[armedbear-devel] EXTENSIONS:EXIT behavior (was Re: [armedbear-ticket] [armedbear] #164: Cannot quit SLIME REPL)

[Alessio Stalla]

On Mon, Aug 22, 2011 at 2:28 PM, Ville Voutilainen
<ville.voutilainen at gmail.com> wrote:
> On 22 August 2011 15:26, Mark Evenson <evenson at panix.com> wrote:
>> Next question:  then why is the ProcessingTerminated exception only
>> thrown in the EXT:EXIT and EXT:QUIT implementations?  When would
>> we ever expect it to be thrown?
>
> I thought it's thrown from the interpreter when cmdline option parsing fails,
> and possibly in a couple of other places. There should be a clear difference
> between exit/quit (which are called) and error cases (which throw).

IIRC, EXT:EXIT/QUIT used to call System.exit but were reengineered to
throw ProcessingTerminated to be more application-server friendly, and
in general for cases when ABCL is used as a library as you pointed
out. I'm not too satisfied either with the current solution, because
the use of ABCL as an application rather than a library becomes more
complicated, especially with multiple threads. Perhaps when
constructing the interpreter one could pass a callback to use for
EXIT/QUIT, defaulting to throw ProcessingTerminated in general, and to
System.exit when the interpreter is created from
org.armedbear.lisp.Main.

Bye,
Alessio