[racket] disable garbage collection

We'd like to have an incremental collector, and I expect we'll get
there one day, but probably not very soon (unless someone dives in).

At Thu, 02 Jun 2011 11:58:06 -0700, Richard Cleis wrote:
> I have ruled out Racket in applications were I needed to precisely inhibit GC 
> until regular critical slices are completed, then trigger GC ASAP.  The efforts 
> were partially successful, but there's no way to guarantee behavior of faux 
> real-time hacks like that.
> 
> I wonder how difficult it would be to have randomly interruptible GC.  It seems 
> impossible, but I would use it.  The Impossible is often desirable.
> 
> RAC
> 
> On Jun 2, 2011, at 10:01 AM, Eduardo Bellani <ebellani at gmail.com> wrote:
> 
> >> * Extremely Unusual Situations: if you're in the unusual situation of
> >> doing something normally considered inadvisable, like you're
> >> intentionally designing the SR-71 to leak fuel, maybe there's some
> >> bizarre rocket-scientist reason understood only by you that you have to
> >> turn off GC just to get your app to fly in one piece.  Almost no one
> >> will ever need this, and, in the case of Racket, they could always add
> >> it if they did.