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pthread_cleanup_push_defer_np(3) — Linux manual page

pthread_..._defer_np(3)  Library Functions Manualpthread_..._defer_np(3)

NAME        top

       pthread_cleanup_push_defer_np, pthread_cleanup_pop_restore_np -       push and pop thread cancelation clean-up handlers while saving       cancelability type

LIBRARY        top

       POSIX threads library (libpthread,-lpthread)

SYNOPSIS        top

#include <pthread.h>void pthread_cleanup_push_defer_np(typeof(void (void *)) *routine,void *arg);void pthread_cleanup_pop_restore_np(intexecute);   Feature Test Macro Requirements for glibc (seefeature_test_macros(7)):pthread_cleanup_push_defer_np(),pthread_cleanup_pop_defer_np():           _GNU_SOURCE

DESCRIPTION        top

       These functions are the same aspthread_cleanup_push(3) andpthread_cleanup_pop(3), except for the differences noted on this       page.       Likepthread_cleanup_push(3),pthread_cleanup_push_defer_np()       pushesroutine onto the thread's stack of cancelation clean-up       handlers.  In addition, it also saves the thread's current       cancelability type, and sets the cancelability type to "deferred"       (seepthread_setcanceltype(3)); this ensures that cancelation       clean-up will occur even if the thread's cancelability type was       "asynchronous" before the call.       Likepthread_cleanup_pop(3),pthread_cleanup_pop_restore_np() pops       the top-most clean-up handler from the thread's stack of       cancelation clean-up handlers.  In addition, it restores the       thread's cancelability type to its value at the time of the       matchingpthread_cleanup_push_defer_np().       The caller must ensure that calls to these functions are paired       within the same function, and at the same lexical nesting level.       Other restrictions apply, as described inpthread_cleanup_push(3).       This sequence of calls:           pthread_cleanup_push_defer_np(routine, arg);           pthread_cleanup_pop_restore_np(execute);       is equivalent to (but shorter and more efficient than):           int oldtype;           pthread_cleanup_push(routine, arg);           pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, &oldtype);           ...           pthread_setcanceltype(oldtype, NULL);           pthread_cleanup_pop(execute);

STANDARDS        top

       GNU; hence the suffix "_np" (nonportable) in the names.

HISTORY        top

       glibc 2.0

SEE ALSO        top

pthread_cancel(3),pthread_cleanup_push(3),pthread_setcancelstate(3),pthread_testcancel(3),pthreads(7)

COLOPHON        top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17pthread_..._defer_np(3)

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