futex_sleep_multiple(9)

💤 futex_sleep_multiple — check sleeping conditions and sleep

okay bestie so we're diving into the Kernel API Manual, specifically futex_sleep_multiple(9), and honestly? it's giving "the nap function that could" ✨ because it literally does a vibe check before it lets you sleep. no cap. let's get into it 🫶

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🦋 SYNOPSIS 🦋

void futex_sleep_multiple (struct futex_vector *vs , unsigned int count
, struct hrtimer_sleeper *to );

that's the whole signature, bestie — she's a void, she returns nothing, she just does 💅

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🎀 ARGUMENTS 🎀

• vs — the list of futexes to wait for 👑 this is your main character list, the whole squad of futexes we're monitoring.
• count — length of vs. literally just how many futexes are in that list, no mystery, it's the count 🌸
• to — the timeout. a struct hrtimer_sleeper that shows up like the parent who said "you can stay out until midnight" 😭

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✨ DESCRIPTION ✨

so here's the tea 🍓 — she sleeps if and only if these two things are true:

1. the timeout hasn't expired yet ⏰ (like, it's still not over)
2. no futex on the list has been woken up 💀 (nobody's tapped anyone's shoulder yet)

both of those need to hold. that's the whole vibe check. if either one fails, no nap for you, bestie. it's giving "strict but fair" 💅

not me reading that as the simplest napping policy in the whole kernel — obsessed fr fr 🔥

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🌈 SEE ALSO 🌈

• Kernel file ./kernel/futex/waitwake.c 📂 — like, go read the actual source bestie, it's all in there
• futex_do_wait(9)
• futex_unqueue_multiple(9)
• futex_wait_multiple_setup(9)
• futex_wait_multiple(9)
• futex_wait_setup(9)

that's the whole friend group, they all hang out in the same file, iykyk 🧚💜

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and that's a wrap, bestie! 🎀 this page lives in the ./kernel/futex source, dated October 2026, and yes it's futex_sleep_multiple(9) — go take that nap, you've earned it 💖✨🦋