try_wait_for_completion(9)

📦 version 7.3.1, in nixpkgs unstable

💅 try_wait_for_completion(9) — the Kernel API Manual, bestie edition 🎀

okay so this page is from the Kernel API Manual, and it's about try_wait_for_completion(9). yes the name is a whole mouthful, we move 💅

✨ NAME ✨

try_wait_for_completion — try to decrement a completion without blocking. not me being impatient, it's literally the whole point 🫶

🌸 SYNOPSIS 🌸

bool try_wait_for_completion (struct completion *x );

literally one function, one argument, returns a bool. iconic, concise, no notes 💖

🎀 ARGUMENTS 🎀

  • x — the completion structure. that's it. that's the whole argument. she's low maintenance ✨

⭐ RETURN ⭐

  • 0 — if a decrement cannot be done without blocking 😭
  • 1 — if a decrement succeeded 🔥

so it's giving very binary, very "did we or didn't we", no in-between, periodt.

💅 DESCRIPTION 💅

okay so here's the vibe: if a completion is being used as a counting completion, this function attempts to decrement the counter without blocking. that's it, that's the whole mission 🧚

and why do we care? because this enables us to avoid waiting if the resource the completion is protecting is not available. like, why sit around waiting when you could just... not? main character energy fr fr 👑

no cap: the whole point is "peek, don't park." if it can't happen right now, 0 and keep it moving. if it can, 1 and slay. 🌈

🦋 SEE ALSO 🦋

kernel file ./kernel/sched/completion.c plus the whole completion friend group:

the way that's a whole squad 😭🫶 go read them too, iykyk 💜

and that's the page!! 🍓 this cutie lives in ./kernel/sched and the date on the original footer is October 2026 — so yeah, future-dated and still fabulous 💖✨ bye bestie, go decrement something responsibly 🎀

📦 where this page comes from