Sourced from kotlinx-coroutines-reactive's releases.

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).
• Flow exception transparency mechanism is improved to be more exception-friendly (#3017, #2860).
• Cancellation from flat* operators that leverage multiple coroutines is no longer propagated upstream (#2964).
• SharedFlow.collect now returns Nothing (#2789, #2502).
• DisposableHandle is now fun interface, and corresponding inline extension is removed (#2790).
• FlowCollector is now fun interface, and corresponding inline extension is removed (#3047).
• Deprecation level of all previously deprecated signatures is raised (#3024).
• The version file is shipped with each JAR as a resource (#2941).
• Unhandled exceptions on K/N are passed to the standard library function processUnhandledException (#2981).
• A direct executor is used for Task callbacks in kotlinx-coroutines-play-services (#2990).
• Metadata of coroutines artifacts leverages Gradle platform to have all versions of dependencies aligned (#2865).
• Default CoroutineExceptionHandler is loaded eagerly and does not invoke ServiceLoader on its exception-handling path (#2552).
• Fixed the R8 rules for ServiceLoader optimization (#2880).
• Fixed BlockHound integration false-positives (#2894, #2866, #2937).
• Fixed the exception handler being invoked several times on Android, thanks to @​1zaman (#3056).
• SendChannel.trySendBlocking is now available on Kotlin/Native (#3064).
• The exception recovery mechanism now uses ClassValue when available (#2997).
• JNA is updated to 5.9.0 to support Apple M1 (#3001).

... (truncated)

Sourced from kotlinx-coroutines-reactive's changelog.

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).
• Flow exception transparency mechanism is improved to be more exception-friendly (#3017, #2860).
• Cancellation from flat* operators that leverage multiple coroutines is no longer propagated upstream (#2964).
• SharedFlow.collect now returns Nothing (#2789, #2502).
• DisposableHandle is now fun interface, and corresponding inline extension is removed (#2790).
• FlowCollector is now fun interface, and corresponding inline extension is removed (#3047).
• Deprecation level of all previously deprecated signatures is raised (#3024).
• The version file is shipped with each JAR as a resource (#2941).
• Unhandled exceptions on K/N are passed to the standard library function processUnhandledException (#2981).
• A direct executor is used for Task callbacks in kotlinx-coroutines-play-services (#2990).
• Metadata of coroutines artifacts leverages Gradle platform to have all versions of dependencies aligned (#2865).
• Default CoroutineExceptionHandler is loaded eagerly and does not invoke ServiceLoader on its exception-handling path (#2552).
• Fixed the R8 rules for ServiceLoader optimization (#2880).
• Fixed BlockHound integration false-positives (#2894, #2866, #2937).
• Fixed the exception handler being invoked several times on Android, thanks to @​1zaman (#3056).
• SendChannel.trySendBlocking is now available on Kotlin/Native (#3064).
• The exception recovery mechanism now uses ClassValue when available (#2997).

... (truncated)

• c51f795 Merge pull request #3105 from Kotlin/version-1.6.0
• 812f2dd Version 1.6.0
• bbb175b Fix Dispatchers.Main not being fully initialized on Android and Swing (#3101)
• 69bc2a3 Restore MPP backwards compatibility on K/JS and K/N (#3104)
• 10891bb Fix a broken sentence in CoroutineDispatcher.kt (#3102)
• f3db701 Fix indentation in Transform.kt (#3100)
• 7cc59e4 Version 1.6.0-RC3
• 2ddcbe8 Fix R8 warnings (#3090)
• d5a66e0 Add TimeSource implementation to TestCoroutineScheduler
• 7a249c3 Fix typo
• Additional commits viewable in compare view

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