on AVR microcontrollers. Second, I don't see myself checking the generated machine code, while for C++, it's doable to a certain extent. Would someone want to brainstorm that idea with me?

Is it possible to do cinterop with just a Gradle build file, and no def files?

Is it a known issue that we can’t call inline reified function as a method reference in Kotlin Native, because it causes

unsupported call of reified inlined function

? Example in thread

Is it possible to use pure sockets with kotlin-native? Normal client socket. After some searching it seems my best bet is ktor-network, but I'm not quite able to get the example to run. At the moment it's stuck at not being able to resolve "ActorSelectorManager". Could be it's Android-specific? I got a normal console app

Hello everyone. Please has anyone tried using Rust with Kotlin/Native?

I've been attempting to convert a list into a va-list. But I have been having issues with which 'va_list' the code is pointing to

e: /mnt/bulk/SourceCode/git/kotlinx-gtk/nativex/src/nativeMain/kotlin/nativex/glib/Variant.kt: (53, 4): Type mismatch: inferred type is va_list /* = CPointer<platform.posix.__va_list_tag> */ but va_list? /* = CPointer<platform.builtin.__va_list_tag>? */ was expected

Is the error I get, but

platform.builtin

has no members I can see

So this started appearing after an update to v1.5.0-RC... I'm assuming it's beneign, but I haven't set any manual test dependencies, so this is just kinda happening now.

Different question, why was the

linux_x64

linker changed from ld.lld to ld.gold in Kotlin v1.5.0?

Hi all, I’d like to use a pattern where I have an abstract class

A

with an abstract property (

a

) and a class

B

which overrides property

a

. Now

A

lives in the K/N world and I want

B

to be

@Published

. I suppose there is no way to express the

@Published

annotation in K/N so

B

must be written in Swift. Now Swift does not know about abstract classes and thinks

a

was a stored property and complains:

Cannot override with a stored property 'counter'

Do you guys see any way to get a subclass of Kotlin cass

A

with

@published

property

a

?

I am trying to setup curl in my multiplatform project by following this guide: https://kotlinlang.org/docs/curl.html#generate-bindings But when I try to add Interop to host targets , it doesn’t get recognised by IDE…. Any help is appreciated!

How bad of an idea is it to pass variable-capturing lambdas as StableRefs to C callbacks? i.e. pass my callback function as the data pointer, and make the static C function unwrap and call it. Example in thread.

Does anyone have a way of highlighting exceptions on iOS for methods that weren’t tagged with

@Throws

? Recently got burned because we forgot to add that annotation to a method and the crashes weren’t even getting sent up to Crashlytics 😅

9 months ago there was the announcement that a new memory model for Kotlin/Native was being developed. Do we have any news about it? Any idea when this will see the light?

Is there a way to register a shutdown hook in native? Equivalent with this on JVM:

Runtime.getRuntime().addShutdownHook(Thread {
        println("shutting down")
    })

Hey all. I’ve started getting

Project 'kotlin-native' not found in root project 'kotlin'

when trying to compile

kotlin-native

via

./gradlew :kotlin-native:dist

Anyone also experiencing this? I’m using the latest master commit.

Are there any plans to add destructors to kotlin native at least? It would make developing mpp libraries that use cinterops on the native side that much easier...

Hello, Guys, please help with some hints https://kotlinlang.slack.com/archives/CRDCFF3RC/p1618789475054600

Hi, On Kotlin Native 1.4.32 this simple test crashes with a segmentation fault in the iOS simulator:

import kotlin.test.Test
import kotlin.test.assertEquals

class Test {
    @Test
    fun stackOverflowOnRegexReplace() {
        val regex = Regex("[a]+")
        val input = "a".repeat(10_000)
        val output = regex.replace(input, "")
        assertEquals("", output)
    }
}

The reason is a stack overflow. There is too much recursion in the Regex classes on Kotlin Native, see the condensed call stack below. The crash happens when the input string is about 6300 characters long. On my iPhone 12 it happens much earlier, the input only has to be about 620 characters. I guess it depends on the target arch, optimizations, etc, how deep the call stack is before the crash happens. Is this a known issue? Or should I report it?

clock_gettime 0x00007fff20081334
std::__1::chrono::steady_clock::now() 0x00007fff202a0d72
konan::getTimeMicros() 0x000000010d2496d9
(anonymous namespace)::garbageCollect(MemoryState*, bool) 0x000000010d213acc
ObjHeader* (anonymous namespace)::allocInstance<true>(TypeInfo const*, ObjHeader**) 0x000000010d21f9aa
kotlin.native.BitSet.<get-asBitCoordinates>#internal BitSet.kt:61
BitSet#get BitSet.kt:344
kotlin.text.regex.CharClass.object-18.contains#internal CharClass.kt:497
AbstractCharClass#contains AbstractCharClass.kt:68
SupplementaryRangeSet#contains SupplementaryRangeSet.kt:127
SupplementaryRangeSet#matches SupplementaryRangeSet.kt:108
GroupQuantifierSet#matches GroupQuantifierSet.kt:75
SupplementaryRangeSet#matches SupplementaryRangeSet.kt:109
GroupQuantifierSet#matches GroupQuantifierSet.kt:75
SupplementaryRangeSet#matches SupplementaryRangeSet.kt:109
GroupQuantifierSet#matches GroupQuantifierSet.kt:75
... (about 10000 repeating lines)
SupplementaryRangeSet#matches SupplementaryRangeSet.kt:109
GroupQuantifierSet#matches GroupQuantifierSet.kt:75
SupplementaryRangeSet#matches SupplementaryRangeSet.kt:109
GroupQuantifierSet#matches GroupQuantifierSet.kt:75
SupplementaryRangeSet#matches SupplementaryRangeSet.kt:109
GroupQuantifierSet#matches GroupQuantifierSet.kt:75
AbstractSet#find AbstractSet.kt:95
AbstractSet#find _Collections.kt:256
AbstractSet#find AbstractSet.kt:95
SingleSet#find SingleSet.kt:46
Regex#find Regex.kt:167
Regex#find$default Regex.kt:160
Regex#replace Regex.kt:242
Regex#replace Regex.kt:234
Test#stackOverflowOnRegexReplace Test.kt:9
$Test$test$0.$stackOverflowOnRegexReplace$FUNCTION_REFERENCE$72.invoke#internal Test.kt:6
$<bridge-UNNN>invoke Test.kt:6
TestCase#run TestSuite.kt:85
kotlin.native.internal.test.TestRunner.run#internal TestRunner.kt:241
kotlin.native.internal.test.TestRunner.run#internal _Collections.kt:1819
kotlin.native.internal.test.TestRunner.run#internal TestRunner.kt:234
kotlin.native.internal.test.TestRunner.runIteration#internal TestRunner.kt:265
kotlin.native.internal.test.TestRunner.runIteration#internal Timing.kt:32
kotlin.native.internal.test.TestRunner.runIteration#internal TestRunner.kt:265
kotlin.native.internal.test.TestRunner.runIteration#internal _Collections.kt:1819
kotlin.native.internal.test.TestRunner.runIteration#internal TestRunner.kt:258
kotlin.native.internal.test.TestRunner.runIteration#internal Timing.kt:32
kotlin.native.internal.test.TestRunner.runIteration#internal TestRunner.kt:257
TestRunner#run TestRunner.kt:280
TestRunner#run Timing.kt:32
TestRunner#run TestRunner.kt:277
test#testLauncherEntryPoint Launcher.kt:22
test#main Launcher.kt:26
Konan_start Launcher.kt:25
Init_and_run_start 0x000000010d08836b
start 0x00007fff2025a3e9
start 0x00007fff2025a3e9

Hi there, I’m experiencing a similar issue while trying to link a test binary for iOS simulator: https://kotlinlang.slack.com/archives/C3SGXARS6/p1559551834011200 I followed the suggestion in thread and did this:

iosX64('iosX64').binaries.getByName('debugTest').linkerOpts('-framework Foundation')

but

ld

doesn’t seem to like this option: The difference is that the class is from Foundation (

NSURLSessionTaskTransactionMetrics

) and is only available in iOS 10+. At the moment this class is only used in actual code but not in tests. Btw, is there a way to see full

ld

invocations?

Hey guys, regarding to Kotlin/Native runtime performance: