Suspend

Fundamentals of suspend in Kotlin

High-Level Overview

In Kotlin, the suspend keyword is used to mark a function as suspendable, meaning it can be paused and resumed at a later time.

Suspending functions allow you to pause the execution of the current coroutine without blocking the thread.

Misconception: suspend does NOT make your function run async by itself.

Suspend does not instruct Kotlin to execute a function in a background thread. Suspending functions are only asynchronous if used explicitly as such.

Why Use suspend?

1. Non-blocking Operations: suspend functions allow you to perform long-running operations (like network requests or disk IO) without blocking the main thread.
2. Improved Readability: Code using suspend functions can be written in a sequential manner, making it more readable compared to callback-based approaches.
3. Resource Efficiency: By not blocking threads, coroutines can handle a large number of tasks with a small number of threads, leading to better resource utilization.

How suspend Works

A suspend function can suspend its execution without blocking the thread, and resume execution later. It can only be called from another suspend function or a coroutine.

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Children

1. How Expensive

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Backlinks

• Kotlin Co-Routine