pthread_attr_getstackaddr_np(3) [osf1 man page]

pthread_attr_getstackaddr(3)				     Library Functions Manual				      pthread_attr_getstackaddr(3)

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

       Address	of the thread attributes object whose stack address attribute is obtained.  Receives the address of the stack region of the thread
       attributes object specified by attr.  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_get-
       stackaddr(3),  a  stack is specified using a single, undefined, address.  An implementation of the standard can only assume that the speci-
       fied 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:
       Successful completion.  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 delim off

														      pthread_attr_getstackaddr(3)

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pthread_attr_setstacksize(3)				     Library Functions Manual				      pthread_attr_setstacksize(3)

NAME

       pthread_attr_setstacksize - Changes the stacksize attribute in the specified thread attributes object.

LIBRARY

       DECthreads POSIX 1003.1c Library (libpthread.so)

SYNOPSIS

       #include <pthread.h>

       int pthread_attr_setstacksize(
		       pthread_attr_t  *attr,
		       size_t	       stacksize);

STANDARDS

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

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

PARAMETERS

       Thread attributes object to be modified.  New value for the stacksize attribute of the thread attributes object specified by the attr argu-
       ment.  The stacksize argument must be greater than or equal to PTHREAD_STACK_MIN.  PTHREAD_STACK_MIN specifies the minimum size (in  bytes)
       of stack needed for a thread.

DESCRIPTION

       This  routine  sets the stacksize attribute in the thread attributes object specified by the attr argument.  Use this routine to adjust the
       size of the writable area of the stack for a new thread.

       The size of a thread's stack is fixed at the time of thread creation. Only the initial thread can dynamically extend its stack.

       Many compilers do not check for stack overflow.	Ensure that the new thread's stack is sufficient for the resources  required  by  routines
       that are called from the thread.

RETURN VALUES

       If  an  error condition occurs, this routine returns an integer value indicating the type of error.  Possible return values are as follows:
       Successful completion.  The value specified by attr is invalid, or the value specified by  stacksize  is  less  than  PTHREAD_STACK_MIN	or
       exceeds a DECthreads-imposed limit.

ERRORS

       None

RELATED INFORMATION

       Functions: pthread_attr_init(3), pthread_attr_getstacksize(3), pthread_create(3)

       Manuals: Guide to DECthreads and Programmer's Guide

       delim off

														      pthread_attr_setstacksize(3)

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pthread_attr_getstackaddr_np(3) [osf1 man page]

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