update_queue(9)

🌸 NAME 🌸

Okay so this is update_queue(9), straight out of the Kernel API Manual, and it is literally the function that looks for tasks that can be completed. Bestie, that is the whole name vibe. 💖

✨ SYNOPSIS ✨

int update_queue (struct sem_array *sma , int semnum , struct
       wake_q_head *wake_q );

🎀 ARGUMENTS 🎀

• sma — a semaphore array. Yep, the whole array. 🫶
• semnum — the semaphore that was modified. This little number matters. 👑
• wake_q — the lockless wake-queue head. Iconic lockless energy, no cap. 💅

💅 DESCRIPTION 💅

update_queue must be called after a semaphore in a semaphore array was modified. Like, that is the rule, bestie — do not skip it. ⭐

If multiple semaphores were modified, update_queue must be called with semnum = -1, as well as with the number of each modified semaphore. So yes, -1 and every modified semaphore’s number get their moment. 🌈

The tasks that must be woken up are added to wake_q. The return code is stored in q->pid. The function internally checks if const operations can now succeed. 🔥

The function returns 1 if at least one semop was completed successfully. That is the success signal, periodt. 💀✨

🔥 SEE ALSO 🔥

Lowkey go check the Kernel file ./ipc/sem.c, plus these absolute icons: unmerge_queues(9), merge_queues(9), newary(9), wake_const_ops(9), do_smart_wakeup_zero(9), set_semotime(9), do_smart_update(9), and find_alloc_undo(9). 🦋

Signed off from ./ipc, dated October 2026 — source/date vibe secured, and yes, this is the update_queue(9) manual page. Mwah. 💋💜