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<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_condattr_getpshared, pthread_condattr_setpshared - get and | |
set the process-shared condition variable attributes | |
</P> | |
<H2><A HREF="#toc1" NAME="sect1">Synopsis</A></H2> | |
<P><B>#include <pthread.h> </B> | |
</P> | |
<P><B>int pthread_condattr_getpshared(const pthread_condattr_t | |
*restrict</B> <I>attr</I><B>, int *restrict</B> <I>pshared</I><B>); | |
<BR>int pthread_condattr_setpshared(pthread_condattr_t *</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_condattr_getpshared</B> function shall obtain the | |
value of the <I>process-shared</I> attribute from the attributes | |
object referenced by <I>attr</I>. The <B>pthread_condattr_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 is set to | |
<B>PTHREAD_PROCESS_SHARED</B> to permit a condition variable to be | |
operated upon by any thread that has access to the memory where the | |
condition variable is allocated, even if the condition variable is | |
allocated in memory that is shared by multiple processes. If the | |
<I>process-shared</I> attribute is <B>PTHREAD_PROCESS_PRIVATE</B>, | |
the condition variable shall only be operated upon by threads created | |
within the same process as the thread that initialized the condition | |
variable; if threads of differing processes attempt to operate on | |
such a condition variable, the behavior is undefined. The default | |
value of the attribute is <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 | |
that the process shared attribute is not supported.</P> | |
<H2><A HREF="#toc3" NAME="sect3">Return Value</A></H2> | |
<P>If successful, the <B>pthread_condattr_setpshared</B> function | |
shall return zero; otherwise, an error number shall be returned to | |
indicate the error. | |
</P> | |
<P>If successful, the <B>pthread_condattr_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> | |
<H2><A HREF="#toc4" NAME="sect4">Errors</A></H2> | |
<P>The <B>pthread_condattr_getpshared</B> and | |
<B>pthread_condattr_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_condattr_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>ENOSYS</B> | |
</DT><DD STYLE="margin-bottom: 0.5cm"> | |
The value specified by <I>attr</I> was <B>PTHREAD_PROCESS_SHARED</B> | |
(Pthreads-w32).</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><B>Pthreads-w32</B> defines <B>_POSIX_THREAD_PROCESS_SHARED</B> in | |
pthread.h as -1 to indicate that these routines are implemented and | |
may be used, but do not support the process shared option.</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_create.html"><B>pthread_create</B>(3)</A> <B>,</B> | |
<A HREF="pthread_cond_init.html"><B>pthread_cond_destroy</B>(3)</A> <B>,</B> | |
<A HREF="pthread_condattr_init.html"><B>pthread_condattr_destroy</B>(3)</A> | |
<B>,</B> <A HREF="pthread_mutex_init.html"><B>pthread_mutex_destroy</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> | |
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