PTHREAD_ATTR_GETSTACKADDR(3P)				     POSIX Programmer's Manual				     PTHREAD_ATTR_GETSTACKADDR(3P)

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME

       pthread_attr_getstackaddr, pthread_attr_setstackaddr - get and set the stackaddr attribute

SYNOPSIS

       #include <pthread.h>

       int pthread_attr_getstackaddr(const pthread_attr_t *restrict attr,
	      void **restrict stackaddr);
       int pthread_attr_setstackaddr(pthread_attr_t *attr, void *stackaddr);

DESCRIPTION

       The pthread_attr_getstackaddr() and pthread_attr_setstackaddr() functions, respectively, shall get and set the  thread  creation  stackaddr
       attribute in the attr object.

       The  stackaddr  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}.

RETURN VALUE

       Upon successful completion, pthread_attr_getstackaddr() and pthread_attr_setstackaddr() shall return a value of 0; otherwise, an error num-
       ber shall be returned to indicate the error.

       The pthread_attr_getstackaddr() function stores the stackaddr attribute value in stackaddr if successful.

ERRORS

       No errors are defined.

       These functions shall not return an error code of [EINTR].

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       The  specification  of  the  stackaddr  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 pthread_attr_setstack() and pthread_attr_getstack() to resolve these ambiguities.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       pthread_attr_destroy(),	pthread_attr_getdetachstate(),	pthread_attr_getstack(),   pthread_attr_getstacksize(),   pthread_attr_setstack(),
       pthread_create(), the Base Definitions volume of IEEE Std 1003.1-2001, <limits.h>, <pthread.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- 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 http://www.opengroup.org/unix/online.html .

IEEE
/The Open Group						       2003					     PTHREAD_ATTR_GETSTACKADDR(3P)