BUF_ISLOCKED(9)

💖 BUF_ISLOCKED 💖

okay bestie, so you wanna know if a buffer's lock is held?? say less, this page has you covered 🫶 it's from the Kernel Developer's Manual (section 9, kernel-land only, no user-space shenanigans here) and it's literally just one tiny function that tells you what's up with a lock. no cap.

✨ SYNOPSIS ✨

like always, you gotta include the whole squad first or nothing works:

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/uio.h>
#include <sys/bio.h>
#include <sys/buf.h>

int
BUF_ISLOCKED(struct buf *bp);

🌸 DESCRIPTION 🌸

so BUF_ISLOCKED() returns the status of the lock linked to the buffer, and it does it in relation to curthread (that's the thread you're running as, iykyk). it's giving "who's holding this lock and is it me??" energy 💅

it can return:

• LK_EXCLUSIVE — an exclusive lock is held by curthread. that's you bestie, main character energy 👑
• LK_EXCLOTHER — an exclusive lock is held by someone other than curthread. not you, someone else is in there 🙈
• LK_SHARED — a shared lock is held. everybody's sharing, cute 🎀
• 0 — the lock is not held by anyone. fully free, unlocked, living its best life ✨

🔥 SEE ALSO 🔥

buf(9), BUF_LOCK(9), BUF_UNLOCK(9), lockmgr(9), lockstatus(9)

💜 AUTHORS 💜

this manual page was written by Attilio Rao <attilio@FreeBSD.org>. iconic behavior fr fr 🌈

Debian · January 22, 2008 · that's the Debian-flavored BUF_ISLOCKED(9) page, mwah 💋 go check your locks bestie, ily, bye!! 🦋🌸