atomic_fetch_and(9)

📦 version 7.3.1, in nixpkgs unstable

💅 atomic_fetch_and(9) — from the Kernel API Manual, bestie ✨

okay so first things first: this page is atomic_fetch_and(9) from the Kernel API Manual, and it's genuinely one of the cutest little atomic ops out there. Let's get into it 🎀

🌸 NAME 🌸

atomic_fetch_and — atomic bitwise AND with full ordering. that's it. that's the whole vibe 💅

✨ SYNOPSIS ✨

int atomic_fetch_and (int i , atomic_t *v );

🦋 ARGUMENTS 🦋

  • i — an int value. your mask, your moment, your main character 🫶
  • v — pointer to an atomic_t. this is the thing getting updated, bestie.

💖 DESCRIPTION 💖

so what it does: it atomically updates v to (v & i) — and yes, with full ordering. literally the whole package 🔥

⚠️ okay so important: it is unsafe to use in noinstr code 😭 use raw_atomic_fetch_and there instead. no cap, please don't skip this one 🙈

👑 RETURN 👑

it gives you back the original value of v — like, before the AND happened. the before picture, if you will ✨

🧚 SEE ALSO 🧚

Kernel file ./include/linux/atomic/atomic-instrumented.h, and like... a lot of friends 💜 every single one of them, here we go:

the atomic_* girlies:

the atomic64_* icons:

the atomic_long_* legends:

and that's the whole page, bestie 🫶 this one lives in ./include/linux/atomic and it's dated October 2026 — go forth and AND atomically, you absolute icon 💅✨

📦 where this page comes from