<!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_ATTR_GETSTACKADDR"(P) manual page</TITLE> <META NAME="GENERATOR" CONTENT="OpenOffice.org 1.1.3 (Linux)"> <META NAME="CREATED" CONTENT="20050504;11025500"> <META NAME="CHANGED" CONTENT="20050505;17571400"> <!-- manual page source format generated by PolyglotMan v3.2, --> <!-- available at http://polyglotman.sourceforge.net/ --> </HEAD> <BODY LANG="en-GB" BGCOLOR="#ffffff" DIR="LTR"> <P><A HREF="#toc">Table of Contents</A></P> <H2><A HREF="#toc0" NAME="sect0">Name</A></H2> <P>pthread_attr_getstackaddr, pthread_attr_setstackaddr - get and set the stackaddr attribute </P> <H2><A HREF="#toc1" NAME="sect1">Synopsis</A></H2> <P><B>#include <pthread.h> </B> </P> <P><B>int pthread_attr_getstackaddr(const pthread_attr_t *restrict</B> <I>attr</I><B>, void **restrict</B> <I>stackaddr</I><B>); <BR>int pthread_attr_setstackaddr(pthread_attr_t *</B><I>attr</I><B>, void *</B><I>stackaddr</I><B>); </B> </P> <H2><A HREF="#toc2" NAME="sect2">Description</A></H2> <P>The <B>pthread_attr_getstackaddr</B> and <B>pthread_attr_setstackaddr</B> functions, respectively, shall get and set the thread creation <I>stackaddr</I> attribute in the <I>attr</I> object. </P> <P>The <I>stackaddr</I> attribute specifies the location of storage to be used for the created thread’s stack. The size of the storage shall be at least {PTHREAD_STACK_MIN}. </P> <P><B>Pthreads-w32</B> defines <B>_POSIX_THREAD_ATTR_STACKADDR</B> in pthread.h as -1 to indicate that these routines are implemented but cannot used to set or get the stack address. These routines always return the error ENOSYS when called.</P> <H2><A HREF="#toc3" NAME="sect3">Return Value</A></H2> <P>Upon successful completion, <B>pthread_attr_getstackaddr</B> and <B>pthread_attr_setstackaddr</B> shall return a value of 0; otherwise, an error number shall be returned to indicate the error. </P> <P>The <B>pthread_attr_getstackaddr</B> function stores the <I>stackaddr</I> attribute value in <I>stackaddr</I> if successful. </P> <H2><A HREF="#toc4" NAME="sect4">Errors</A></H2> <P>The <B>pthread_attr_setstackaddr</B> function always returns the following error code: </P> <DL> <DL> <DT STYLE="margin-right: 1cm; margin-bottom: 0.5cm"><B>ENOSYS</B></DT><DD STYLE="margin-right: 1cm; margin-bottom: 0.5cm"> The function is not supported. </DD></DL> </DL> <P> The <B>pthread_attr_getstackaddr</B> function always returns the following error code: </P> <DL> <DL> <DT STYLE="margin-right: 1cm; margin-bottom: 0.5cm"><B>ENOSYS</B></DT><DD STYLE="margin-right: 1cm; margin-bottom: 0.5cm"> The function is not supported. </DD></DL> </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 specification of the <I>stackaddr</I> attribute presents several ambiguities that make portable use of these interfaces impossible. The description of the single address parameter as a "stack" does not specify a particular relationship between the address and the "stack" implied by that address. For example, the address may be taken as the low memory address of a buffer intended for use as a stack, or it may be taken as the address to be used as the initial stack pointer register value for the new thread. These two are not the same except for a machine on which the stack grows "up" from low memory to high, and on which a "push" operation first stores the value in memory and then increments the stack pointer register. Further, on a machine where the stack grows "down" from high memory to low, interpretation of the address as the "low memory" address requires a determination of the intended size of the stack. IEEE Std 1003.1-2001 has introduced the new interfaces <A HREF="pthread_attr_setstack.html"><B>pthread_attr_setstack</B>(3)</A> and <A HREF="pthread_attr_getstack.html"><B>pthread_attr_getstack</B>(3)</A> to resolve these ambiguities. </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_attr_init.html"><B>pthread_attr_destroy</B>(3)</A> , <A HREF="pthread_attr_init.html"><B>pthread_attr_getdetachstate</B>(3)</A> , <A HREF="pthread_attr_getstack.html"><B>pthread_attr_getstack</B>(3)</A> , <A HREF="pthread_attr_getstacksize.html"><B>pthread_attr_getstacksize</B>(3)</A> , <A HREF="pthread_attr_setstack.html"><B>pthread_attr_setstack</B>(3)</A> , <A HREF="pthread_create.html"><B>pthread_create</B>(3)</A> , the Base Definitions volume of IEEE Std 1003.1-2001, <I><limits.h></I>, <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>