VMS Help POSIX Threads, PTHREAD routines, pthread_attr_setstackaddr_np  *Conan The Librarian (sorry for the slow response - running on an old VAX)

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

1 - C Binding

    #include <pthread.h>

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

2 - Arguments

 attr

    Address of the thread attributes object whose stack address
    attribute is to be modified.

 stackaddr

    New value for the address of the stack region of the thread
    attributes object specified by attr.

 size

    The size of the stack region in bytes.

3 - 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(), this routine is a much more
    reliable portable interface. With the POSIX standard pthread_
    attr_setstackaddr(), 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.

    The Threads Library provides an alternative interface with
    pthread_attr_setstackaddr_np(). Instead of specifying a stack
    address, you specify the base (lowest) address and the size.

4 - Return Values

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

    Return      Description

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

5 - Associated Routines

       pthread_attr_getstackaddr_np()