pthread_attr_setstackaddr_np(3) [osf1 man page]

pthread_attr_setstackaddr(3)				     Library Functions Manual				      pthread_attr_setstackaddr(3)

NAME

       pthread_attr_setstackaddr - Changes the stack address and size of the specified thread attributes object.

LIBRARY

       DECthreads POSIX 1003.1c Library (libpthread.so)

SYNOPSIS

       #include <pthread.h>

       int pthread_attr_setstackaddr_np(
		       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 to be modified.  New value for 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 uses the values specified in the stackaddr and size arguments to set the base stack address and size of the thread	attributes
       object specified in the attr argument.

       When creating a thread, use a thread attributes object to specify nondefault values for thread attributes.  The default value for the stack
       address attribute of an initialized thread attributes object is NULL.

       Unlike pthread_attr_setstackaddr(3), this routine is a much more reliable portable interface.  With the	POSIX  standard  pthread_attr_set-
       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_setstackaddr_np(3). Instead of specifying a stack address, you  specify  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_getstackaddr_np(3)

       Manuals: Guide to DECthreads and Programmer's Guide delim off

														      pthread_attr_setstackaddr(3)

pthread_attr_setstackaddr(3)				     Library Functions Manual				      pthread_attr_setstackaddr(3)

NAME

       pthread_attr_setstackaddr - Changes 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_setstackaddr(
			pthread_attr_t	      *attr,
			void		      *stackaddr);

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 to be modified.  New value for the stack address attribute of the
       thread attributes object specified by attr.

DESCRIPTION

       This routine uses the value specified in the stackaddr argument to set the stack address attribute of the thread attributes  object  speci-
       fied in the attr argument.

       When  creating a thread, use a thread attributes object to specify nondefault values for thread attributes.  The stack address attribute of
       a thread attributes object points to the origin of the stack for a new thread.

       The default value for the stack address attribute of an initialized thread attributes object is NULL.

       For your program to calculate a value for the stackaddr attribute, note that: Your program must allocate the memory that will be  used  for
       the new thread's stack.	On Tru64 UNIX, to create a new thread using a thread attributes object, the stackaddr attribute must be an address
       that points to the high-memory end of the memory region allocated for the stack. This address must point to the highest even-boundary quad-
       word  in  the  allocated  memory  region.   Also  note that: If you use the pthread_attr_setstackaddr(3) routine to set a thread attributes
       object's stack address attribute and use that attributes object to create a new thread, DECthreads ignores the attributes  object's  guard-
       size  attribute	and  provides  no thread stack guard area for the new thread.  If you use the same thread attributes object to create more
       than one thread and each created thread uses a nondefault stack address, you must use the pthread_attr_setstackaddr(3)  routine	to  set  a
       unique stack address attribute value for each new thread created using that attributes object.

NOTES

       Correct	use of this routine depends upon details of the target platform's stack architecture.  Thus, this routine cannot be used in a por-
       table manner.

       The size of the stack must be at least PTHREAD_STACK_MIN bytes (see pthread.h).	However, because DECthreads must use  a  portion  of  this
       stack  memory  to  begin  thread  execution and to maintain thread state, your program's "user thread code" cannot rely on using all of the
       stack memory allocated.

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.

ERRORS

       None

RELATED INFORMATION

       Functions:      pthread_attr_getguardsize(3),	 pthread_attr_getstackaddr(3),	   pthread_attr_getstacksize(3),     pthread_attr_init(3),
       pthread_attr_setguardsize(3), pthread_attr_setstacksize(3), pthread_create(3)

       Manuals: Guide to DECthreads and Programmer's Guide delim off

														      pthread_attr_setstackaddr(3)