Name
pthread_cleanup_push_defer_np, pthread_cleanup_pop_restore_np — push and pop thread cancellation clean-up handlers while saving cancelability type
Synopsis
#include <pthread.h>
void
pthread_cleanup_push_defer_np( |
void (*routine)(void
*), |
void *arg); |
void
pthread_cleanup_pop_restore_np( |
int execute); |
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DESCRIPTION
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 cancellation 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 cancellation 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
cancellation 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);
CONFORMING TO
These functions are nonstandard GNU extensions; hence the suffix "_np" (nonportable) in the names.
SEE ALSO
pthread_cancel(3), pthread_cleanup_push(3), pthread_setcancelstate(3), pthread_testcancel(3), pthreads(7)
COLOPHON
This page is part of release 4.07 of the Linux man-pages project. A
description of the project, information about reporting bugs,
and the latest version of this page, can be found at
https://www.kernel.org/doc/man−pages/.
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Copyright (c) 2008 Linux Foundation, written by Michael Kerrisk <mtk.manpagesgmail.com> %%%LICENSE_START(VERBATIM) Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date. The author(s) assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. The author(s) may not have taken the same level of care in the production of this manual, which is licensed free of charge, as they might when working professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. %%%LICENSE_END |