unmerge_queues(9)

💅 unmerge_queues — the kernel API manual, bestie edition 🎀

okay so this is unmerge_queues(9) from the Kernel API Manual and honestly it's giving "small function, big responsibility" energy. let's get into it ✨

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🌸 NAME 🌸

unmerge_queues — unmerge queues, if possible. that's it. that's the whole vibe check. "if possible" is doing a lot of heavy lifting there and we love her for it 🫶

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✨ SYNOPSIS ✨

void unmerge_queues (struct sem_array *sma );

literally returns nothing (void), takes one thing, and does its little job. no cap 🔥

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🦋 ARGUMENTS 🦋

• sma — the semaphore array. that's your main character right there, the struct sem_array you're handing over 💖

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👑 DESCRIPTION 👑

ok so here's the tea: unmerge_queues unmerges the wait queues, but only if complex_count is 0. if complex_count isn't zero, bestie, it's not happening — hence the "if possible" in the NAME section. she said boundaries 💅

🚨 real talk: this function must be called prior to dropping the global semaphore array lock. that's not a suggestion, that's the rule. do not skip it, do not pass go, do not collect $200 🙈

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🌈 SEE ALSO 🌈

the whole friend group, fr fr — all from the kernel file ./ipc/sem.c:

• merge_queues(9)
• newary(9)
• wake_const_ops(9)
• do_smart_wakeup_zero(9)
• update_queue(9)
• set_semotime(9)
• do_smart_update(9)
• find_alloc_undo(9)

iykyk — go read them too, they're iconic 💜

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and that's the page!! mwah 💋 this one's brought to you by ./ipc, October 2026, serving kernel docs since forever ⭐ go forth and drop that lock after you call this, okay? 🧚💖