vdo_waitq_num_waiters(9)

💅 vdo_waitq_num_waiters ✨

okay so bestie, we're in the Kernel API Manual today — section 9, kernel-land, no cap — and the star of the show is vdo_waitq_num_waiters. yes it's a long name. yes it's giving "my function name is my whole personality." but it's literally the most useful little guy ever and i need you to know about it. 🫶

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🌸 NAME 🌸

vdo_waitq_num_waiters — returns the number of waiters in a vdo_wait_queue. that's it. that's the whole job. and it ate. 💖

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🦋 SYNOPSIS 🦋

size_t vdo_waitq_num_waiters (const struct vdo_wait_queue *waitq );

one function, one parameter, zero drama. const in there is doing its little protective thing so nobody messes with your waitq while you're asking questions. respect. 👑

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🎀 ARGUMENTS 🎀

• waitq — the vdo_wait_queue you want to query. like, the specific one. the one you're curious about. hand it over and it'll tell you what's up. 🍓

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⭐ RETURN ⭐

it returns the number of waiters in the waitq. that's the number of waiters. in the waitq. yes. counting. slay. 🔥

(it comes back as a size_t, so it's an unsigned count — which lowkey makes sense because you cannot have negative waiters, imagine 😭)

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🌈 SEE ALSO 🌈

• the kernel file ./drivers/md/dm-vdo/wait-queue.h — go read it, it's the whole vibe, iykyk 💜
• vdo_waiter_is_waiting(9) — for when you need to check on one specific waiter 🧚
• vdo_waitq_init(9) — for when the queue is brand new and hasn't met anyone yet 🌸
• vdo_waitq_has_waiters(9) — if you don't need the exact count and just want a yes/no vibe check 💅

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bestie note: this page is from ./drivers/md/dm-vdo, dated October 2026, and it's vdo_waitq_num_waiters(9) out of the Kernel API Manual — that's the whole citation, go off, cite responsibly, mwah 🫶✨