168 lines
3.5 KiB
HTML
168 lines
3.5 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 SCHED_GETCPU</TITLE>
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</HEAD><BODY>
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<H1>SCHED_GETCPU</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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sched_getcpu - determine CPU on which the calling thread is running
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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/sched.h">sched.h</A>></B>
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<B>int sched_getcpu(void);</B>
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</PRE>
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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>sched_getcpu</B>():
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<DL COMPACT><DT id="1"><DD>
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<DL COMPACT>
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<DT id="2">Since glibc 2.14:<DD>
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_GNU_SOURCE
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<DT id="3">Before glibc 2.14:<DD>
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_BSD_SOURCE || _SVID_SOURCE
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<BR> /* _GNU_SOURCE also suffices */
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</DL>
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</DL>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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<B>sched_getcpu</B>()
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returns the number of the CPU on which the calling thread is currently executing.
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<A NAME="lbAE"> </A>
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<H2>RETURN VALUE</H2>
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On success,
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<B>sched_getcpu</B>()
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returns a nonnegative CPU number.
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On error, -1 is returned and
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<I>errno</I>
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is set to indicate the error.
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<A NAME="lbAF"> </A>
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<H2>ERRORS</H2>
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<DL COMPACT>
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<DT id="4"><B>ENOSYS</B>
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<DD>
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This kernel does not implement
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<B><A HREF="/cgi-bin/man/man2html?2+getcpu">getcpu</A></B>(2).
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</DL>
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<A NAME="lbAG"> </A>
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<H2>VERSIONS</H2>
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This function is available since glibc 2.6.
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<A NAME="lbAH"> </A>
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<H2>ATTRIBUTES</H2>
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For an explanation of the terms used in this section, see
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<B><A HREF="/cgi-bin/man/man2html?7+attributes">attributes</A></B>(7).
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<TABLE BORDER>
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<TR VALIGN=top><TD><B>Interface</B></TD><TD><B>Attribute</B></TD><TD><B>Value</B><BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>sched_getcpu</B>()
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</TD><TD>Thread safety</TD><TD>MT-Safe<BR></TD></TR>
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</TABLE>
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<A NAME="lbAI"> </A>
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<H2>CONFORMING TO</H2>
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<B>sched_getcpu</B>()
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is glibc-specific.
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<A NAME="lbAJ"> </A>
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<H2>NOTES</H2>
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The call
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<P>
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cpu = sched_getcpu();
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<P>
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is equivalent to the following
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<B><A HREF="/cgi-bin/man/man2html?2+getcpu">getcpu</A></B>(2)
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call:
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<P>
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int c, s;
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s = getcpu(&c, NULL, NULL);
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cpu = (s == -1) ? s : c;
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<A NAME="lbAK"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?2+getcpu">getcpu</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?7+sched">sched</A></B>(7)
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<A NAME="lbAL"> </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="5"><A HREF="#lbAB">NAME</A><DD>
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<DT id="6"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="7"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="8"><A HREF="#lbAE">RETURN VALUE</A><DD>
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<DT id="9"><A HREF="#lbAF">ERRORS</A><DD>
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<DT id="10"><A HREF="#lbAG">VERSIONS</A><DD>
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<DT id="11"><A HREF="#lbAH">ATTRIBUTES</A><DD>
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<DT id="12"><A HREF="#lbAI">CONFORMING TO</A><DD>
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<DT id="13"><A HREF="#lbAJ">NOTES</A><DD>
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<DT id="14"><A HREF="#lbAK">SEE ALSO</A><DD>
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<DT id="15"><A HREF="#lbAL">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: 00:05:54 GMT, March 31, 2021
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