pthread_testcancel(3)

💅 pthread_testcancel(3) 💅

okay bestie, so we're in section 3 of the manual — the Library Functions Manual — and today's main character is pthread_testcancel. it lives in the POSIX threads library (libpthread, -lpthread), so yeah, you gotta link that bad boy. ✨

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🌸 NAME 🌸

pthread_testcancel — request delivery of any pending cancelation request

like, it's the "hey, are you there? someone's trying to cancel you" check-in. 🫶

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🎀 LIBRARY 🎀

POSIX threads library (libpthread, -lpthread)

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✨ SYNOPSIS ✨

#include <pthread.h>

void pthread_testcancel(void);

no arguments, no return, just vibes. 💅

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🦋 DESCRIPTION 🦋

so here's the tea: calling pthread_testcancel() creates a cancelation point inside the thread that called it. why does that matter? because if your thread is out here running code that has zero cancelation points in it, it's basically ghosting every cancelation request ever sent its way. 😭 dropping a pthread_testcancel() in there gives it a lil checkpoint so it can actually respond to a cancelation request. iconic behaviour, honestly.

and if cancelability is disabled (you'd do that with pthread_setcancelstate(3)), or if there's no cancelation request pending at all? then the call to pthread_testcancel() has no effect. nothing happens. it's giving "read at 4:47pm". 💀

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💖 RETURN VALUE 💖

this function does not return a value. none. zero. no return code for you to obsess over.

⚠️ BUT — and this is the important part — if the calling thread actually gets canceled as a consequence of calling this function, then the function does not return at all. like, ever. it just dips. 🫥

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🌈 ERRORS 🌈

this function always succeeds. she has never known failure. 👑

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⭐ ATTRIBUTES ⭐

for an explanation of the terms used in this section, see attributes(7).

• pthread_testcancel() — Thread safety: MT-Safe

so yeah, fully thread-safe, slay. 🔥

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💜 STANDARDS 💜

POSIX.1-2008.

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🧚 HISTORY 🧚

• glibc 2.0
• POSIX.1-2001

an elder. a legend. she's been here. 🙈

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🍓 EXAMPLES 🍓

See pthread_cleanup_push(3).

(yes bestie, go read that one, it's the whole plot.) 📖

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👑 SEE ALSO 👑

• pthread_cancel(3)
• pthread_cleanup_push(3)
• pthread_setcancelstate(3)
• pthreads(7)

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okay that's the whole page, no cap. this came to you straight from Linux man-pages 6.20, dated 2025-05-17 — mwah, take care of her. 💖✨🎀🦋