wq_has_single_sleeper(9)

💖 wq_has_single_sleeper — a kernel API manual page (section 9) 💖

okay so bestie, welcome to wq_has_single_sleeper(9), straight out of the Kernel API Manual. this one is smol but mighty, let's get into it 🫶

---

✨ NAME ✨

wq_has_single_sleeper — check if there is only one sleeper 👀

🌸 SYNOPSIS 🌸

bool wq_has_single_sleeper (struct wait_queue_head *wq_head );

like, that's the whole vibe. one function, one argument, returns a bool. iconic. 💅

🎀 ARGUMENTS 🎀

• wq_head — the wait queue head 💤 literally the thing you're checking on.

🦋 DESCRIPTION 🦋

so here's the tea: it returns true if wq_head has only one sleeper on the list. one. single. solitary. sleeper. no cap. 🔥

and if you want the full lore, please refer to the comment for waitqueue_active — that's where the backstory lives, iykyk 📖✨

ngl, this is a "go read the other function's comment" situation and honestly? valid.

🌈 SEE ALSO 🌈

Kernel file ./include/linux/wait.h:

• waitqueue_active(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(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 is a whole friend group of wait_event functions and they all ate 💀👑

---

and that's the page!! mwah 💋 this cutie lives in ./include/linux, dated October 2026, and its page name is wq_has_single_sleeper(9). go forth and check your sleepers, bestie 🧚💜