213 lines
5.4 KiB
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213 lines
5.4 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_ATTR_SETAFFINITY_NP</TITLE>
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</HEAD><BODY>
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<H1>PTHREAD_ATTR_SETAFFINITY_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_attr_setaffinity_np, pthread_attr_getaffinity_np - set/get
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CPU affinity attribute in thread attributes object
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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>#define _GNU_SOURCE</B> /* See <A HREF="/cgi-bin/man/man2html?7+feature_test_macros">feature_test_macros</A>(7) */
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<B>#include <<A HREF="file:///usr/include/pthread.h">pthread.h</A>></B>
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<B>int pthread_attr_setaffinity_np(pthread_attr_t *</B><I>attr</I><B>,</B>
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<B> size_t </B><I>cpusetsize</I><B>, const cpu_set_t *</B><I>cpuset</I><B>);</B>
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<B>int pthread_attr_getaffinity_np(const pthread_attr_t *</B><I>attr</I><B>,</B>
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<B> size_t </B><I>cpusetsize</I><B>, cpu_set_t *</B><I>cpuset</I><B>);</B>
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Compile and link with <I>-pthread</I>.
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</PRE>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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The
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<B>pthread_attr_setaffinity_np</B>()
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function
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sets the CPU affinity mask attribute of the
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thread attributes object referred to by
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<I>attr</I>
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to the value specified in
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<I>cpuset</I>.
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This attribute determines the CPU affinity mask
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of a thread created using the thread attributes object
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<I>attr</I>.
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<P>
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The
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<B>pthread_attr_getaffinity_np</B>()
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function
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returns the CPU affinity mask attribute of the thread attributes object
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referred to by
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<I>attr</I>
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in the buffer pointed to by
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<I>cpuset</I>.
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<P>
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The argument
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<I>cpusetsize</I>
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is the length (in bytes) of the buffer pointed to by
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<I>cpuset</I>.
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Typically, this argument would be specified as
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<I>sizeof(cpu_set_t)</I>.
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<P>
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For more details on CPU affinity masks, see
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<B><A HREF="/cgi-bin/man/man2html?2+sched_setaffinity">sched_setaffinity</A></B>(2).
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For a description of a set of macros
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that can be used to manipulate and inspect CPU sets, see
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<B><A HREF="/cgi-bin/man/man2html?3+CPU_SET">CPU_SET</A></B>(3).
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<A NAME="lbAE"> </A>
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<H2>RETURN VALUE</H2>
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On success, these functions return 0;
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on error, they return a nonzero error number.
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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="1"><B>EINVAL</B>
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<DD>
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(<B>pthread_attr_setaffinity_np</B>())
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<I>cpuset</I>
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specified a CPU that was outside the set supported by the kernel.
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(The kernel configuration option
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<B>CONFIG_NR_CPUS</B>
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defines the range of the set supported by the kernel data type
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used to represent CPU sets.)
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<DT id="2"><B>EINVAL</B>
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<DD>
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(<B>pthread_attr_getaffinity_np</B>())
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A CPU in the affinity mask of the thread attributes object referred to by
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<I>attr</I>
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lies outside the range specified by
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<I>cpusetsize</I>
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(i.e.,
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<I>cpuset</I>/<I>cpusetsize</I>
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is too small).
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<DT id="3"><B>ENOMEM</B>
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<DD>
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(<B>pthread_attr_setaffinity_np</B>())
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Could not allocate memory.
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</DL>
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<A NAME="lbAG"> </A>
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<H2>VERSIONS</H2>
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These functions are provided by glibc since version 2.3.4.
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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>pthread_attr_setaffinity_np</B>(),
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<B>pthread_attr_getaffinity_np</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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<P>
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<A NAME="lbAI"> </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="lbAJ"> </A>
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<H2>NOTES</H2>
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In glibc 2.3.3 only,
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versions of these functions were provided that did not have a
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<I>cpusetsize</I>
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argument.
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Instead the CPU set size given to the underlying system calls was always
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<I>sizeof(cpu_set_t)</I>.
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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+sched_setaffinity">sched_setaffinity</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?3+pthread_attr_init">pthread_attr_init</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+pthread_setaffinity_np">pthread_setaffinity_np</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?7+cpuset">cpuset</A></B>(7),
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<B><A HREF="/cgi-bin/man/man2html?7+pthreads">pthreads</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="4"><A HREF="#lbAB">NAME</A><DD>
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<DT id="5"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="6"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="7"><A HREF="#lbAE">RETURN VALUE</A><DD>
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<DT id="8"><A HREF="#lbAF">ERRORS</A><DD>
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<DT id="9"><A HREF="#lbAG">VERSIONS</A><DD>
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<DT id="10"><A HREF="#lbAH">ATTRIBUTES</A><DD>
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<DT id="11"><A HREF="#lbAI">CONFORMING TO</A><DD>
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<DT id="12"><A HREF="#lbAJ">NOTES</A><DD>
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<DT id="13"><A HREF="#lbAK">SEE ALSO</A><DD>
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<DT id="14"><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: 00:05:53 GMT, March 31, 2021
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</BODY>
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</HTML>
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