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+ <TITLE>&quot;PTHREAD_BARRIER_WAIT&quot;(P) manual page</TITLE>
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+<BODY LANG="en-GB" BGCOLOR="#ffffff" DIR="LTR">
+<P><A HREF="#toc">Table of Contents</A></P>
+<H2><A HREF="#toc0" NAME="sect0">Name</A></H2>
+<P>pthread_barrier_wait - synchronize at a barrier (<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_barrier_wait(pthread_barrier_t *</B><I>barrier</I><B>);
+</B>
+</P>
+<H2><A HREF="#toc2" NAME="sect2">Description</A></H2>
+<P>The <B>pthread_barrier_wait</B> function shall synchronize
+participating threads at the barrier referenced by <I>barrier</I>.
+The calling thread shall block until the required number of threads
+have called <B>pthread_barrier_wait</B> specifying the barrier.
+</P>
+<P>When the required number of threads have called
+<B>pthread_barrier_wait</B> specifying the barrier, the constant
+<B>PTHREAD_BARRIER_SERIAL_THREAD</B> shall be returned to one
+unspecified thread and zero shall be returned to each of the
+remaining threads. At this point, the barrier shall be reset to the
+state it had as a result of the most recent <A HREF="pthread_barrier_init.html"><B>pthread_barrier_init</B>(3)</A>
+function that referenced it.
+</P>
+<P>The constant <B>PTHREAD_BARRIER_SERIAL_THREAD</B> is defined in
+<I>&lt;pthread.h&gt;</I> and its value shall be distinct from any
+other value returned by <B>pthread_barrier_wait</B> .
+</P>
+<P>The results are undefined if this function is called with an
+uninitialized barrier.
+</P>
+<P>If a signal is delivered to a thread blocked on a barrier, upon
+return from the signal handler the thread shall resume waiting at the
+barrier if the barrier wait has not completed (that is, if the
+required number of threads have not arrived at the barrier during the
+execution of the signal handler); otherwise, the thread shall
+continue as normal from the completed barrier wait. Until the thread
+in the signal handler returns from it, it is unspecified whether
+other threads may proceed past the barrier once they have all reached
+it.
+</P>
+<P>A thread that has blocked on a barrier shall not prevent any
+unblocked thread that is eligible to use the same processing
+resources from eventually making forward progress in its execution.
+Eligibility for processing resources shall be determined by the
+scheduling policy.
+</P>
+<H2><A HREF="#toc3" NAME="sect3">Return Value</A></H2>
+<P>Upon successful completion, the <B>pthread_barrier_wait</B>
+function shall return <B>PTHREAD_BARRIER_SERIAL_THREAD</B> for a
+single (arbitrary) thread synchronized at the barrier and zero for
+each of the other threads. Otherwise, an error number shall be
+returned to indicate the error.
+</P>
+<H2><A HREF="#toc4" NAME="sect4">Errors</A></H2>
+<P>The <B>pthread_barrier_wait</B> function may fail if:
+</P>
+<DL>
+ <DT><B>EINVAL</B>
+ </DT><DD STYLE="margin-bottom: 0.5cm">
+ The value specified by <I>barrier</I> does not refer to an
+ initialized barrier object.
+ </DD></DL>
+<P>
+This function 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>Applications using this function may be subject to priority
+inversion, as discussed in the Base Definitions volume of
+IEEE&nbsp;Std&nbsp;1003.1-2001, Section 3.285, Priority Inversion.
+</P>
+<P>The <B>pthread_barrier_wait</B> function is part of the Barriers
+option and need not be provided on all implementations.
+</P>
+<P><B>Pthreads-w32</B> defines <B>_POSIX_BARRIERS</B> to indicate
+that this routine is implemented and may be used.</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> 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>