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-.\" Copyright (c) 2008 Linux Foundation, written by Michael Kerrisk
-.\"     <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH pthread_cleanup_push_defer_np 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-pthread_cleanup_push_defer_np, pthread_cleanup_pop_restore_np \- push and pop
-thread cancelation clean-up handlers while saving cancelability type
-.SH LIBRARY
-POSIX threads library
-.RI ( libpthread ", " \-lpthread )
-.SH SYNOPSIS
-.nf
-.B #include <pthread.h>
-.PP
-.BI "void pthread_cleanup_push_defer_np(void (*" routine ")(void *), void *" arg );
-.BI "void pthread_cleanup_pop_restore_np(int " execute );
-.fi
-.PP
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.PP
-.BR pthread_cleanup_push_defer_np (),
-.BR pthread_cleanup_pop_defer_np ():
-.nf
-    _GNU_SOURCE
-.fi
-.SH DESCRIPTION
-These functions are the same as
-.BR pthread_cleanup_push (3)
-and
-.BR pthread_cleanup_pop (3),
-except for the differences noted on this page.
-.PP
-Like
-.BR pthread_cleanup_push (3),
-.BR pthread_cleanup_push_defer_np ()
-pushes
-.I 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
-.BR pthread_setcanceltype (3));
-this ensures that cancelation clean-up will occur
-even if the thread's cancelability type was "asynchronous"
-before the call.
-.PP
-Like
-.BR pthread_cleanup_pop (3),
-.BR 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
-.BR pthread_cleanup_push_defer_np ().
-.PP
-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
-.BR pthread_cleanup_push (3).
-.PP
-This sequence of calls:
-.PP
-.in +4n
-.EX
-pthread_cleanup_push_defer_np(routine, arg);
-pthread_cleanup_pop_restore_np(execute);
-.EE
-.in
-.PP
-is equivalent to (but shorter and more efficient than):
-.PP
-.\" As far as I can see, LinuxThreads reverses the two substeps
-.\" in the push and pop below.
-.in +4n
-.EX
-int oldtype;
-\&
-pthread_cleanup_push(routine, arg);
-pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, &oldtype);
-\&...
-pthread_setcanceltype(oldtype, NULL);
-pthread_cleanup_pop(execute);
-.EE
-.in
-.SH STANDARDS
-GNU;
-hence the suffix "_np" (nonportable) in the names.
-.SH HISTORY
-glibc 2.0
-.SH SEE ALSO
-.BR pthread_cancel (3),
-.BR pthread_cleanup_push (3),
-.BR pthread_setcancelstate (3),
-.BR pthread_testcancel (3),
-.BR pthreads (7)