NAME

pthread_attr_getstackaddr − Obtains the stack address attribute of the specified thread attributes object. 

LIBRARY

DECthreads POSIX 1003.1c Library (libpthread.so)

SYNOPSIS

#include <pthread.h>

int pthread_attr_getstackaddr_np(
                const pthread_attr_t  ∗attr,
                void                  ∗∗stackaddr,
                size_t                ∗size);

STANDARDS

Interfaces documented on this reference page conform to industry standards as follows:

IEEE Std 1003.1c-1995, POSIX System Application Program Interface

PARAMETERS

attrAddress of the thread attributes object whose stack address attribute is obtained. 

stackaddrReceives the address of the stack region of the thread attributes object specified by attr. 

sizeThe size of the stack region in bytes. 

DESCRIPTION

This routine obtains the value of the stack address attribute of the thread attributes object specified in the attr argument and stores it in the location specified by the stackaddr argument.  The specified attributes object must already be initialized at the time this routine is called. 

The stack address attribute of a thread attributes object points to the origin of the stack for a new thread. 

Unlike pthread_attr_getstackaddr(3), this routine is a much more reliable portable interface.  With the POSIX standard pthread_attr_getstackaddr(3), a stack is specified using a single, undefined, address.  An implementation of the standard can only assume that the specified value represents the value to which the thread’s stack pointer should be set when beginning execution.  However, this requires the application to know how the machine uses the stack.  For example, a stack may grow either up (to higher addresses) or down (to lower addresses), and may be decreased (or increased) either before or after storing a new value. 

DECthreads provides an alternative interface with pthread_attr_getstackaddr_np(3). Instead of returning a stack address, it returns the base (lowest) address and the size. 

RETURN VALUES

If an error condition occurs, this routine returns an integer value indicating the type of error.  Possible return values are as follows:

0Successful completion. 

[EINVAL]The value specified by attr is not a valid thread attributes object. 

ERRORS

None

RELATED INFORMATION

Functions: pthread_attr_setstackaddr_np(3)
 

Manuals: Guide to DECthreads and Programmer’s Guide