160 lines
6.7 KiB
HTML
160 lines
6.7 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_RWLOCKATTR_GETPSHARED"(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 <pthread.h> </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 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="#sect9" NAME="toc9">See
|
||
Also</A>
|
||
</P>
|
||
<LI><P><A HREF="#sect10" NAME="toc10">Copyright</A>
|
||
</P>
|
||
</UL>
|
||
</BODY>
|
||
</HTML>
|