futex_wait_multiple_setup(9)

💅 futex_wait_multiple_setup(9)

ok so this is a page from the Kernel API Manual, bestie — we're talking about futex_wait_multiple_setup today and honestly? she's a baddie. let's get into it 🫶

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✨ NAME ✨

futex_wait_multiple_setup — the setup era before the waiting era. she prepares to wait on, and enqueue, multiple futexes at once. multitasking queen 👑

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🌸 SYNOPSIS 🌸

int futex_wait_multiple_setup (struct futex_vector *vs , int count , int
*woken );

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🎀 ARGUMENTS 🎀

• vs — the futex list you're waiting on. the whole squad, together, in one list 💖
• count — the size of the list. how many futexes are in the squad, no cap.
• woken — index of the last woken futex, if any. this one exists to notify the caller that it can return this index back to userspace. it's a return parameter, bestie, so like… it gives info back 🌈

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🦋 DESCRIPTION 🦋

okay so here's the vibe: this function prepares multiple futexes in a single step and enqueues them. one step! not a hundred little steps! efficient icon behaviour ✨

it may fail, jsyk — that happens if the futex list is invalid, or if any futex was already awoken. like, sorry, someone already woke her up, nothing to do here 😭

on success though? the task is ready to go into interruptible sleep 😴 lowkey iconic, highkey important.

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🔥 RETURN 🔥

• 1 — one of the futexes was woken by another thread 👀
• 0 — success, slay 💅
• <0 — one of these lil guys: -EFAULT, -EWOULDBLOCK or -EINVAL 💀

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🌟 SEE ALSO 🌟

• the kernel file <span>./kernel/futex/waitwake.c</span> (fr fr, go read it)
• futex_do_wait(9)
• futex_unqueue_multiple(9)
• futex_sleep_multiple(9)
• futex_wait_multiple(9)
• futex_wait_setup(9)

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and that's the whole page, bestie 🧚 this little gem lives in ./kernel/futex and it's dated October 2026 — so yeah, go forth and enqueue your futexes responsibly 💜🍓