clear_pending_set_locked(9)

💅 clear_pending_set_locked(9) — Kernel API Manual, but make it make sense

okay so bestie, gather round, because we're diving into clear_pending_set_locked — yes that's a whole mouthful, and yes it's from the Kernel API Manual, and no you're not gonna be scared of it by the end of this page. periodt. ✨

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🌸 NAME

clear_pending_set_locked — take ownership and clear the pending bit.

like, it literally says what it does on the tin, and honestly? iconic behaviour. 👑

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🦋 SYNOPSIS

void clear_pending_set_locked (arena_spinlock_t __arena *lock );

that's it. that's the whole signature. no cap, she's simple like that. 💅

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🎀 ARGUMENTS

• lock — Pointer to queued spinlock structure. yeah, it's the lock you're working with, she's the main character here. 🫶

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✨ DESCRIPTION

okay so here's the little glow-up moment this function performs:

*,1,0 -> *,0,1

read it like a before-and-after pic 💖 — the pending bit gets cleared, the locked bit gets set, and the lock has officially been taken. slay.

⚠️ real talk though: Lock stealing is not allowed if this function is used. like, fr fr, that's the rule — no sneaky little shortcuts around this one. 🙈

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💜 SEE ALSO

• Kernel file 📁 — ./tools/testing/selftests/bpf/libarena/include/bpf_arena_spin_lock.h
• xchg_tail(9)
• clear_pending(9)
• set_locked(9)
• arena_spin_trylock(9)
• arena_spin_lock(9)
• arena_spin_unlock(9)

go read those too, bestie, the whole friend group ate. 🔥

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anddd that's the page! source-squad credit goes to ./tools/testing/selftests/bpf/... and the date stamp is October 2026 ⭐ — mwah, thanks for reading, ily, bye! 🧚 💖