Building the Kotlin Coroutines Framework from Scratch

By Omkar Tenkale - Android Engineer @Gojek

suspend fun

Why?

1 special function

launch function

withContext

suspend fun blocks too!

Every statement in the coroutine will always run in same dispatcher

Dispatcher != Thread

coroutines do not declare what thread they run on, they declare what dispatcher they run on

Delay

Structured Concurrency

When a coroutine finishes, it needs to wait for its children

Cancellation

Modifying launch to support cancellation

Is it that simple?

Things we did not consider

Race conditions, Deadlocks

Multi language support

Edge cases

Performance optimizations

Flows, sequences, channels, actors, Mutexes, selects

Exception handling

github.com/Kotlin/kotlinx.coroutines

In depth coroutines

In depth coroutines

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