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+	<TITLE>&quot;PTHREAD_BARRIERATTR_GETPSHARED&quot;(P) manual page</TITLE>
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+<H4>POSIX Threads for Windows – REFERENCE - <A HREF="http://sources.redhat.com/pthreads-win32">Pthreads-w32</A></H4>
+<P><A HREF="index.html">Reference Index</A></P>
+<P><A HREF="#toc">Table of Contents</A></P>
+<H2><A HREF="#toc0" NAME="sect0">Name</A></H2>
+<P>pthread_barrierattr_getpshared, pthread_barrierattr_setpshared -
+get and set the process-shared attribute of the barrier attributes
+object (<B>ADVANCED REALTIME THREADS</B>) 
+</P>
+<H2><A HREF="#toc1" NAME="sect1">Synopsis</A></H2>
+<P><B>#include &lt;pthread.h&gt; </B>
+</P>
+<P><B>int pthread_barrierattr_getpshared(const pthread_barrierattr_t
+* restrict</B> <I>attr</I><B>, int *restrict</B> <I>pshared</I><B>);
+<BR>int pthread_barrierattr_setpshared(pthread_barrierattr_t *</B><I>attr</I><B>,
+int</B> <I>pshared</I><B>); </B>
+</P>
+<H2><A HREF="#toc2" NAME="sect2">Description</A></H2>
+<P>The <B>pthread_barrierattr_getpshared</B> function shall obtain
+the value of the <I>process-shared</I> attribute from the attributes
+object referenced by <I>attr</I>. The <B>pthread_barrierattr_setpshared</B>
+function shall set the <I>process-shared</I> attribute in an
+initialized attributes object referenced by <I>attr</I>. 
+</P>
+<P>The <I>process-shared</I> attribute is set to
+PTHREAD_PROCESS_SHARED to permit a barrier to be operated upon by any
+thread that has access to the memory where the barrier is allocated.
+If the <I>process-shared</I> attribute is PTHREAD_PROCESS_PRIVATE,
+the barrier shall only be operated upon by threads created within the
+same process as the thread that initialized the barrier; if threads
+of different processes attempt to operate on such a barrier, the
+behavior is undefined. The default value of the attribute shall be
+PTHREAD_PROCESS_PRIVATE. Both constants PTHREAD_PROCESS_SHARED and
+PTHREAD_PROCESS_PRIVATE are defined in <I>&lt;pthread.h&gt;</I>. 
+</P>
+<P><B>Pthreads-w32</B> defines _<B>POSIX_THREAD_PROCESS_SHARED</B> in
+pthread.h as -1 to indicate that these routines are implemented but
+that the process shared attribute is not supported.</P>
+<P>Additional attributes, their default values, and the names of the
+associated functions to get and set those attribute values are
+implementation-defined. 
+</P>
+<H2><A HREF="#toc3" NAME="sect3">Return Value</A></H2>
+<P>If successful, the <B>pthread_barrierattr_getpshared</B> function
+shall return zero and store the value of the <I>process-shared</I>
+attribute of <I>attr</I> into the object referenced by the <I>pshared</I>
+parameter. Otherwise, an error number shall be returned to indicate
+the error. 
+</P>
+<P>If successful, the <B>pthread_barrierattr_setpshared</B> function
+shall return zero; otherwise, an error number shall be returned to
+indicate the error. 
+</P>
+<H2><A HREF="#toc4" NAME="sect4">Errors</A></H2>
+<P>These functions may fail if: 
+</P>
+<DL>
+	<DT><B>EINVAL</B> 
+	</DT><DD STYLE="margin-bottom: 0.5cm">
+	The value specified by <I>attr</I> is invalid. 
+	</DD><DT>
+	The <B>pthread_barrierattr_setpshared</B> function may fail if: 
+	</DT><DT>
+	<B>EINVAL</B> 
+	</DT><DD STYLE="margin-bottom: 0.5cm">
+	The new value specified for the <I>process-shared</I> attribute is
+	not one of the legal values <B>PTHREAD_PROCESS_SHARED</B> or
+	<B>PTHREAD_PROCESS_PRIVATE</B>. 
+	</DD><DT>
+	<B>ENOSYS</B> 
+	</DT><DD STYLE="margin-bottom: 0.5cm">
+	The value specified by <I>attr</I> was <B>PTHREAD_PROCESS_SHARED</B>
+	(Pthreads-w32).</DD></DL>
+<P>
+These functions shall not return an error code of [EINTR]. 
+</P>
+<P><I>The following sections are informative.</I> 
+</P>
+<H2><A HREF="#toc5" NAME="sect5">Examples</A></H2>
+<P>None. 
+</P>
+<H2><A HREF="#toc6" NAME="sect6">Application Usage</A></H2>
+<P>The <B>pthread_barrierattr_getpshared</B> and
+<B>pthread_barrierattr_setpshared</B> functions are part of the
+Barriers option and need not be provided on all implementations. 
+</P>
+<P><B>Pthreads-w32</B> defines <B>_POSIX_BARRIERS</B> and
+<B>_POSIX_THREAD_PROCESS_SHARED</B> in pthread.h as -1 to indicate
+that these routines are implemented and may be used, but do not
+support the process shared option.</P>
+<H2><A HREF="#toc7" NAME="sect7">Rationale</A></H2>
+<P>None. 
+</P>
+<H2><A HREF="#toc8" NAME="sect8">Future Directions</A></H2>
+<P>None. 
+</P>
+<H2><A HREF="#toc9" NAME="sect9">See Also</A></H2>
+<P><A HREF="pthread_barrier_init.html"><B>pthread_barrier_destroy</B>(3)</A>
+<B>,</B> <A HREF="pthread_barrierattr_init.html"><B>pthread_barrierattr_destroy</B>(3)</A>
+<B>,</B> <A HREF="pthread_barrierattr_init.html"><B>pthread_barrierattr_init</B>(3)</A>
+<B>,</B> the Base Definitions volume of IEEE&nbsp;Std&nbsp;1003.1-2001,
+<I>&lt;pthread.h&gt;</I> 
+</P>
+<H2><A HREF="#toc10" NAME="sect10">Copyright</A></H2>
+<P>Portions of this text are reprinted and reproduced in electronic
+form from IEEE Std 1003.1, 2003 Edition, Standard for Information
+Technology -- Portable Operating System Interface (POSIX), The Open
+Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the
+Institute of Electrical and Electronics Engineers, Inc and The Open
+Group. In the event of any discrepancy between this version and the
+original IEEE and The Open Group Standard, the original IEEE and The
+Open Group Standard is the referee document. The original Standard
+can be obtained online at <A HREF="http://www.opengroup.org/unix/online.html">http://www.opengroup.org/unix/online.html</A>
+. 
+</P>
+<P>Modified by Ross Johnson for use with <A HREF="http://sources.redhat.com/pthreads-win32">Pthreads-w32</A>.</P>
+<HR>
+<P><A NAME="toc"></A><B>Table of Contents</B></P>
+<UL>
+	<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect0" NAME="toc0">Name</A>
+		</P>
+	<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect1" NAME="toc1">Synopsis</A>
+		</P>
+	<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect2" NAME="toc2">Description</A>
+		</P>
+	<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect3" NAME="toc3">Return
+	Value</A> 
+	</P>
+	<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect4" NAME="toc4">Errors</A>
+		</P>
+	<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect5" NAME="toc5">Examples</A>
+		</P>
+	<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect6" NAME="toc6">Application
+	Usage</A> 
+	</P>
+	<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect7" NAME="toc7">Rationale</A>
+		</P>
+	<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect8" NAME="toc8">Future
+	Directions</A> 
+	</P>
+	<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect9" NAME="toc9">See
+	Also</A> 
+	</P>
+	<LI><P><A HREF="#sect10" NAME="toc10">Copyright</A> 
+	</P>
+</UL>
+</BODY>
+</HTML>