kotlinx.coroutines

Library support for Kotlin coroutines

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kotlinx.coroutines

official JetBrains project
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Library support for Kotlin coroutines with multiplatform support.
This is a companion version for Kotlin 1.3.61 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

The libraries are published to kotlinx bintray repository,
linked to JCenter and
pushed to Maven Central.

Maven

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

<dependency>
    <groupId>org.jetbrains.kotlinx</groupId>
    <artifactId>kotlinx-coroutines-core</artifactId>
    <version>1.3.3</version>
</dependency>

And make sure that you use the latest Kotlin version:

<properties>
    <kotlin.version>1.3.61</kotlin.version>
</properties>

Gradle

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

dependencies {
    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.3'
}

And make sure that you use the latest Kotlin version:

buildscript {
    ext.kotlin_version = '1.3.61'
}

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

repository {
    jcenter()
}

Gradle Kotlin DSL

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

dependencies {
    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.3")
}

And make sure that you use the latest Kotlin version:

plugins {
    kotlin("jvm") version "1.3.61"
}

Make sure that you have either jcenter() or mavenCentral() in the list of repositories.

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, add dependency to
kotlinx-coroutines-core-common
(follow the link to get the dependency declaration snippet).

Android

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

implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.3'

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

R8 and ProGuard

For R8 no actions required, it will take obfuscation rules from the jar.

For Proguard you need to add options from coroutines.pro to your rules manually.

R8 is a replacement for ProGuard in Android ecosystem, it is enabled by default since Android gradle plugin 3.4.0 (3.3.0-beta also had it enabled).

JS

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

You can also use kotlinx-coroutines-core package via NPM.

Native

Kotlin/Native version of kotlinx.coroutines is published as
kotlinx-coroutines-core-native
(follow the link to get the dependency declaration snippet).

Only single-threaded code (JS-style) on Kotlin/Native is currently supported.
Kotlin/Native supports only Gradle version 4.10 and you need to enable Gradle metadata in your
settings.gradle file:

enableFeaturePreview('GRADLE_METADATA')

Since Kotlin/Native does not generally provide binary compatibility between versions,
you should use the same version of Kotlin/Native compiler as was used to build kotlinx.coroutines.

Building

This library is built with Gradle. To build it, use ./gradlew build.
You can import this project into IDEA, but you have to delegate build actions
to Gradle (in Preferences -> Build, Execution, Deployment -> Build Tools -> Gradle -> Runner)

Requirements

  • JDK >= 1.8 referred to by the JAVA_HOME environment variable. JDK must include JavaFX.
  • JDK 1.6 referred to by the JDK_16 environment variable. It is okay to have JDK_16 pointing to JAVA_HOME for external contributions.

Contributions and releases

All development (both new features and bug fixes) is performed in develop branch.
This way master sources always contain sources of the most recently released version.
Please send PRs with bug fixes to develop branch.
Fixes to documentation in markdown files are an exception to this rule. They are updated directly in master.

The develop branch is pushed to master during release.

  • Full release procedure checklist is here.
  • Steps for contributing new integration modules are explained here.

Main metrics

Overview
Name With OwnerKotlin/kotlinx.coroutines
Primary LanguageKotlin
Program languageKotlin (Language Count: 4)
Platform
License:Apache License 2.0
所有者活动
Created At2016-06-22 13:49:21
Pushed At2025-07-20 16:22:19
Last Commit At2025-04-22 14:19:55
Release Count105
Last Release Name1.10.2 (Posted on )
First Release Name0.3-beta (Posted on )
用户参与
Stargazers Count13.5k
Watchers Count295
Fork Count1.9k
Commits Count3.1k
Has Issues Enabled
Issues Count2471
Issue Open Count290
Pull Requests Count1536
Pull Requests Open Count35
Pull Requests Close Count425
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