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pthread_default_stacksize_np(3T)	      pthread_default_stacksize_np(3T)

NAME
       pthread_default_stacksize_np() - change the default stacksize

SYNOPSIS
PARAMETERS
	      new_size	The new default stack size.

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

DESCRIPTION
       The function allows an application to change the default value for  the
       stacksize  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 termi‐
       nate.  The next time a thread is created with a default stack  size,  a
       cached  thread  (and its stack) are reused. This can result in signifi‐
       cant performance improvements for

       However, if the default stack size is not appropriate for  an  applica‐
       tion,  it  cannot  take	advantage  of this performance enhancement. By
       using the function, the threads library will change the	default	 stack
       size so that it matches the applications needs.	This allows the appli‐
       cation to utilize the performance benefit of cached threads.

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:

	      [EINVAL]	     The value specified by new_size is less than

	      [EPERM]	     The calling process has already  created  threads
			     (this  must be called before any threads are cre‐
			     ated).

WARNINGS
       If the environment variable is set with a valid value for default stack
       size,  then it takes precedence over the invocation of interface.  How‐
       ever, it returns the current default stack size in old_size.

       The maximum default stack size value that may be set through the	 envi‐
       ronment	variable  is restricted to 10 MB; any value greater than 10 MB
       will be rounded down to 10 MB.

       Care should be taken while setting the default stack size  limit	 since
       this  could impact the maximum number of threads that can be created in
       a process.

AUTHOR
       was developed by HP.

SEE ALSO
       pthread_attr_getstacksize(3T), pthread_attr_setstacksize(3T).

STANDARDS CONFORMANCE
				Pthread Librarpthread_default_stacksize_np(3T)

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