Sourced from kotlinx-coroutines-core's releases.

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.

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;

... (truncated)

Sourced from kotlinx-coroutines-core's changelog.

Change log for kotlinx.coroutines

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

• When racing with cancellation, the future builder no longer reports unhandled exceptions into the global CoroutineExceptionHandler. Thanks @​vadimsemenov! (#2774, #2791).
• Mutex.onLock is deprecated for removal (#2794).
• Dispatchers.Main is now used as the default source of time for delay and withTimeout when present(#2972).
  • To opt-out from this behaviour, kotlinx.coroutines.main.delay system property can be set to false.
• Java target of coroutines build is now 8 instead of 6 (#1589).
• Source-breaking change: extension collect no longer resolves when used with a non-in-place argument of a functional type. This is a candidate for a fix, uncovered after 1.6.0, see #3107 for the additional details.

Bug fixes and improvements

• Kotlin is updated to 1.6.0.
• Kotlin/Native new memory model is now supported in regular builds of coroutines conditionally depending on whether kotlin.native.binary.memoryModel is enabled (#2914).
• Introduced CopyableThreadContextElement for mutable context elements shared among multiple coroutines. Thanks @​yorickhenning! (#2893).
• transformWhile, awaitClose, ProducerScope, merge, runningFold, runingReduce, and scan are promoted to stable API (#2971).
• SharedFlow.subscriptionCount no longer conflates incoming updates and gives all subscribers a chance to observe a short-lived subscription (#2488, #2863, #2871).

... (truncated)

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