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authormarha <marha@users.sourceforge.net>2009-06-28 22:07:26 +0000
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+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
+<HTML>
+<HEAD>
+ <META HTTP-EQUIV="CONTENT-TYPE" CONTENT="text/html; charset=utf-8">
+ <TITLE>&quot;PTHREAD_BARRIER_DESTROY&quot;(P) manual page</TITLE>
+ <META NAME="GENERATOR" CONTENT="OpenOffice.org 2.0 (Linux)">
+ <META NAME="CREATED" CONTENT="20050504;11372800">
+ <META NAME="CHANGEDBY" CONTENT="Ross Johnson">
+ <META NAME="CHANGED" CONTENT="20060408;9450100">
+ <!-- manual page source format generated by PolyglotMan v3.2, -->
+ <!-- available at http://polyglotman.sourceforge.net/ -->
+</HEAD>
+<BODY LANG="en-GB" BGCOLOR="#ffffff" DIR="LTR">
+<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_barrier_destroy, pthread_barrier_init - destroy and
+initialize a barrier 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_barrier_destroy(pthread_barrier_t *</B><I>barrier</I><B>);
+<BR>int pthread_barrier_init(pthread_barrier_t *restrict</B> <I>barrier</I><B>,
+const pthread_barrierattr_t *restrict</B> <I>attr</I><B>, unsigned</B>
+<I>count</I><B>); </B>
+</P>
+<H2><A HREF="#toc2" NAME="sect2">Description</A></H2>
+<P>The <B>pthread_barrier_destroy</B> function shall destroy the
+barrier referenced by <I>barrier</I> and release any resources used
+by the barrier. The effect of subsequent use of the barrier is
+undefined until the barrier is reinitialized by another call to
+<B>pthread_barrier_init</B> . An implementation may use this function
+to set <I>barrier</I> to an invalid value. The results are undefined
+if <B>pthread_barrier_destroy</B> is called when any thread is
+blocked on the barrier, or if this function is called with an
+uninitialized barrier.
+</P>
+<P>The <B>pthread_barrier_init</B> function shall allocate any
+resources required to use the barrier referenced by <I>barrier</I>
+and shall initialize the barrier with attributes referenced by <I>attr</I>.
+If <I>attr</I> is NULL, the default barrier attributes shall be used;
+the effect is the same as passing the address of a default barrier
+attributes object. The results are undefined if <B>pthread_barrier_init</B>
+is called when any thread is blocked on the barrier (that is, has not
+returned from the <A HREF="pthread_barrier_wait.html"><B>pthread_barrier_wait</B>(3)</A>
+call). The results are undefined if a barrier is used without first
+being initialized. The results are undefined if <B>pthread_barrier_init</B>
+is called specifying an already initialized barrier.
+</P>
+<P>The <I>count</I> argument specifies the number of threads that
+must call <A HREF="pthread_barrier_wait.html"><B>pthread_barrier_wait</B>(3)</A>
+before any of them successfully return from the call. The value
+specified by <I>count</I> must be greater than zero.
+</P>
+<P>If the <B>pthread_barrier_init</B> function fails, the barrier
+shall not be initialized and the contents of <I>barrier</I> are
+undefined.
+</P>
+<P>Only the object referenced by <I>barrier</I> may be used for
+performing synchronization. The result of referring to copies of that
+object in calls to <B>pthread_barrier_destroy</B> <B>or</B>
+<A HREF="pthread_barrier_wait.html"><B>pthread_barrier_wait</B>(3)</A>
+is undefined.</P>
+<H2><A HREF="#toc3" NAME="sect3">Return Value</A></H2>
+<P>Upon successful completion, these 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_barrier_destroy</B> function may fail if:
+</P>
+<DL>
+ <DT><B>EBUSY</B>
+ </DT><DD>
+ The implementation has detected an attempt to destroy a barrier
+ while it is in use (for example, while being used in a
+ <A HREF="pthread_barrier_wait.html"><B>pthread_barrier_wait</B>(3)</A>
+ call) by another thread.
+ </DD><DT>
+ <B>EINVAL</B>
+ </DT><DD STYLE="margin-bottom: 0.5cm">
+ The value specified by <I>barrier</I> is invalid.
+ </DD></DL>
+<P>
+The <B>pthread_barrier_init</B> function shall fail if:
+</P>
+<DL>
+ <DT><B>EAGAIN</B>
+ </DT><DD>
+ The system lacks the necessary resources to initialize another
+ barrier.
+ </DD><DT>
+ <B>EINVAL</B>
+ </DT><DD>
+ The value specified by <I>count</I> is equal to zero.
+ </DD><DT>
+ <B>ENOMEM</B>
+ </DT><DD STYLE="margin-bottom: 0.5cm">
+ Insufficient memory exists to initialize the barrier.
+ </DD></DL>
+<P>
+The <B>pthread_barrier_init</B> function may fail if:
+</P>
+<DL>
+ <DT><B>EBUSY</B>
+ </DT><DD>
+ The implementation has detected an attempt to reinitialize a barrier
+ while it is in use (for example, while being used in a
+ <A HREF="pthread_barrier_wait.html"><B>pthread_barrier_wait</B>(3)</A>
+ call) by another thread.
+ </DD><DT>
+ <B>EINVAL</B>
+ </DT><DD STYLE="margin-bottom: 0.5cm">
+ The value specified by <I>attr</I> is invalid.
+ </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_barrier_destroy</B> and <B>pthread_barrier_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="#toc11" NAME="sect11">Known Bugs</A></H2>
+<DL>
+ <DD STYLE="margin-left: 0cm; margin-bottom: 0.5cm">In
+ <B><SPAN LANG="en-GB"><SPAN LANG="en-GB">pthreads-win32</SPAN></SPAN></B>,
+ <A HREF="pthread_barrier_wait.html"></A><A HREF="pthread_barrier_wait.html"><B>pthread_barrier_wait</B>(3)</A><A HREF="pthread_barrier_wait.html"></A>
+ may deadlock if the number of running threads able to wait on the
+ barrier object exceeds the value given as the <I><SPAN LANG="en-GB"><SPAN LANG="en-GB">count</SPAN></SPAN></I>
+ parameter in <B>pthread_barrier_init</B>.
+ </DD></DL>
+<H2>
+<A HREF="#toc9" NAME="sect9">See Also</A></H2>
+<P><A HREF="pthread_barrier_wait.html"><B>pthread_barrier_wait</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="#sect11" NAME="toc11">Known
+ Bugs</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> \ No newline at end of file