VWAKEUP(9)

💖 VWAKEUP(9) 💖

okay so welcome to the Kernel Developer's Manual, bestie — this is the page for vwakeup(9), and it's lowkey a tiny function with main character energy. no cap, it's all about updating the outstanding I/O count on a vnode and doing a wakeup(9) when the vibe check says it's time. 💅

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🎀 NAME 🎀

vwakeup — update the outstanding I/O count and do a wakeup on a vnode. periodt. ✨

🦋 SYNOPSIS 🦋

#include <sys/param.h>
#include <sys/vnode.h>

void
vwakeup(struct vnode *vp);

🌸 DESCRIPTION 🌸

okay so the vwakeup() function updates the number of outstanding I/O operations on the target vnode. that count lives in the vnode's v_numoutput field — yes, that one, bestie. 💖

then, if the target vnode has the VBIOWAIT flag set in its v_bioflag field and it has no outstanding I/O operations remaining, a wakeup(9) is performed as well. it's giving "last one out, hit the lights" but for I/O. 🔥

also, important: the vwakeup() function must be called at splbio(9). not optional, not a suggestion, not a cute little extra. put it on the vibe check list. 🫶

👀 SEE ALSO 👀

• panic(9)
• splbio(9)
• vnode(9)
• vwaitforio(9)
• wakeup(9)

⭐ HISTORY ⭐

this document first appeared in OpenBSD 3.7. iconic behavior, honestly. ✨

💀 CAVEATS 💀

bestie, listen: calling vwakeup() more times than the number of outstanding I/O operations will cause the system to panic(9). like, full-on panic. not a drill. not a serve. just panic. 😭

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kisses and sparkles, this page is from Debian, dated August 14, 2013, and the manual page is VWAKEUP(9) — slay responsibly. 💅🎀🫶