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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_barrierattr_getpshared, pthread_barrierattr_setpshared - | |
| get and set the process-shared attribute of the barrier attributes | |
| object (<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_barrierattr_getpshared(const pthread_barrierattr_t | |
| * restrict</B> <I>attr</I><B>, int *restrict</B> <I>pshared</I><B>); | |
| <BR>int pthread_barrierattr_setpshared(pthread_barrierattr_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_barrierattr_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_barrierattr_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 | |
| PTHREAD_PROCESS_SHARED to permit a barrier to be operated upon by any | |
| thread that has access to the memory where the barrier is allocated. | |
| If the <I>process-shared</I> attribute is PTHREAD_PROCESS_PRIVATE, | |
| the barrier shall only be operated upon by threads created within the | |
| same process as the thread that initialized the barrier; if threads | |
| of different processes attempt to operate on such a barrier, the | |
| behavior is undefined. The default value of the attribute shall be | |
| PTHREAD_PROCESS_PRIVATE. Both constants PTHREAD_PROCESS_SHARED and | |
| PTHREAD_PROCESS_PRIVATE are defined in <I><pthread.h></I>. | |
| </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> | |
| <P>Additional attributes, their default values, and the names of the | |
| associated functions to get and set those attribute values are | |
| implementation-defined. | |
| </P> | |
| <H2><A HREF="#toc3" NAME="sect3">Return Value</A></H2> | |
| <P>If successful, the <B>pthread_barrierattr_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_barrierattr_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>These 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><DT> | |
| The <B>pthread_barrierattr_setpshared</B> function may fail if: | |
| </DT><DT> | |
| <B>EINVAL</B> | |
| </DT><DD STYLE="margin-bottom: 0.5cm"> | |
| The new value specified for the <I>process-shared</I> attribute is | |
| not one of the legal values <B>PTHREAD_PROCESS_SHARED</B> or | |
| <B>PTHREAD_PROCESS_PRIVATE</B>. | |
| </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>The <B>pthread_barrierattr_getpshared</B> and | |
| <B>pthread_barrierattr_setpshared</B> functions are part of the | |
| Barriers option and need not be provided on all implementations. | |
| </P> | |
| <P><B>Pthreads-w32</B> defines <B>_POSIX_BARRIERS</B> and | |
| <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_barrier_init.html"><B>pthread_barrier_destroy</B>(3)</A> | |
| <B>,</B> <A HREF="pthread_barrierattr_init.html"><B>pthread_barrierattr_destroy</B>(3)</A> | |
| <B>,</B> <A HREF="pthread_barrierattr_init.html"><B>pthread_barrierattr_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> | |
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