PTHREAD..._DESTROY(3POSIX)

💖 PTHREAD..._DESTROY(3POSIX) 💖

okay bestie so this one lives in the POSIX Programmer's Manual, and it's the whole saga of pthread_barrierattr_destroy and pthread_barrierattr_init. yes it's a mouthful. yes we're doing it anyway. 🫶

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✨ PROLOG ✨

so like, this manual page is part of the POSIX Programmer's Manual. but heads up, the Linux implementation of this interface may differ — so if you're on Linux, go check the corresponding Linux manual page for the deets on Linux behavior. or, plot twist, the interface might not even be implemented on Linux at all. 🙈 not me finding that out the hard way.

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🌸 NAME 🌸

pthread_barrierattr_destroy, pthread_barrierattr_init — destroying and initializing the barrier attributes object. that's it. that's the job. 💅

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🎀 SYNOPSIS 🎀

#include <pthread.h>

int pthread_barrierattr_destroy(pthread_barrierattr_t *attr);
int pthread_barrierattr_init(pthread_barrierattr_t *attr);

look at them. twins. iconic. ✨

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🦋 DESCRIPTION 🦋

okay so first up, pthread_barrierattr_destroy() shall destroy a barrier attributes object. simple enough.

now here's the part you gotta internalize: a destroyed attr attributes object can be reinitialized using pthread_barrierattr_init(). but if you go referencing the object any other way after it's been destroyed? the results are undefined. and an implementation may cause pthread_barrierattr_destroy() to set the object referenced by attr to an invalid value. so like, don't be out here touching it. 🙅

next: pthread_barrierattr_init() shall initialize a barrier attributes object attr with the default value for all of the attributes defined by the implementation. defaults, bestie. it's giving fresh start. 🌈

but — and this is important — if pthread_barrierattr_init() is called specifying an already initialized attr attributes object, the results are undefined. so no double-initializing. we don't do that here. 💀

also, once a barrier attributes object has been used to initialize one or more barriers, any function affecting the attributes object (including destruction) shall not affect any previously initialized barrier. the barriers already made? they're fine. they don't care. they're unbothered. 👑

and finally, the behavior is undefined if the value specified by the attr argument to pthread_barrierattr_destroy() does not refer to an initialized barrier attributes object. so pls pls pls make sure it's initialized first. 🥺

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💜 RETURN VALUE 💜

if everything goes well, both pthread_barrierattr_destroy() and pthread_barrierattr_init() shall return zero. slay.

otherwise? an error number shall be returned to indicate the error. so like, not zero. check it. 🔥

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🍓 ERRORS 🍓

pthread_barrierattr_init() shall fail if:

• ENOMEM — there's not enough memory to initialize the barrier attributes object. 😭 the vibes are bad, the memory is low.

and then, a very specific note that lives rent free in my head:

These functions shall not return an error code of [EINTR].

periodt. no [EINTR] here. 💅

oh and also, the following sections are informative — so like, the next few sections are vibes, not law. iykyk. 🧚

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⭐ EXAMPLES ⭐

None. literally nothing. the void. 🕳️✨

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💜 APPLICATION USAGE 💜

None. again. nothing. we're on a roll. 🎀

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🌈 RATIONALE 🌈

so the reasoning goes like this: if an implementation detects that the value specified by the attr argument to pthread_barrierattr_destroy() does not refer to an initialized barrier attributes object, it's recommended that the function should fail and report an [EINVAL] error.

like, it's a recommendation, not a demand. but it's a good one. 🫶

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🦋 FUTURE DIRECTIONS 🦋

None. the future is a mystery, but this section is empty. 🌸

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💖 SEE ALSO 💖

• pthread_barrierattr_getpshared()
• The Base Definitions volume of POSIX.1‐2017, <pthread.h>

go read those too bestie, they're in the same universe. 👑

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👑 COPYRIGHT 👑

okay so the legal tea, word for word, because we do not mess with the legal tea:

Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .

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and that's the whole page, bestie!! 💅✨ this little legend came to you from IEEE/The Open Group, dated 2017, filed under PTHREAD..._DESTROY(3POSIX). mwah. go destroy and initialize responsibly. 🫶🎀💖