wake_up_process(9)

💖 wake_up_process(9) 💖

okay so this is the Kernel API Manual entry for wake_up_process, and bestie, it's lowkey iconic: it wakes up a specific process. That's the whole assignment. 🫶

---

✨ NAME ✨

wake_up_process — Wake up a specific process. No cap, that's literally the job. 💅

---

🌸 SYNOPSIS 🌸

int wake_up_process (struct task_struct *p );

---

🎀 ARGUMENTS 🎀

• p — the process to be woken up, fr fr. That's the one getting the little scheduler poke. 🦋

---

💜 DESCRIPTION 💜

It attempts to wake up the nominated process and move it to the set of runnable processes. Like, "hey bestie, you're runnable now" energy. ✨

This function executes a full memory barrier before accessing the task state. That's the important caveat, no cap — don't sleep on the barrier. 🧚

---

⭐ RETURN ⭐

1 if the process was woken up, 0 if it was already running.

So: 1 = woke up and slayed, 0 = already up and running. Periodt. 👑

---

🌈 SEE ALSO 🌈

Kernel file ./kernel/sched/core.c, plus all the sibling lore:

• wake_q_add(9)
• wake_q_add_safe(9)
• task_curr(9)
• try_to_wake_up(9)
• task_call_func(9)
• cpu_curr_snapshot(9)
• preempt_notifier_register(9)
• preempt_notifier_unregister(9)
• prepare_task_switch(9)
• finish_task_switch(9)
• schedule_tail(9)
• schedule_preempt_disabled(9)
• preempt_schedule_notrace(9)
• init_idle(9)
• curr_task(9)

---

xoxo, your kernel bestie 💅 — source: ./kernel/sched, dated October 2026. slay. 🎀