mirror of https://github.com/PCSX2/pcsx2.git
161 lines
6.6 KiB
HTML
161 lines
6.6 KiB
HTML
<!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>
|
||
None.</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> |