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Clarify withContext(NonCancellable) behavior #2400

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Nov 18, 2020
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Clarify withContext(NonCancellable) behavior #2400

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4 changes: 4 additions & 0 deletions kotlinx-coroutines-core/common/src/Builders.common.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -133,6 +133,10 @@ private class LazyDeferredCoroutine<T>(
* which means that if the original [coroutineContext], in which `withContext` was invoked,
* is cancelled by the time its dispatcher starts to execute the code,
* it discards the result of `withContext` and throws [CancellationException].
*
* The cancellation behaviour described above is enabled if and only if the dispatcher is being changed.
* For example, when using `withContext(NonCancellable) { ... }` there is no change in dispatcher and
* this call will not be cancelled neither on entry to the block inside `withContext` nor on exit from it.
*/
public suspend fun <T> withContext(
context: CoroutineContext,
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