# Tokio & Async I/O (Rust)

> Tokio runtime, async tasks, select!, join!, timeout, tokio::spawn, async I/O file/jaringan

- 22 pertanyaan wawancara
- Senior
- [Pertanyaan Wawancara: Rust](https://sharpskill.dev/id/technologies/rust/pertanyaan-wawancara.md)

## 1. Apa peran utama runtime Tokio dalam aplikasi Rust asinkron?

**Jawaban**

Runtime Tokio menyediakan executor yang melakukan poll terhadap futures hingga selesai. Ia juga mengelola scheduler multi-thread (secara default) untuk mendistribusikan task ke beberapa thread OS, serta reactor untuk operasi I/O asinkron. Tanpa runtime, futures Rust tidak melakukan apa pun karena bersifat lazy secara default.

## 2. Bagaimana cara menginisialisasi runtime Tokio dengan macro #[tokio::main]?

**Jawaban**

Macro #[tokio::main] mengubah fungsi async main() menjadi titik masuk sinkron yang membuat runtime Tokio multi-thread dan menjalankan fungsi async. Macro ini secara otomatis menghasilkan boilerplate yang diperlukan untuk membuat runtime dan memblokir hingga future utama selesai.

## 3. Apa perbedaan antara #[tokio::main] dan #[tokio::main(flavor = "current_thread")]?

**Jawaban**

Secara default, #[tokio::main] membuat runtime multi-thread yang mendistribusikan task ke sebuah pool worker thread. Dengan flavor = "current_thread", runtime menjalankan semua task hanya pada thread utama, yang berguna untuk pengujian, aplikasi sederhana, atau ketika berbagi data antar thread harus dihindari.

## 19 pertanyaan lagi tersedia

- Apa yang dilakukan tokio::spawn() dan tipe apa yang dikembalikannya?
- Mengapa futures yang diteruskan ke tokio::spawn() harus 'static?

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