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android / platform / external / kotlinx.coroutines / 1c5ae48a466f44e3948a2f9e650e14279878ec21
commit1c5ae48a466f44e3948a2f9e650e14279878ec21[log] [tgz]
authorVsevolod Tolstopyatov <[email protected]>Tue Mar 21 07:52:31 2023 -0700
committerGitHub <[email protected]>Tue Mar 21 17:52:31 2023 +0300
tree15de166b054afd03721b2ea7735bb9f1608297bf
parent33b2a9a677344d5ea1f0aff71b433b5a20e3c0d6 [diff]
Fix oversubscription in Dispatchers.Default (#3684)

Previously, an arbitrary task was added to the scheduler's queue and the corresponding counter was incremented. The actual executing thread decremented the counter as soon as the task was done, meaning that, if timings are unlucky enough, the overall balance of blocking tasks could've been negative.

The second part of the equation is that all increments are atomic (instead of being CAS-based), meaning that due to programmatic bugs like the previous one, it's easy to overstep the boundary of adjacent masks, leaving the state in an inconsistent state.

Fix is trivial -- increment counter before publishing, do not reset it if the scheduler is closed and task wasn't added.

Fixes #3642
2 files changed
tree: 15de166b054afd03721b2ea7735bb9f1608297bf
  1. .github/
  2. .idea/
  3. benchmarks/
  4. buildSrc/
  5. docs/
  6. dokka-templates/
  7. gradle/
  8. integration/
  9. integration-testing/
  10. js/
  11. kotlinx-coroutines-bom/
  12. kotlinx-coroutines-core/
  13. kotlinx-coroutines-debug/
  14. kotlinx-coroutines-test/
  15. license/
  16. reactive/
  17. site/
  18. ui/
  19. .gitignore
  20. build.gradle
  21. bump-version.sh
  22. CHANGES.md
  23. CODE_OF_CONDUCT.md
  24. CONTRIBUTING.md
  25. coroutines-guide.md
  26. gradle.properties
  27. gradlew
  28. gradlew.bat
  29. knit.properties
  30. LICENSE.txt
  31. README.md
  32. RELEASE.md
  33. settings.gradle
README.md

kotlinx.coroutines

Kotlin Stable JetBrains official project GitHub license Download Kotlin Slack channel

Library support for Kotlin coroutines with multiplatform support. This is a companion version for the Kotlin 1.8.10 release.

suspend fun main() = coroutineScope {
    launch { 
       delay(1000)
       println("Kotlin Coroutines World!") 
    }
    println("Hello")
}

Play with coroutines online here

Modules

Documentation

Using in your projects

Maven

Add dependencies (you can also add other modules that you need):

<dependency>
    <groupId>org.jetbrains.kotlinx</groupId>
    <artifactId>kotlinx-coroutines-core</artifactId>
    <version>1.7.0-Beta</version>
</dependency>

And make sure that you use the latest Kotlin version:

<properties>
    <kotlin.version>1.8.10</kotlin.version>
</properties>

Gradle

Add dependencies (you can also add other modules that you need):

dependencies {
    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.7.0-Beta")
}

And make sure that you use the latest Kotlin version:

plugins {
    // For build.gradle.kts (Kotlin DSL)
    kotlin("jvm") version "1.8.10"
    
    // For build.gradle (Groovy DSL)
    id "org.jetbrains.kotlin.jvm" version "1.8.10"
}

Make sure that you have mavenCentral() in the list of repositories:

repositories {
    mavenCentral()
}

Android

Add kotlinx-coroutines-android module as a dependency when using kotlinx.coroutines on Android:

implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.7.0-Beta")

This gives you access to the Android Dispatchers.Main coroutine dispatcher and also makes sure that in case of a crashed coroutine with an unhandled exception that this exception is logged before crashing the Android application, similarly to the way uncaught exceptions in threads are handled by the Android runtime.

R8 and ProGuard

R8 and ProGuard rules are bundled into the kotlinx-coroutines-android module. For more details see “Optimization” section for Android.

Avoiding including the debug infrastructure in the resulting APK

The kotlinx-coroutines-core artifact contains a resource file that is not required for the coroutines to operate normally and is only used by the debugger. To exclude it at no loss of functionality, add the following snippet to the android block in your Gradle file for the application subproject:

packagingOptions {
    resources.excludes += "DebugProbesKt.bin"
}

Multiplatform

Core modules of kotlinx.coroutines are also available for Kotlin/JS and Kotlin/Native.

In common code that should get compiled for different platforms, you can add a dependency to kotlinx-coroutines-core right to the commonMain source set:

commonMain {
    dependencies {
        implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.7.0-Beta")
    }
}

No more additional dependencies are needed, platform-specific artifacts will be resolved automatically via Gradle metadata available since Gradle 5.3.

Platform-specific dependencies are recommended to be used only for non-multiplatform projects that are compiled only for target platform.

JS

Kotlin/JS version of kotlinx.coroutines is published as kotlinx-coroutines-core-js (follow the link to get the dependency declaration snippet) and as kotlinx-coroutines-core NPM package.

Native

Kotlin/Native version of kotlinx.coroutines is published as kotlinx-coroutines-core-$platform where $platform is the target Kotlin/Native platform. Targets are provided in accordance with official K/N target support.

Building and Contributing

See Contributing Guidelines.