242 lines
6.4 KiB
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242 lines
6.4 KiB
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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_SETINHERITSCHED</TITLE>
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</HEAD><BODY>
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<H1>PTHREAD_ATTR_SETINHERITSCHED</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_setinheritsched, pthread_attr_getinheritsched - set/get
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inherit-scheduler 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>#include <<A HREF="file:///usr/include/pthread.h">pthread.h</A>></B>
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<B>int pthread_attr_setinheritsched(pthread_attr_t *</B><I>attr</I><B>,</B>
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<B> int </B><I>inheritsched</I><B>);</B>
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<B>int pthread_attr_getinheritsched(const pthread_attr_t *</B><I>attr</I><B>,</B>
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<B> int *</B><I>inheritsched</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_setinheritsched</B>()
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function sets the inherit-scheduler 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>inheritsched</I>.
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The inherit-scheduler attribute determines whether a thread created using
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the thread attributes object
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<I>attr</I>
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will inherit its scheduling attributes from the calling thread
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or whether it will take them from
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<I>attr</I>.
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<P>
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The following scheduling attributes are affected by the
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inherit-scheduler attribute:
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scheduling policy
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(<B><A HREF="/cgi-bin/man/man2html?3+pthread_attr_setschedpolicy">pthread_attr_setschedpolicy</A></B>(3)),
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scheduling priority
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(<B><A HREF="/cgi-bin/man/man2html?3+pthread_attr_setschedparam">pthread_attr_setschedparam</A></B>(3)),
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and contention scope
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(<B><A HREF="/cgi-bin/man/man2html?3+pthread_attr_setscope">pthread_attr_setscope</A></B>(3)).
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<P>
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The following values may be specified in
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<I>inheritsched</I>:
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<DL COMPACT>
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<DT id="1"><B>PTHREAD_INHERIT_SCHED</B>
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<DD>
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Threads that are created using
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<I>attr</I>
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inherit scheduling attributes from the creating thread;
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the scheduling attributes in
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<I>attr</I>
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are ignored.
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<DT id="2"><B>PTHREAD_EXPLICIT_SCHED</B>
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<DD>
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Threads that are created using
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<I>attr</I>
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take their scheduling attributes from the values specified
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by the attributes object.
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</DL>
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<P>
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The default setting of the inherit-scheduler attribute in
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a newly initialized thread attributes object is
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<B>PTHREAD_INHERIT_SCHED</B>.
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<P>
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The
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<B>pthread_attr_getinheritsched</B>()
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returns the inherit-scheduler attribute of the thread attributes object
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<I>attr</I>
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in the buffer pointed to by
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<I>inheritsched</I>.
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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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<B>pthread_attr_setinheritsched</B>()
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can fail with the following error:
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<DL COMPACT>
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<DT id="3"><B>EINVAL</B>
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<DD>
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Invalid value in
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<I>inheritsched</I>.
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</DL>
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<P>
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POSIX.1 also documents an optional
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<B>ENOTSUP</B>
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error ("attempt was made to set the attribute to an unsupported value") for
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<B>pthread_attr_setinheritsched</B>().
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<A NAME="lbAG"> </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_setinheritsched</B>(),
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<B>pthread_attr_getinheritsched</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="lbAH"> </A>
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<H2>CONFORMING TO</H2>
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POSIX.1-2001, POSIX.1-2008.
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<A NAME="lbAI"> </A>
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<H2>BUGS</H2>
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As at glibc 2.8, if a thread attributes object is initialized using
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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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then the scheduling policy of the attributes object is set to
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<B>SCHED_OTHER</B>
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and the scheduling priority is set to 0.
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However, if the inherit-scheduler attribute is then set to
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<B>PTHREAD_EXPLICIT_SCHED</B>,
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then a thread created using the attribute object
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wrongly inherits its scheduling attributes from the creating thread.
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This bug does not occur if either the scheduling policy or
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scheduling priority attribute is explicitly set
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in the thread attributes object before calling
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<B><A HREF="/cgi-bin/man/man2html?3+pthread_create">pthread_create</A></B>(3).
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<A NAME="lbAJ"> </A>
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<H2>EXAMPLE</H2>
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See
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<B><A HREF="/cgi-bin/man/man2html?3+pthread_setschedparam">pthread_setschedparam</A></B>(3).
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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?3+pthread_attr_init">pthread_attr_init</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+pthread_attr_setschedparam">pthread_attr_setschedparam</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+pthread_attr_setschedpolicy">pthread_attr_setschedpolicy</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+pthread_attr_setscope">pthread_attr_setscope</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+pthread_create">pthread_create</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+pthread_setschedparam">pthread_setschedparam</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+pthread_setschedprio">pthread_setschedprio</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?7+pthreads">pthreads</A></B>(7),
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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="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">ATTRIBUTES</A><DD>
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<DT id="10"><A HREF="#lbAH">CONFORMING TO</A><DD>
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<DT id="11"><A HREF="#lbAI">BUGS</A><DD>
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<DT id="12"><A HREF="#lbAJ">EXAMPLE</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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