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pthread_attr_getstackaddr(3)


NAME

  pthread_attr_getstackaddr - Obtains the stack address attribute of the
  specified thread attributes object


SYNOPSIS

  #include <pthread.h>

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


LIBRARY

  DECthreads POSIX 1003.1c Library (libpthread.so)


STANDARDS

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

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


PARAMETERS

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

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

  size
      The 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:

  0   Successful completion.

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


ERRORS

  None


SEE ALSO

  Functions: pthread_attr_setstackaddr_np(3)

  Manuals: Guide to DECthreads and Programmer's Guide

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