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.

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.

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.

... (truncated)

Sourced from kotlinx-coroutines-core's changelog.

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

• 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).

... (truncated)

• 2ee99e2 Mention Kotlin 1.6.21 in the README
• 16c613d Version 1.6.3
• e9e14c9 Merge remote-tracking branch 'origin/master' into develop
• 923a037 Update atomicfu version to 0.17.3 (#3321)
• f101f93 Integration test project (#3307)
• 59994e2 Fix typos in Cancellation and Timeouts docs (#3317)
• c4cd1fd Update withContext KDoc (#3309)
• aedbcc7 Clarify implementation contract of ThreadContextElement and CopyableThreadCon...
• cc5b86a Remove NPM validation (#3312)
• 110ca3d Update docs about creating custom CoroutineScopes (#3306)
• Additional commits viewable in compare view

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