What allows proactive resumption of coroutine execution in asynchronous operations?

Proactive resumption of coroutine execution in Kotlin is facilitated by the resume function on the continuation object. In asynchronous operations, a coroutine is suspended and can be manually resumed when the result is ready.

For example, when using suspend functions, the coroutine suspends until the result is obtained, and then resume is called to continue execution.

This allows efficient management of asynchrony without blocking, implementing custom wait and resume mechanisms.

Example:

suspend fun awaitResult(): String = suspendCoroutine { cont ->
    someAsyncCall { result ->
        cont.resume(result) // initiates coroutine resumption
    }
}