setting stacksize in "initial" thread (pthreads, 4.8R)

[Daniel Eischen]

On Mon, 26 May 2003, Andrew MacIntyre wrote:

> On Sun, 25 May 2003, Daniel Eischen wrote:
> 
> > On Sun, 25 May 2003, Andrew MacIntyre wrote:
> >
> > > I have a situation with a Python interpreter built from Python
> > > CVS sources that is hitting the stack limit for the "initial" thread
> > > imposed by libc_r:  PTHREAD_STACK_INITIAL in
> > > /usr/src/lib/libc_r/uthread/pthread_private.h is set to 1MB (0x100000).
> 
> {...}
> 
> > Is this something that is common to all python scripts, or is
> > it just your own script(s) that is(are) getting caught.  It
> > seems 1MB is an awful lot to be on the stack, and perhaps some
> > things are better malloc'd.
> 
> The problem actually occurs with recursive matches in Python's regex
> engine.  Python has a hardcoded regex recursion limit, which has trapped
> ballistic matches before running out of the default stack.  However a
> couple of recent fixes to the regex engine have increased stack
> consumption, and the hard limit has to be lowered.

How do you know it is the main thread stack and not a different
thread stack that is getting exceeded?  By default, threads
other than main get a 64K stack, and this is totally configurable
by the application.

-- 
Dan Eischen