Topic
Every post filed under Kotlin & Core Concepts.
Wrapping a callback API in a suspend function is four lines. The fifth line — invokeOnCancellation — is the one that decides whether cancelling actually stops anything, and it's the one people leave out.
One child throws and the whole scope dies. SupervisorJob fixes that — but you probably already have one and didn't know, and the way most people reach for it does nothing except break structured concurrency.
Threads block, and blocked threads freeze apps. Here's what a coroutine actually is, what a suspension point does, and why you can run 100,000 of them on a single thread.
