Sourced from kotlinx-coroutines-core's releases.

1.6.3

• Updated atomicfu version to 0.17.3 (#3321), fixing the projects using this library with JS IR failing to build (#3305).

1.6.2

• Fixed a bug with ThreadLocalElement not being correctly updated when the most outer suspend function was called directly without kotlinx.coroutines (#2930).
• Fixed multiple data races: one that might have been affecting runBlocking event loop, and a benign data race in Mutex (#3250, #3251).
• Obsolete TestCoroutineContext is removed, which fixes the kotlinx-coroutines-test JPMS package being split between kotlinx-coroutines-core and kotlinx-coroutines-test (#3218).
• Updated the ProGuard rules to further shrink the size of the resulting DEX file with coroutines (#3111, #3263). Thanks, @​agrieve!
• Atomicfu is updated to 0.17.2, which includes a more efficient and robust JS IR transformer (#3255).
• Kotlin is updated to 1.6.21, Gradle version is updated to 7.4.2 (#3281). Thanks, @​wojtek-kalicinski!
• Various documentation improvements.

0.12: Kotlin 1.1.0 release and reactive utilities

• Switched to Kotlin version 1.1.0 release.
• Reworked and updated utilities for Reactive Streams, Rx 1.x, and Rx 2.x with library-specific coroutine builders, suspending functions, converters and iteration support.
• LinkedListChannel with unlimited buffer (offer always succeeds).
• onLock select clause and an optional owner parameter in all Mutex functions.
• selectUnbiased function.
• actor coroutine builder.
• Couple more examples for "Shared mutable state and concurrency" section and "Channels are fair" section with ping-pong table example in coroutines guide.

0.6-beta: for Kotlin 1.1.0-beta-38

• Switched to Kotlin version 1.1.0-beta-38.
• A guide on coroutines is expanded.

0.5-beta: for Kotlin 1.1.0-beta-22

• Switched to Kotlin version 1.1.0-beta-22 (republished version).
• Removed currentCoroutineContext and related thread-locals without replacement. Explicitly pass coroutine context around if needed.
• lazyDefer(context) {...} coroutine builder and LazyDeferred interface are introduced.
• The default behaviour of all coroutine dispatchers is changed to always schedule execution of new coroutine for later in this thread or thread pool. Correspondingly, CoroutineDispatcher.isDispatchNeeded function has a default implementation that returns true.
• NonCancellable context is introduced.
• Performance optimizations for cancellable continuations (fewer objects created).
• A guide on coroutines is added.

0.4-beta: for Kotlin 1.1.0-beta-18

• Switched to Kotlin version 1.1.0-beta-18 (republished version).
• CoroutineDispatcher methods now have context parameter.
• Introduced CancellableContinuation.isCancelled
• Introduced EventLoop dispatcher and made it a default for runBlocking { ... }
• Introduced CoroutineScope interface with isActive and context properties; standard coroutine builders include it as receiver for convenience.

... (truncated)

Sourced from kotlinx-coroutines-core's changelog.

Change log for kotlinx.coroutines

Version 1.6.3

• Updated atomicfu version to 0.17.3 (#3321), fixing the projects using this library with JS IR failing to build (#3305).

Version 1.6.2

• Fixed a bug with ThreadLocalElement not being correctly updated when the most outer suspend function was called directly without kotlinx.coroutines (#2930).
• Fixed multiple data races: one that might have been affecting runBlocking event loop, and a benign data race in Mutex (#3250, #3251).
• Obsolete TestCoroutineContext is removed, which fixes the kotlinx-coroutines-test JPMS package being split between kotlinx-coroutines-core and kotlinx-coroutines-test (#3218).
• Updated the ProGuard rules to further shrink the size of the resulting DEX file with coroutines (#3111, #3263). Thanks, @​agrieve!
• Atomicfu is updated to 0.17.2, which includes a more efficient and robust JS IR transformer (#3255).
• Kotlin is updated to 1.6.21, Gradle version is updated to 7.4.2 (#3281). Thanks, @​wojtek-kalicinski!
• Various documentation improvements.

Version 1.6.1

• Rollback of time-related functions dispatching on Dispatchers.Main. This behavior was introduced in 1.6.0 and then found inconvenient and erroneous (#3106, #3113).
• Reworked the newly-introduced CopyableThreadContextElement to solve issues uncovered after the initial release (#3227).
• Fixed a bug with ThreadLocalElement not being properly updated in racy scenarios (#2930).
• Reverted eager loading of default CoroutineExceptionHandler that triggered ANR on some devices (#3180).
• New API to convert a CoroutineDispatcher to a Rx scheduler (#968, #548). Thanks @​recheej!
• Fixed a memory leak with the very last element emitted from flow builder being retained in memory (#3197).
• Fixed a bug with limitedParallelism on K/N with new memory model throwing ClassCastException (#3223).
• CoroutineContext is added to the exception printed to the default CoroutineExceptionHandler to improve debuggability (#3153).
• Static memory consumption of Dispatchers.Default was significantly reduced (#3137).
• Updated slf4j version in kotlinx-coroutines-slf4j from 1.7.25 to 1.7.32.

Version 1.6.0

Note that this is a full changelog relative to the 1.5.2 version. Changelog relative to 1.6.0-RC3 can be found at the end.

kotlinx-coroutines-test rework

• kotlinx-coroutines-test became a multiplatform library usable from K/JVM, K/JS, and K/N.
• Its API was completely reworked to address long-standing issues with consistency, structured concurrency and correctness (#1203, #1609, #2379, #1749, #1204, #1390, #1222, #1395, #1881, #1910, #1772, #1626, #1742, #2082, #2102, #2405, #2462 ).
• The old API is deprecated for removal, but the new API is based on the similar concepts (README), and the migration path is designed to be graceful: migration guide.

Dispatchers

• Introduced CoroutineDispatcher.limitedParallelism that allows obtaining a view of the original dispatcher with limited parallelism (#2919).
• Dispatchers.IO.limitedParallelism usages ignore the bound on the parallelism level of Dispatchers.IO itself to avoid starvation (#2943).
• Introduced new Dispatchers.shutdown method for containerized environments (#2558).
• newSingleThreadContext and newFixedThreadPoolContext are promoted to delicate API (#2919).

Breaking changes

... (truncated)

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