Re: How to debug hang?

[David Abrahams <dave@boost-consulting.com>]

Perry Smith <pedz@easesoftware.com> writes:

> On Nov 17, 2006, at 8:50 PM, David Abrahams wrote:
>
>     Hi,
>    
>     I'm trying to debug some kind of a hang that occurs when I try to use
>     a font-lock mode I'm developing.  I can't get control back by hitting
>     `C-g'.  I suspected it was a bad (combinatoric) regexp, but I added
>     advice before and after re-search-forward that emitted enter/exit
>     messages, and when the hang occurs I am seeing an exit message, so I'm
>     guessing that's not it.  I'm quite stumped now; hoping someone can
>     offer a clue.
>
> Check out debug-on-quit.  If that doesn't work, try debug-on-signal
> and then kill the emacs from a separate window.  I'm not sure what
> that will do to your context.

Thanks.  Good-ol'-GDB turned out to be the ticket, and it shows me to
be doing regexp matching during the "hang;" oh joy.  Gotta love those
ambiguous grammars!

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com