__ppc_yield(3)

✨ __ppc_yield(3) ✨

okay bestie, so this is a Library Functions Manual page, and we're talking about three lil functions that live in the Library Functions Manual section 3 — that's your "C library functions" corner of the manpage universe 💅

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🌸 NAME 🌸

__ppc_yield, __ppc_mdoio, __ppc_mdoom — hint the processor to release shared resources

📚 LIBRARY 📚

Standard C library (libc, -lc)

🦋 SYNOPSIS 🦋

#include <sys/platform/ppc.h>

void __ppc_yield(void);
void __ppc_mdoio(void);
void __ppc_mdoom(void);

💖 DESCRIPTION 💖

So these three functions are basically lil hints ✨ — they tell the CPU stuff about how resources are being used, specifically resources that are shared with other processors on the Power architecture. Think of it like being a good roommate: if you're not using the shared stuff right now, let the other processors have it, bestie 🤝

A classic use case? Say your program is just sitting there, waiting on a lock. You could totally be polite and divert those shared resources over to the other processors while you're parked 🙈

Here's the lineup, one by one:

• __ppc_yield() — this one drops a hint that performance will probably be improved if shared resources dedicated to the executing processor get released for other processors to use. It's giving "here, you take it, I'm chilling" 💅
• __ppc_mdoio() — this one hints that performance will probably be improved if shared resources dedicated to the executing processor get released until all outstanding storage accesses to caching-inhibited storage have been completed. Fr fr, that's the whole deal — it waits on the caching-inhibited ones 👀
• __ppc_mdoom() — same energy, but this hint says performance will probably be improved if shared resources dedicated to the executing processor get released until all outstanding storage accesses to cacheable storage for which the data is not in the cache have been completed. Cacheable storage, but the data isn't actually in the cache — the drama 😭

🎀 ATTRIBUTES 🎀

ngl, if you wanna know what all these terms even mean, go peek at attributes(7). Here's the tea:

• Interface: __ppc_yield(), __ppc_mdoio(), __ppc_mdoom()
• Attribute: Thread safety
• Value: MT-Safe

So yeah — all three of them are MT-Safe, meaning they're good to go in multithreaded contexts. Slay 🫶

🌈 STANDARDS 🌈

GNU.

⭐ HISTORY ⭐

glibc 2.18 — so she's been around a minute, an icon honestly 👑

🧚 SEE ALSO 🧚

__ppc_set_ppr_med(3)

Power ISA, Book II - Section 3.2 ("or" architecture)

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and that's a wrap, babe 💜 this was Linux man-pages 6.20, dated 2026-02-08, page __ppc_yield(3) — go forth and yield those shared resources responsibly, ily 🎀✨