[PATCH] Dynamic thread stack size

[Joe Marcus Clarke]

In a follow-up to the previous discussion on increasing our default
thread stacksize, I thought I'd look at how some other BSD
implementations do it.  Mezz mentioned that he thought NetBSD had a 2 MB
default stacksize, so I took a look.

What I found was that NetBSD doesn't have a static default stacksize.
Instead, they use the stacksize rlimit and a PTHREAD_STACKSIZE
environment variable to get both the initial stacksize as well as each
thread's default stacksize.  I thought this would be a really good way
of doing things, so I ported their work to FreeBSD.

Here is a patch against 5-STABLE's libpthread (also applies to HEAD)
that adds a dynamic thread stacksize.  This can be disabled at compile
time by uncommenting the -DTHR_FIXEDSTACKSIZE CFLAG in the Makefile.
Initial testing shows this does the trick with applications such as
gstreamer and Evolution that require a larger initial thread stacksize
and per-thread default stacksize respectively.  What do you think?

http://www.marcuscom.com/downloads/libpthread.diff

Joe

-- 
Joe Marcus Clarke
FreeBSD GNOME Team      ::      gnome at FreeBSD.org
FreeNode / #freebsd-gnome
http://www.FreeBSD.org/gnome
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