pthread_mutexattr_init(3)

💅 pthread_mutexattr_init — it's giving "manual page, Library Functions Manual energy" ✨

okay bestie, so this is a page from the Library Functions Manual and it's literally all about this one tiny little C function that sets you up before you even think about touching a mutex. we're talking pthread_mutexattr_init(3) and its partner in crime pthread_mutexattr_destroy(3). sit down, grab a strawberry 🍓, and let's get into it.

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🌸 NAME 🌸

pthread_mutexattr_init, pthread_mutexattr_destroy — the duo that initializes and destroys a mutex attributes object ✨

like, one of them makes it exist and the other one un-makes it. iconic behavior honestly.

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🎀 LIBRARY 🎀

the POSIX threads library — so when you compile you're linking libpthread with the flag -lpthread 🫶

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💖 SYNOPSIS 💖

#include <pthread.h>

int pthread_mutexattr_init(pthread_mutexattr_t *attr);
int pthread_mutexattr_destroy(pthread_mutexattr_t *attr);

that's it. two functions. both take a pthread_mutexattr_t *attr and both hand you back an int. no drama, no extra args, we love a minimal signature 💅

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✨ DESCRIPTION ✨

so here's the tea 🫖:

pthread_mutexattr_init() initializes the mutex attributes object that attr points to, filling it with default values for all attributes defined by the implementation. it's the "fresh out the box, untouched, factory settings" moment for your attributes object.

⚠️ okay listen, this part matters: the results of initializing an already initialized mutex attributes object are undefined. like… don't do that. that's not a vibe. that's chaos 😭

pthread_mutexattr_destroy() destroys a mutex attribute object, which literally makes it uninitialized. and the bestie twist? once a mutex attributes object has been destroyed, it can be reinitialized with pthread_mutexattr_init() 🦋 so it's not a permadelete, it's more like a… reset. rebirth era.

⚠️ and the flip side: the results of destroying an uninitialized mutex attributes object are also undefined. so please know which state your object is in before you start swinging 🙈

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🔥 RETURN VALUE 🔥

• on success? these functions return 0. periodt. 👑
• on error? they return a positive error number. (not a negative one bestie, positive. don't get it twisted ✨)

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🌈 STANDARDS 🌈

POSIX.1-2008. certified, standardized, official. the committee said yes 💜

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⭐ HISTORY ⭐

POSIX.1-2001. been around since way back, lowkey an elder of the pthreads world and still relevant 🎀

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🫶 NOTES 🫶

here's the one little caveat to tuck into your pocket: subsequent changes to a mutex attributes object do not affect mutex that have already been initialized using that object 🧚

so like, if you already made your mutex with that attr object, going back and changing the attr later does nothing to it. the mutex already took what it needed and moved on. it's giving "we are not taking questions about the past." 💀

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💜 SEE ALSO 💜

go read these next, no cap:

• pthread_mutex_init(3)
• pthread_mutexattr_getpshared(3)
• pthread_mutexattr_getrobust(3)
• pthreads(7)

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and that's the whole page, bestie!! 🦋🌸 this was pulled straight from Linux man-pages 6.20, dated 2026-02-08, and yeah the whole thing is literally just pthread_mutexattr_init(3) again at the bottom, we love a full circle moment 💖 now go forth and initialize your attributes responsibly, mwah 💅✨