set_semotime(9)

💅 set_semotime — set sem_otime

okay so real talk, this is set_semotime(9), living in the Kernel API Manual. Yes bestie, section 9. We're in kernel-land now, put your hair up. 🎀

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✨ NAME ✨

set_semotime — literally just sets sem_otime. that's the whole vibe. short, sweet, iconic. 🫶

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🌸 SYNOPSIS 🌸

void set_semotime (struct sem_array *sma , struct sembuf *sops );

like, no return value, nothing to catch, she just does the thing. main character energy fr fr. ✨

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🦋 ARGUMENTS 🦋

• sma — the semaphore array 💖 like yeah, that one, the array itself.
• sops — the operations that modified the array, and it may be NULL 🫶 so don't panic if it's NULL, that's allowed, it's giving "optional but valid."

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💜 DESCRIPTION 💜

okay so here's the lore: sem_otime gets replicated, and the reason is so we avoid cache line trashing 😭 like genuinely, that's the whole point — nobody wants their cache lines getting messed up, ngl.

This function sets one instance to the current time. one. single. instance. current time. periodt. ⏰💅

no cap, it's just one instance getting the current time — don't go thinking it updates every copy, because that's not what this does. 🙈

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🔥 SEE ALSO 🔥

Kernel file ./ipc/sem.c and honestly the whole squad, all linked, all cute:

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

iykyk, that's the friend group. 💖

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and that's the page bestie!! 🧚💜 courtesy of the kernel file ./ipc, dated October 2026, and yes it's still set_semotime(9) — slay, bye! 🌈⭐