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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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pthread_..._defer_np(3) Library Functions Manual pthread_..._defer_np(3)
pthread_cleanup_push_defer_np, pthread_cleanup_pop_restore_np -
push and pop thread cancelation clean-up handlers while saving
cancelability type
POSIX threads library (libpthread, -lpthread)
#include <pthread.h>
void pthread_cleanup_push_defer_np(typeof(void (void *)) *routine,
void *arg);
void pthread_cleanup_pop_restore_np(int execute);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
pthread_cleanup_push_defer_np(), pthread_cleanup_pop_defer_np():
_GNU_SOURCE
These functions are the same as pthread_cleanup_push(3) and
pthread_cleanup_pop(3), except for the differences noted on this
page.
Like pthread_cleanup_push(3), pthread_cleanup_push_defer_np()
pushes routine 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"
(see pthread_setcanceltype(3)); this ensures that cancelation
clean-up will occur even if the thread's cancelability type was
"asynchronous" before the call.
Like pthread_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
matching pthread_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 in pthread_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);
GNU; hence the suffix "_np" (nonportable) in the names.
glibc 2.0
pthread_cancel(3), pthread_cleanup_push(3),
pthread_setcancelstate(3), pthread_testcancel(3), pthreads(7)
This page is part of the man-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 is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.15 2025-05-17 pthread_..._defer_np(3)
Pages that refer to this page: pthread_cleanup_push(3)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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