rt_mutex_lock_nested(9)

💅 rt_mutex_lock_nested(9) 💅

okay so bestie, welcome to the Kernel API Manual ✨ — yes we're reading kernel locking docs now, we contain multitudes 🦋

🌸 NAME 🌸

rt_mutex_lock_nested — lock a rt_mutex 🔒 (yes literally that's it, it locks the mutex, icon behavior)

✨ SYNOPSIS ✨

void rt_mutex_lock_nested (struct rt_mutex *lock , unsigned int subclass );

that's the whole signature, no cap 🫶 returns void, so like… nothing comes back. it just does the thing.

🎀 ARGUMENTS 🎀

• lock — the rt_mutex to be locked 👑 this is the main character of the operation, the thing getting locked fr fr
• subclass — the lockdep subclass 🧚 that's the little number lockdep uses to tell apart different nesting levels of the same class of lock (iykyk)

💜 SEE ALSO 💜

like, go read these too, they're all in the kernel file ./kernel/locking/rtmutex_api.c and they're all giving rtmutex energy 😭:

• rt_mutex_lock(9)
• rt_mutex_lock_interruptible(9)
• rt_mutex_lock_killable(9)
• rt_mutex_trylock(9)
• rt_mutex_unlock(9)
• __rt_mutex_futex_unlock(9)
• __rt_mutex_init(9)
• rt_mutex_init_proxy_locked(9)
• rt_mutex_proxy_unlock(9)
• __rt_mutex_start_proxy_lock(9)
• rt_mutex_start_proxy_lock(9)
• rt_mutex_wait_proxy_lock(9)
• rt_mutex_cleanup_proxy_lock(9)

and that's the whole page bestie, you ate that 🍓 this lil masterpiece lives in ./kernel/locking, dated October 2026, and it's rt_mutex_lock_nested(9) from the Kernel API Manual — mwah, slay, go lock something 💅🔥