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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_RWLOCKATTR_GETPSHARED&quot;(P) manual page</TITLE>
+ <META NAME="GENERATOR" CONTENT="OpenOffice.org 1.1.3 (Linux)">
+ <META NAME="CREATED" CONTENT="20050505;10124400">
+ <META NAME="CHANGED" CONTENT="20050505;12572100">
+ <!-- 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_rwlockattr_getpshared, pthread_rwlockattr_setpshared - get
+and set the process-shared attribute of the read-write lock
+attributes object
+</P>
+<H2><A HREF="#toc1" NAME="sect1">Synopsis</A></H2>
+<P><B>#include &lt;pthread.h&gt; </B>
+</P>
+<P><B>int pthread_rwlockattr_getpshared(const pthread_rwlockattr_t *
+restrict </B><I>attr</I><B>, int *restrict</B> <I>pshared</I><B>);
+<BR>int pthread_rwlockattr_setpshared(pthread_rwlockattr_t <I>*</I></B><I>attr</I><B>,
+int</B> <I>pshared</I><B>); </B>
+</P>
+<H2><A HREF="#toc2" NAME="sect2">Description</A></H2>
+<P>The <B>pthread_rwlockattr_getpshared</B> function shall obtain the
+value of the <I>process-shared</I> attribute from the initialized
+attributes object referenced by <I>attr</I>. The
+<B>pthread_rwlockattr_setpshared</B> function shall set the
+<I>process-shared</I> attribute in an initialized attributes object
+referenced by <I>attr</I>.
+</P>
+<P>The <I>process-shared</I> attribute shall be set to
+<B>PTHREAD_PROCESS_SHARED</B> to permit a read-write lock to be
+operated upon by any thread that has access to the memory where the
+read-write lock is allocated, even if the read-write lock is
+allocated in memory that is shared by multiple processes. If the
+<I>process-shared</I> attribute is <B>PTHREAD_PROCESS_PRIVATE</B>,
+the read-write lock shall only be operated upon by threads created
+within the same process as the thread that initialized the read-write
+lock; if threads of differing processes attempt to operate on such a
+read-write lock, the behavior is undefined. The default value of the
+<I>process-shared</I> attribute shall be <B>PTHREAD_PROCESS_PRIVATE</B>.
+</P>
+<P><B>Pthreads-w32</B> defines <B>_POSIX_THREAD_PROCESS_SHARED</B> in
+pthread.h as -1 to indicate that these routines are implemented but
+they do not support the process shared option.</P>
+<P>Additional attributes, their default values, and the names of the
+associated functions to get and set those attribute values are
+implementation-defined.
+</P>
+<P><B>Pthreads-w32</B> defines <B>_POSIX_READER_WRITER_LOCKS</B> in
+pthread.h as 200112L to indicate that the reader/writer routines are
+implemented and may be used.</P>
+<H2><A HREF="#toc3" NAME="sect3">Return Value</A></H2>
+<P>Upon successful completion, the <B>pthread_rwlockattr_getpshared</B>
+function shall return zero and store the value of the <I>process-shared</I>
+attribute of <I>attr</I> into the object referenced by the <I>pshared</I>
+parameter. Otherwise, an error number shall be returned to indicate
+the error.
+</P>
+<P>If successful, the <B>pthread_rwlockattr_setpshared</B> function
+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_rwlockattr_getpshared</B> and
+<B>pthread_rwlockattr_setpshared</B> functions 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_rwlockattr_setpshared</B> function may fail if:
+</P>
+<DL>
+ <DT><B>EINVAL</B>
+ </DT><DD STYLE="margin-bottom: 0.5cm">
+ The new value specified for the attribute is outside the range of
+ legal values for that attribute.
+ </DD><DT>
+ <B>ENOTSUP</B>
+ </DT><DD STYLE="margin-bottom: 0.5cm">
+ The new value specified for the attribute is <B>PTHREAD_PROCESS_SHARED</B>.
+ </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>None.
+</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_rwlock_init.html"><B>pthread_rwlock_destroy</B>(3)</A>
+<B>,</B> <A HREF="pthread_rwlockattr_init.html"><B>pthread_rwlockattr_destroy</B>(3)</A>
+<B>,</B> <A HREF="pthread_rwlockattr_init.html"><B>pthread_rwlockattr_init</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="#sect9" NAME="toc9">See
+ Also</A>
+ </P>
+ <LI><P><A HREF="#sect10" NAME="toc10">Copyright</A>
+ </P>
+</UL>
+</BODY>
+</HTML>