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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_wait.html | |
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diff --git a/pthreads/manual/pthread_barrier_wait.html b/pthreads/manual/pthread_barrier_wait.html new file mode 100644 index 000000000..693d8bd15 --- /dev/null +++ b/pthreads/manual/pthread_barrier_wait.html @@ -0,0 +1,167 @@ +<!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_WAIT"(P) manual page</TITLE> + <META NAME="GENERATOR" CONTENT="OpenOffice.org 2.0 (Linux)"> + <META NAME="CREATED" CONTENT="20050504;11484200"> + <META NAME="CHANGEDBY" CONTENT="Ross Johnson"> + <META NAME="CHANGED" CONTENT="20060408;9504600"> + <!-- 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_wait - synchronize at a barrier (<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_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><pthread.h></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 Std 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="#toc11" NAME="sect11">Known Bugs</A></H2> +<DL> + <DD STYLE="margin-left: 0cm; margin-bottom: 0.5cm">In + <B><SPAN LANG="en-GB">pthreads-win32</SPAN></B>, + <B>pthread_barrier_wait</B> 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">count</SPAN></I> parameter in + <A HREF="pthread_barrier_init.html"><B>pthread_barrier_init(3)</B></A>. + </DD></DL> +<H2> +<A HREF="#toc9" NAME="sect9">See Also</A></H2> +<P><A HREF="pthread_barrier_init.html"><B>pthread_barrier_destroy</B>(3)</A>, +<A HREF="pthread_barrier_init.html"><B>pthread_barrier_init(3)</B></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="#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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