wait_event_idle(9)

💤 wait_event_idle — the manual page, but make it make sense 💤

okay so this is wait_event_idle(9) from the Kernel API Manual, and honestly? it's a whole vibe. let's get into it bestie 🫶

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✨ NAME ✨

wait_event_idle — sleep until your thing happens, but like… quietly. no cap, this one waits for a condition without contributing to system load. it's giving considerate queen behavior 👑

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🌸 SYNOPSIS 🌸

wait_event_idle (wq_head , condition );

that's it. that's the whole call. two arguments, one nap. literally iconic 💅

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🎀 ARGUMENTS 🎀

• wq_head — the waitqueue you're gonna wait on. your little waiting room, your designated nap spot 🛋️
• condition — a C expression for the event you're waiting for. like, the thing that has to become true before you're allowed to wake up ✨

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🦋 DESCRIPTION 🦋

so here's the tea ☕ — the process gets put to sleep in state TASK_IDLE, and it stays asleep until condition evaluates to true. and yeah, that condition gets checked every single time the waitqueue wq_head is woken up. every. single. time. 🔁

⚠️ important bestie, do not skip this: wake_up has to be called after you change any variable that could change the result of the wait condition. like, if you're out here mutating variables and not calling wake_up, your little sleeper is gonna be snoozing forever and that's not the slay you think it is 😭

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👑 SEE ALSO 👑

everything else in the waitqueue cinematic universe, all living in the kernel file ./include/linux/wait.h — collect them all bestie 🎀:

• waitqueue_active(9)
• wq_has_single_sleeper(9)
• wq_has_sleeper(9)
• wake_up_pollfree(9)
• wait_event(9)
• wait_event_freezable(9)
• wait_event_timeout(9)
• wait_event_cmd(9)
• wait_event_interruptible(9)
• wait_event_interruptible_timeout(9)
• wait_event_hrtimeout(9)
• wait_event_interruptible_hrtimeout(9)
• wait_event_idle_exclusive(9)
• wait_event_idle_timeout(9)
• wait_event_idle_exclusive_timeout(9)
• wait_event_interruptible_locked(9)
• wait_event_interruptible_locked_irq(9)
• wait_event_interruptible_exclusive_locked(9)
• wait_event_interruptible_exclusive_locked_irq(9)
• wait_event_killable(9)
• wait_event_state(9)
• wait_event_killable_timeout(9)
• wait_event_lock_irq_cmd(9)
• wait_event_lock_irq(9)
• wait_event_interruptible_lock_irq_cmd(9)
• wait_event_interruptible_lock_irq(9)
• wait_event_interruptible_lock_irq_timeout(9)

like, that's a lot of cousins. family reunion energy fr fr 🌈

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and that's the page!! 🫶 this little beauty lives in ./include/linux, and the version/date on the tin is October 2026 — so mark your calendars babes, wait_event_idle(9) said see you then 💜✨