From: leon breedt <bitserf@...>
Date: 2004-12-11T16:11:46+09:00
Subject: Re: Thread.critical and segfaults calling into Ruby callbacks from C

On Sat, 11 Dec 2004 15:45:56 +0900, Eric Hodel <drbrain@segment7.net> wrote:
> You may already be in a critical section here.
> 
> > ....
> > ensure
> > Thread.critical = false
> > end
> 
> def cb
>    old_critical = Thread.critical = true
>    # ...
> ensure
>    Thread.critical = old_critical
> end
> 
> (GC.disable/enable works the same way.)

Thanks for the tip. 

It seems I spoke too quickly though, doing something as simply as add
$stderr.puts before and after the Thread.critical modifications brings
back the same segfault...Doing an 'info threads' in gdb also shows
only the one process.

Back to debugging...