Swank server dies with any error in REPL

[bruce li]

Thanks for the reply. But I don't quite understand what it means. I
was doing something similar to
https://chriskohlhepp.wordpress.com/embedding-lisp-in-cplusplus-a-recipe/
. When I hit C-c in the console, I drop into the top-level REPL. I
typed:

> (swank:create-server :port 4005)
;; Swank started at port: 4005.

Then I connect to swank server with SLIME, inside which I put
something wrong there:

CL-USER> asdf
Debugger received error of type: UNBOUND-VARIABLE
The variable ASDF; Evaluation aborted on #<a UNBOUND-VARIABLE>.

After that, swank server stops. And I'm dropped back to top level. I
wonder why this happens.

Thanks,
Bruce

2015-09-01 9:34 GMT-04:00 Daniel Kochmański <daniel at turtleware.eu>:
> Hello,
>
> if you call lisp forms from C code (after cl_boot), then you have no set
> handler, so if your code signals a condition, then it goes uncought. If
> that's a case, you could do something, what toplevel does (setting
> handlers etc), or set si::*break-level* to 1 and call tpl:
>
> (let ((si::*break-level* 1)) (si::tpl))
>
> this should spawn toplevel console and won't exit. If you want to set
> proper handler consult src/lsp/tpl.lsp file in ECL sourcecode.
>
> Regards,
> Daniel
>
> bruce li writes:
>
>> Hi, there,
>> I'm pretty new to ECL. I'm currently considering embedding ECL in a
>> game engine. When I interactively interrupt the program and drop into
>> the repl, I load up swank with quicklisp and create swank server with
>> (swank:create-server :port 4005).  I can connect to it from SLIME. But
>> any error in the statement, either by deliberately typing sth wrong,
>> will cause swank server to close instead of dropping into the
>> debugging environment. I have no idea why this happens. It turns out
>> that if I start swank on a different thread with
>> mp:process-run-function, it goes well. But since the game engine is
>> based on OpenGL, multithreading rendering isn't an option. I wonder if
>> there is any way to get around the swank server and enable its
>> debugger when it encounters error.
>>
>> Thanks,
>> Bruce
>
> --
> Daniel Kochmański | Poznań, Poland
> ;; aka jackdaniel
>
> "Be the change that you wish to see in the world." - Mahatma Gandhi