atomic_cmpxchg(9)

✨ atomic_cmpxchg(9) — Kernel API Manual ✨

okay so bestie, welcome to the atomic_cmpxchg(9) page from the Kernel API Manual 💅 this one is literally about an atomic compare and exchange, and we’re gonna keep every single deet. no cap.

🌸 NAME 🌸

atomic_cmpxchg — Atomic compare and exchange

🦋 SYNOPSIS 🦋

int atomic_cmpxchg (atomic_t *addr , int oldval , int newval );

🎀 ARGUMENTS 🎀

• addr — -- undescribed -- 😭 the manpage is literally not giving us anything else for this one, so that’s the whole description we got.
• oldval — the expected value of the futex ✨
• newval — the new value to try and assign the futex 🫶

💖 DESCRIPTION 💖

Return the old value of addr->val. periodt 💅 that’s the description, short and iconic.

🔥 SEE ALSO 🔥

• Kernel file ./tools/testing/selftests/futex/include/atomic.h
• atomic_inc(9), atomic_dec(9), atomic_set(9)

mwah 💋 this cutie comes from source/version ./tools/testing/selftests/fute..., dated October 2026, page atomic_cmpxchg(9) 🫶✨