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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_destroy, pthread_barrierattr_init - destroy
and initialize the barrier attributes object (<B>ADVANCED REALTIME
THREADS</B>)
</P>
<H2><A HREF="#toc1" NAME="sect1">Synopsis</A></H2>
<P><B>#include <pthread.h> </B>
</P>
<P>i<B>nt pthread_barrierattr_destroy(pthread_barrierattr_t *</B><I>attr</I><B>);
<BR>int pthread_barrierattr_init(pthread_barrierattr_t *</B><I>attr</I><B>);
</B>
</P>
<H2><A HREF="#toc2" NAME="sect2">Description</A></H2>
<P>The <B>pthread_barrierattr_destroy</B> function shall destroy a
barrier attributes object. A destroyed <I>attr</I> attributes object
can be reinitialized using <B>pthread_barrierattr_init</B> ; the
results of otherwise referencing the object after it has been
destroyed are undefined. An implementation may cause
<B>pthread_barrierattr_destroy</B> to set the object referenced by
<I>attr</I> to an invalid value.
</P>
<P>The <B>pthread_barrierattr_init</B> function shall initialize a
barrier attributes object <I>attr</I> with the default value for all
of the attributes defined by the implementation.
</P>
<P>Results are undefined if <B>pthread_barrierattr_init</B> is called
specifying an already initialized <I>attr</I> attributes object.
</P>
<P>After a barrier attributes object has been used to initialize one
or more barriers, any function affecting the attributes object
(including destruction) shall not affect any previously initialized
barrier.
</P>
<H2><A HREF="#toc3" NAME="sect3">Return Value</A></H2>
<P>If successful, the <B>pthread_barrierattr_destroy</B> and
<B>pthread_barrierattr_init</B> functions 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>The <B>pthread_barrierattr_destroy</B> function 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></DL>
<P>
The <B>pthread_barrierattr_init</B> function shall fail if:
</P>
<DL>
<DT><B>ENOMEM</B>
</DT><DD STYLE="margin-bottom: 0.5cm">
Insufficient memory exists to initialize the barrier attributes
object.
</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_destroy</B> and
<B>pthread_barrierattr_init</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> to indicate
that these routines are 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_barrierattr_setpshared.html"><B>pthread_barrierattr_getpshared</B>(3)</A>
<B>,</B> <A HREF="pthread_barrierattr_setpshared.html"><B>pthread_barrierattr_setpshared</B>(3)</A>
, the Base Definitions volume of IEEE Std 1003.1-2001,
<I><pthread.h></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>
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