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| author | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
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| committer | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
| commit | 3562e78743202e43aec8727005182a2558117eca (patch) | |
| tree | 8f9113a77d12470c5c851a2a8e4cb02e89df7d43 /pthreads/manual/pthread_barrier_init.html | |
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diff --git a/pthreads/manual/pthread_barrier_init.html b/pthreads/manual/pthread_barrier_init.html new file mode 100644 index 000000000..065c1296f --- /dev/null +++ b/pthreads/manual/pthread_barrier_init.html @@ -0,0 +1,200 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> +<HTML> +<HEAD> + <META HTTP-EQUIV="CONTENT-TYPE" CONTENT="text/html; charset=utf-8"> + <TITLE>"PTHREAD_BARRIER_DESTROY"(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 <pthread.h> </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 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="#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>
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