176 lines
4.5 KiB
HTML
176 lines
4.5 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of PTHREAD_CLEANUP_PUSH_DEFER_NP</TITLE>
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</HEAD><BODY>
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<H1>PTHREAD_CLEANUP_PUSH_DEFER_NP</H1>
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Section: Linux Programmer's Manual (3)<BR>Updated: 2017-09-15<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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pthread_cleanup_push_defer_np, pthread_cleanup_pop_restore_np - push and pop
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thread cancellation clean-up handlers while saving cancelability type
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<PRE>
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<B>#include <<A HREF="file:///usr/include/pthread.h">pthread.h</A>></B>
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<B>void pthread_cleanup_push_defer_np(void (*</B><I>routine</I><B>)(void *),</B>
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<B> void *</B><I>arg</I><B>);</B>
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<B>void pthread_cleanup_pop_restore_np(int </B><I>execute</I><B>);</B>
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</PRE>
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<P>
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Compile and link with <I>-pthread</I>.
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<P>
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Feature Test Macro Requirements for glibc (see
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<B><A HREF="/cgi-bin/man/man2html?7+feature_test_macros">feature_test_macros</A></B>(7)):
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<P>
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<B>pthread_cleanup_push_defer_np</B>(),
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<B>pthread_cleanup_pop_defer_np</B>():
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<DL COMPACT><DT id="1"><DD>
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_GNU_SOURCE
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</DL>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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These functions are the same as
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<B><A HREF="/cgi-bin/man/man2html?3+pthread_cleanup_push">pthread_cleanup_push</A></B>(3)
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and
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<B><A HREF="/cgi-bin/man/man2html?3+pthread_cleanup_pop">pthread_cleanup_pop</A></B>(3),
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except for the differences noted on this page.
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<P>
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Like
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<B><A HREF="/cgi-bin/man/man2html?3+pthread_cleanup_push">pthread_cleanup_push</A></B>(3),
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<B>pthread_cleanup_push_defer_np</B>()
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pushes
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<I>routine</I>
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onto the thread's stack of cancellation clean-up handlers.
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In addition, it also saves the thread's current cancelability type,
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and sets the cancelability type to "deferred" (see
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<B><A HREF="/cgi-bin/man/man2html?3+pthread_setcanceltype">pthread_setcanceltype</A></B>(3));
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this ensures that cancellation clean-up will occur
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even if the thread's cancelability type was "asynchronous"
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before the call.
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<P>
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Like
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<B><A HREF="/cgi-bin/man/man2html?3+pthread_cleanup_pop">pthread_cleanup_pop</A></B>(3),
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<B>pthread_cleanup_pop_restore_np</B>()
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pops the top-most clean-up handler from the thread's
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stack of cancellation clean-up handlers.
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In addition, it restores the thread's cancelability
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type to its value at the time of the matching
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<B>pthread_cleanup_push_defer_np</B>().
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<P>
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The caller must ensure that calls to these
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functions are paired within the same function,
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and at the same lexical nesting level.
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Other restrictions apply, as described in
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<B><A HREF="/cgi-bin/man/man2html?3+pthread_cleanup_push">pthread_cleanup_push</A></B>(3).
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<P>
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This sequence of calls:
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<P>
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pthread_cleanup_push_defer_np(routine, arg);
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pthread_cleanup_pop_restore_np(execute);
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<P>
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is equivalent to (but shorter and more efficient than):
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<P>
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int oldtype;
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<P>
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pthread_cleanup_push(routine, arg);
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pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, &oldtype);
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...
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pthread_setcanceltype(oldtype, NULL);
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pthread_cleanup_pop(execute);
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<A NAME="lbAE"> </A>
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<H2>CONFORMING TO</H2>
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These functions are nonstandard GNU extensions;
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hence the suffix "_np" (nonportable) in the names.
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<A NAME="lbAF"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?3+pthread_cancel">pthread_cancel</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+pthread_cleanup_push">pthread_cleanup_push</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+pthread_setcancelstate">pthread_setcancelstate</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+pthread_testcancel">pthread_testcancel</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?7+pthreads">pthreads</A></B>(7)
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<A NAME="lbAG"> </A>
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<H2>COLOPHON</H2>
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This page is part of release 5.05 of the Linux
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<I>man-pages</I>
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="2"><A HREF="#lbAB">NAME</A><DD>
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<DT id="3"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="4"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="5"><A HREF="#lbAE">CONFORMING TO</A><DD>
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<DT id="6"><A HREF="#lbAF">SEE ALSO</A><DD>
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<DT id="7"><A HREF="#lbAG">COLOPHON</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:53 GMT, March 31, 2021
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</BODY>
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</HTML>
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