sync_test_and_clear_bit(9)

sync_test_and_clear_bit(9) — Kernel API Manual 🎀

okay so bestie, welcome to the sync_test_and_clear_bit(9) page 💖 this is the Kernel API Manual, and we're clearing a bit and handing back its old value. iconic behavior, no cap.

✨ NAME ✨

sync_test_and_clear_bit — Clear a bit and return its old value 💅

🌸 SYNOPSIS 🌸

int sync_test_and_clear_bit (long nr , volatile unsigned long *addr );

🎀 ARGUMENTS 🎀

• nr — Bit to clear 💅
• addr — Address to count from 🫶

💫 DESCRIPTION 💫

This operation is atomic and cannot be reordered. It also implies a memory barrier. so like… it's giving "do not reorder me, I mean it" energy, fr fr 😭🔥

🌈 SEE ALSO 🌈

Kernel file ./arch/x86/include/asm/sync_bitops.h plus these besties:

• sync_set_bit(9)
• sync_clear_bit(9)
• sync_change_bit(9)
• sync_test_and_set_bit(9)
• sync_test_and_change_bit(9)

cute sign-off time 💖 source/version: ./arch/x86/include/asm · date: October 2026 · manual: sync_test_and_clear_bit(9) — mwah, bye bestie 💋✨