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160 lines
6.9 KiB
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<TITLE>"PTHREAD_BARRIERATTR_GETPSHARED"(P) manual page</TITLE>
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<BODY LANG="en-GB" BGCOLOR="#ffffff" DIR="LTR">
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<H4>POSIX Threads for Windows – REFERENCE - <A HREF="http://sources.redhat.com/pthreads-win32">Pthreads-w32</A></H4>
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<P><A HREF="index.html">Reference Index</A></P>
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<P><A HREF="#toc">Table of Contents</A></P>
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<H2><A HREF="#toc0" NAME="sect0">Name</A></H2>
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<P>pthread_barrierattr_getpshared, pthread_barrierattr_setpshared -
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get and set the process-shared attribute of the barrier attributes
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object (<B>ADVANCED REALTIME THREADS</B>)
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</P>
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<H2><A HREF="#toc1" NAME="sect1">Synopsis</A></H2>
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<P><B>#include <pthread.h> </B>
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</P>
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<P><B>int pthread_barrierattr_getpshared(const pthread_barrierattr_t
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* restrict</B> <I>attr</I><B>, int *restrict</B> <I>pshared</I><B>);
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<BR>int pthread_barrierattr_setpshared(pthread_barrierattr_t *</B><I>attr</I><B>,
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int</B> <I>pshared</I><B>); </B>
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</P>
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<H2><A HREF="#toc2" NAME="sect2">Description</A></H2>
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<P>The <B>pthread_barrierattr_getpshared</B> function shall obtain
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the value of the <I>process-shared</I> attribute from the attributes
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object referenced by <I>attr</I>. The <B>pthread_barrierattr_setpshared</B>
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function shall set the <I>process-shared</I> attribute in an
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initialized attributes object referenced by <I>attr</I>.
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</P>
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<P>The <I>process-shared</I> attribute is set to
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PTHREAD_PROCESS_SHARED to permit a barrier to be operated upon by any
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thread that has access to the memory where the barrier is allocated.
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If the <I>process-shared</I> attribute is PTHREAD_PROCESS_PRIVATE,
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the barrier shall only be operated upon by threads created within the
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same process as the thread that initialized the barrier; if threads
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of different processes attempt to operate on such a barrier, the
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behavior is undefined. The default value of the attribute shall be
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PTHREAD_PROCESS_PRIVATE. Both constants PTHREAD_PROCESS_SHARED and
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PTHREAD_PROCESS_PRIVATE are defined in <I><pthread.h></I>.
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</P>
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<P><B>Pthreads-w32</B> defines _<B>POSIX_THREAD_PROCESS_SHARED</B> in
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pthread.h as -1 to indicate that these routines are implemented but
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that the process shared attribute is not supported.</P>
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<P>Additional attributes, their default values, and the names of the
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associated functions to get and set those attribute values are
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implementation-defined.
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</P>
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<H2><A HREF="#toc3" NAME="sect3">Return Value</A></H2>
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<P>If successful, the <B>pthread_barrierattr_getpshared</B> function
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shall return zero and store the value of the <I>process-shared</I>
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attribute of <I>attr</I> into the object referenced by the <I>pshared</I>
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parameter. Otherwise, an error number shall be returned to indicate
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the error.
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</P>
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<P>If successful, the <B>pthread_barrierattr_setpshared</B> function
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shall return zero; otherwise, an error number shall be returned to
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indicate the error.
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</P>
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<H2><A HREF="#toc4" NAME="sect4">Errors</A></H2>
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<P>These functions may fail if:
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</P>
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<DL>
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<DT><B>EINVAL</B>
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</DT><DD STYLE="margin-bottom: 0.5cm">
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The value specified by <I>attr</I> is invalid.
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</DD><DT>
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The <B>pthread_barrierattr_setpshared</B> function may fail if:
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</DT><DT>
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<B>EINVAL</B>
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</DT><DD STYLE="margin-bottom: 0.5cm">
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The new value specified for the <I>process-shared</I> attribute is
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not one of the legal values <B>PTHREAD_PROCESS_SHARED</B> or
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<B>PTHREAD_PROCESS_PRIVATE</B>.
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</DD><DT>
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<B>ENOSYS</B>
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</DT><DD STYLE="margin-bottom: 0.5cm">
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The value specified by <I>attr</I> was <B>PTHREAD_PROCESS_SHARED</B>
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(Pthreads-w32).</DD></DL>
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<P>
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These functions shall not return an error code of [EINTR].
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</P>
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<P><I>The following sections are informative.</I>
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</P>
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<H2><A HREF="#toc5" NAME="sect5">Examples</A></H2>
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<P>None.
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</P>
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<H2><A HREF="#toc6" NAME="sect6">Application Usage</A></H2>
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<P>The <B>pthread_barrierattr_getpshared</B> and
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<B>pthread_barrierattr_setpshared</B> functions are part of the
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Barriers option and need not be provided on all implementations.
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</P>
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<P><B>Pthreads-w32</B> defines <B>_POSIX_BARRIERS</B> and
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<B>_POSIX_THREAD_PROCESS_SHARED</B> in pthread.h as -1 to indicate
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that these routines are implemented and may be used, but do not
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support the process shared option.</P>
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<H2><A HREF="#toc7" NAME="sect7">Rationale</A></H2>
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<P>None.
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</P>
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<H2><A HREF="#toc8" NAME="sect8">Future Directions</A></H2>
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<P>None.
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</P>
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<H2><A HREF="#toc9" NAME="sect9">See Also</A></H2>
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<P><A HREF="pthread_barrier_init.html"><B>pthread_barrier_destroy</B>(3)</A>
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<B>,</B> <A HREF="pthread_barrierattr_init.html"><B>pthread_barrierattr_destroy</B>(3)</A>
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<B>,</B> <A HREF="pthread_barrierattr_init.html"><B>pthread_barrierattr_init</B>(3)</A>
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<B>,</B> the Base Definitions volume of IEEE Std 1003.1-2001,
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<I><pthread.h></I>
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</P>
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<H2><A HREF="#toc10" NAME="sect10">Copyright</A></H2>
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<P>Portions of this text are reprinted and reproduced in electronic
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form from IEEE Std 1003.1, 2003 Edition, Standard for Information
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Technology -- Portable Operating System Interface (POSIX), The Open
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Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the
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Institute of Electrical and Electronics Engineers, Inc and The Open
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Group. In the event of any discrepancy between this version and the
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original IEEE and The Open Group Standard, the original IEEE and The
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Open Group Standard is the referee document. The original Standard
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can be obtained online at <A HREF="http://www.opengroup.org/unix/online.html">http://www.opengroup.org/unix/online.html</A>
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.
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</P>
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<P>Modified by Ross Johnson for use with <A HREF="http://sources.redhat.com/pthreads-win32">Pthreads-w32</A>.</P>
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<HR>
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<P><A NAME="toc"></A><B>Table of Contents</B></P>
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<UL>
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<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect0" NAME="toc0">Name</A>
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</P>
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<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect1" NAME="toc1">Synopsis</A>
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</P>
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<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect2" NAME="toc2">Description</A>
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</P>
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<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect3" NAME="toc3">Return
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Value</A>
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</P>
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<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect4" NAME="toc4">Errors</A>
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</P>
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<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect5" NAME="toc5">Examples</A>
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</P>
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<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect6" NAME="toc6">Application
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Usage</A>
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</P>
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<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect7" NAME="toc7">Rationale</A>
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</P>
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<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect8" NAME="toc8">Future
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Directions</A>
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</P>
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<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect9" NAME="toc9">See
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Also</A>
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</P>
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<LI><P><A HREF="#sect10" NAME="toc10">Copyright</A>
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</P>
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</UL>
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