pthread_default_rsestacksize_np(3T)									       pthread_default_rsestacksize_np(3T)

NAME

       pthread_default_rsestacksize_np() - change the default stacksize.

SYNOPSIS

PARAMETERS

       new_size  The new default register stack size.

       old_size  Pointer to where the old default register stack size is returned.

DESCRIPTION

       The  function  allows  an  application to change the default value for the rsestacksize attribute.  This function must be called before any
       threads have been created.  The new default stack size is passed in the new_size parameter.  If not NULL, the previous default  stack  size
       is returned in old_size.  If new_size is zero, this function can be used (at any time) to query the current default stack size.

       On HP-UX, threads with default stack sizes are cached after they terminate.  The next time a thread is created with a default stack size, a
       cached thread (and its stack) are reused.  This can result in significant performance improvements for

       However, if the default register stack size is not appropriate for an application, it cannot take advantage of  this  performance  enhance-
       ment.   By  using  the  function,  the  threads library will change the default stack size so that it matches the applications needs.  This
       allows the application to utilize the performance benefit of cached threads.  If either of the set register stack size APIs is  called  the
       register  stack	portion  of the stack space will be that large instead of size determined by the implementation.  The memory stack portion
       will be the remainder.

RETURN VALUE

       Upon successful completion, returns zero. Otherwise, an error number is returned to indicate the error (the variable is not set).

ERRORS

       If any of the following occur, the function returns the corresponding error number:

	      The value specified by
			     new_size is less than register stack required for a thread.

	      The calling process has already created threads (this must be called
			     before any threads are created).

AUTHOR

       was developed by HP.

SEE ALSO

       pthread_attr_getstacksize(3T), pthread_attr_setstacksize(3T), pthread_default_stacksize_np(3T).

STANDARDS CONFORMANCE

								  Pthread Library			       pthread_default_rsestacksize_np(3T)