[racket] Setting exception handler for GUI message loop

Think along this minimal example: 

#lang racket/gui

(define frame (new frame% [label "x"][width 200][height 200]))

(define button 
  (new button%
       [label "hello world"]
       [parent frame]
       [callback
        (lambda (b e)
          (/ 1 0))]))

(queue-callback 
 (lambda ()
   (uncaught-exception-handler 
    (lambda (xn)
      (displayln `(qb ,(exn-message xn)))))))

(send frame show #t)




On Aug 22, 2014, at 11:18 AM, Dmitry Cherkassov <dcherkassov at gmail.com> wrote:

> WIll that install my exception handler only for calls under
> `(parameterize uncaught-exception-hamdler () ... )` or for all the
> stuff in GUI thread?
> 
> On Fri, Aug 22, 2014 at 6:57 PM, Matthew Flatt <mflatt at cs.utah.edu> wrote:
>> If you're not already in the handler thread (which is the same as the
>> initial thread for the initial eventspace), then you can use
>> `queue-callback` to run a thunk in the current eventspace's handler
>> thread.
>> 
>> At Fri, 22 Aug 2014 18:51:26 +0400, Dmitry Cherkassov wrote:
>>>> Another possibility is to set the `uncaught-exception-handler` parameter (in
>>> the eventspace's main thread).
>>> set as dynamic parameter via `parameterize'?
>>> 
>>> how do i get to GUI thread to accomplish that?
>>> 
>>> 
>>> 
>>> On Fri, Aug 22, 2014 at 6:37 PM, Matthew Flatt <mflatt at cs.utah.edu> wrote:
>>>> Another possibility is to set the `uncaught-exception-handler`
>>>> parameter (in the eventspace's main thread).
>>>> 
>>>> At Fri, 22 Aug 2014 10:37:35 -0400, Matthias Felleisen wrote:
>>>>> 
>>>>> Your question is somewhat generic. You will need to equip each callback/event
>>>>> handler with an exn handler that puts the exception into a channel so that
>>>>> another thread can pick it up. -- Matthias
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> On Aug 22, 2014, at 6:58 AM, Dmitry Cherkassov <dcherkassov at gmail.com> wrote:
>>>>> 
>>>>>> Hi!
>>>>>> 
>>>>>> Is it possible to set an exception handler to GUI message loop, so
>>>>>> that any exception thrown in GUI thread can be handled?
>>>>>> 
>>>>>> --
>>>>>> With best regards,
>>>>>> Dmitry
>>>>>> ____________________
>>>>>> Racket Users list:
>>>>>> http://lists.racket-lang.org/users
>>>>> 
>>>>> 
>>>>> ____________________
>>>>>  Racket Users list:
>>>>>  http://lists.racket-lang.org/users
>>> 
>>> 
>>> 
>>> --
>>> With best regards,
>>> Dmitry
> 
> 
> 
> -- 
> With best regards,
> Dmitry