156 lines
3.9 KiB
HTML
156 lines
3.9 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_MUTEXATTR_GETPSHARED</TITLE>
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</HEAD><BODY>
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<H1>PTHREAD_MUTEXATTR_GETPSHARED</H1>
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Section: Linux Programmer's Manual (3)<BR>Updated: 2017-09-13<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_mutexattr_getpshared, pthread_mutexattr_setpshared - get/set
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process-shared mutex attribute
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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_mutexattr_getpshared(const pthread_mutexattr_t *</B><I>attr</I><B>,</B>
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<B> int *</B><I>pshared</I><B>);</B>
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<B>int pthread_mutexattr_setpshared(pthread_mutexattr_t *</B><I>attr</I><B>,</B>
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<B> int </B><I>pshared</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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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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These functions get and set the process-shared attribute
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in a mutex attributes object.
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This attribute must be appropriately set to ensure correct,
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efficient operation of a mutex created using this attributes object.
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<P>
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The process-shared attribute can have one of the following values:
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<DL COMPACT>
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<DT id="1"><B>PTHREAD_PROCESS_PRIVATE</B>
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<DD>
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Mutexes created with this attributes object are to be shared
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only among threads in the same process that initialized the mutex.
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This is the default value for the process-shared mutex attribute.
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<DT id="2"><B>PTHREAD_PROCESS_SHARED</B>
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<DD>
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Mutexes created with this attributes object can be shared between
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any threads that have access to the memory containing the object,
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including threads in different processes.
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</DL>
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<P>
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<B>pthread_mutexattr_getpshared</B>()
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places the value of the process-shared attribute of
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the mutex attributes object referred to by
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<I>attr</I>
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in the location pointed to by
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<I>pshared</I>.
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<P>
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<B>pthread_mutexattr_setpshared</B>()
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sets the value of the process-shared attribute of
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the mutex 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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<B>pshared</B>.
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<P>
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If
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<I>attr</I>
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does not refer to an initialized mutex attributes object,
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the behavior is undefined.
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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 positive error number.
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<A NAME="lbAF"> </A>
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<H2>ERRORS</H2>
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<B>pthread_mutexattr_setpshared</B>()
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can fail with the following errors:
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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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The value specified in
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<I>pshared</I>
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is invalid.
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<DT id="4"><B>ENOTSUP</B>
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<DD>
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<I>pshared is</I>
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<B>PTHREAD_PROCESS_SHARED</B>
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but the implementation does not support process-shared mutexes.
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</DL>
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<A NAME="lbAG"> </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="lbAH"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?3+pthread_mutexattr_init">pthread_mutexattr_init</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="lbAI"> </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">CONFORMING TO</A><DD>
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<DT id="11"><A HREF="#lbAH">SEE ALSO</A><DD>
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<DT id="12"><A HREF="#lbAI">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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