mirror of https://github.com/mkerrisk/man-pages
107 lines
3.5 KiB
Groff
107 lines
3.5 KiB
Groff
|
.\" Copyright (c) 2008 Linux Foundation, written by Michael Kerrisk
|
||
|
.\" <mtk.manpages@gmail.com>
|
||
|
.\"
|
||
|
.\" 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.\" manual page may be incorrect or out-of-date.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.
|
||
|
.\"
|
||
|
.TH PTHREAD_CLEANUP_PUSH_DEFER_NP 3 2008-12-04 "Linux" "Linux Programmer's Manual"
|
||
|
.SH NAME
|
||
|
pthread_cleanup_push_defer_np, pthread_cleanup_pop_restore_np \- push and pop
|
||
|
thread cancellation clean-up handlers while saving cancelability type
|
||
|
.SH SYNOPSIS
|
||
|
.nf
|
||
|
.B #include <pthread.h>
|
||
|
|
||
|
.BI "void pthread_cleanup_push_defer_np(void (*" routine ")(void *),"
|
||
|
.BI " void *" arg );
|
||
|
.BI "void pthread_cleanup_pop_restore_np(int " execute );
|
||
|
.sp
|
||
|
Compile and link with \fI\-pthread\fP.
|
||
|
.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.
|
||
|
|
||
|
Like
|
||
|
.BR pthread_cleanup_push (3),
|
||
|
.BR pthread_cleanup_push_defer_np ()
|
||
|
pushes
|
||
|
.I 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
|
||
|
.BR pthread_setcanceltype (3));
|
||
|
this ensures that cancellation clean-up will occur
|
||
|
even if the thread's cancelability type was "asynchronous"
|
||
|
before the the call.
|
||
|
|
||
|
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 cancellation 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 ().
|
||
|
|
||
|
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).
|
||
|
|
||
|
This sequence of calls:
|
||
|
|
||
|
.in +4n
|
||
|
.nf
|
||
|
pthread_cleanup_push_defer_np(routine, arg);
|
||
|
pthread_cleanup_pop_restore_np(execute);
|
||
|
.fi
|
||
|
.in
|
||
|
|
||
|
is equivalent to (but shorter and more efficient than):
|
||
|
|
||
|
.\" As far as I can see, LinuxThreads reverses the two sub-steps
|
||
|
.\" in the push and pop below.
|
||
|
.in +4n
|
||
|
.nf
|
||
|
int oldtype;
|
||
|
|
||
|
pthread_cleanup_push(routine, arg);
|
||
|
pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, &oldtype);
|
||
|
\&...
|
||
|
pthread_setcanceltype(oldtype, NULL);
|
||
|
pthread_cleanup_pop(execute);
|
||
|
.fi
|
||
|
.in
|
||
|
.\" SH VERSIONS
|
||
|
.\" Available since glibc 2.0
|
||
|
.SH CONFORMING TO
|
||
|
These functions are non-standard GNU extensions;
|
||
|
hence the suffix "_np" (non-portable) in the names.
|
||
|
.SH SEE ALSO
|
||
|
.BR pthread_cancel (3),
|
||
|
.BR pthread_cleanup_push (3),
|
||
|
.BR pthread_setcancelstate (3),
|
||
|
.BR pthread_testcancel (3),
|
||
|
.BR pthreads (7)
|