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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_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> | |
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