Re: Occasional NSInternalInconsistencyException

[Gregory Casamento]

The proper way to do this would be to bring up the panel in the
applicationDidFinishLaunching: method in the NSApplication delegate.  This
way the runloop is running and processing events.  I can't pinpoint in my
mind the exact line of code, but I am reasonably certain that this should
avoid your problem.

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11/19/19,
05:24:31 PM

On Tue, Nov 19, 2019 at 1:07 PM Ivan Vučica  wrote:

> Would the bug here, then, be that alerts don't check for this edge case?
>
> Patryk: I'd merge a pull request that makes -[NSAlert runModal] check
> for an active runloop.
>
> On Tue, Nov 19, 2019 at 5:49 PM Gregory Casamento
>  wrote:
> >
> > Running modal panels requires the application run loop to be active.
> You're not doing that.   I suggest you take a look at some of the
> application examples for how to do what you want here.
> >
> > On Tue, Nov 19, 2019, 10:34 AM Patryk Laurent  wrote:
> >>
> >>
> >> > On Nov 18, 2019, at 09:16, Wolfgang Lux 
> wrote:
> >> >
> >> >> Am 18.11.2019 um 04:43 schrieb Patryk Laurent :
> >> >> “Uncaught exception NSInternalInconsistencyException, reason:
> registration with registered client.”
> >> >
> >> > The error message itself is coming from
> NSDistributedNotificationCenter and it looks like it's caused by a race
> condition when two threads in your program are adding an observer to the
> distribution notification center at about the same time.
> >>
> >> Thanks, Wolfgang. I find this surprising because my program is minimal
> (source code below). I wasn’t getting this before, will look for what has
> changed...
> >>
> >> Patryk
> >>
> >> #import 
> >>
> >> int main()
> >> {
> >>   NSApplication *app;
> >>   app = [NSApplication sharedApplication];
> >>
> >>   NSAlert * alert = [[NSAlert alloc] init];
> >>   [alert setMessageText:@"Hello alert"];
> >>   [alert addButtonWithTitle:@"All done"];
> >>   int result = [alert runModal];
> >>   if (result == NSAlertFirstButtonReturn) {
> >> NSLog(@"First button pressed");
> >>   }
> >> }
> >>
> >>
> >>
> >>
> >>
> >>
>


-- 
Gregory Casamento
GNUstep Lead Developer / OLC, Principal Consultant
http://www.gnustep.org - http://heronsperch.blogspot.com
http://ind.ie/phoenix/

Re: Occasional NSInternalInconsistencyException

[Ivan Vučica]

Would the bug here, then, be that alerts don't check for this edge case?

Patryk: I'd merge a pull request that makes -[NSAlert runModal] check
for an active runloop.

On Tue, Nov 19, 2019 at 5:49 PM Gregory Casamento
 wrote:
>
> Running modal panels requires the application run loop to be active.
> You're not doing that.   I suggest you take a look at some of the application 
> examples for how to do what you want here.
>
> On Tue, Nov 19, 2019, 10:34 AM Patryk Laurent  wrote:
>>
>>
>> > On Nov 18, 2019, at 09:16, Wolfgang Lux  wrote:
>> >
>> >> Am 18.11.2019 um 04:43 schrieb Patryk Laurent :
>> >> “Uncaught exception NSInternalInconsistencyException, reason: 
>> >> registration with registered client.”
>> >
>> > The error message itself is coming from NSDistributedNotificationCenter 
>> > and it looks like it's caused by a race condition when two threads in your 
>> > program are adding an observer to the distribution notification center at 
>> > about the same time.
>>
>> Thanks, Wolfgang. I find this surprising because my program is minimal 
>> (source code below). I wasn’t getting this before, will look for what has 
>> changed...
>>
>> Patryk
>>
>> #import 
>>
>> int main()
>> {
>>   NSApplication *app;
>>   app = [NSApplication sharedApplication];
>>
>>   NSAlert * alert = [[NSAlert alloc] init];
>>   [alert setMessageText:@"Hello alert"];
>>   [alert addButtonWithTitle:@"All done"];
>>   int result = [alert runModal];
>>   if (result == NSAlertFirstButtonReturn) {
>> NSLog(@"First button pressed");
>>   }
>> }
>>
>>
>>
>>
>>
>>

Re: Occasional NSInternalInconsistencyException

[Patryk Laurent]

> On Nov 18, 2019, at 09:16, Wolfgang Lux  wrote:
> 
>> Am 18.11.2019 um 04:43 schrieb Patryk Laurent :
>> “Uncaught exception NSInternalInconsistencyException, reason: registration 
>> with registered client.”
> 
> The error message itself is coming from NSDistributedNotificationCenter and 
> it looks like it's caused by a race condition when two threads in your 
> program are adding an observer to the distribution notification center at 
> about the same time.

Thanks, Wolfgang. I find this surprising because my program is minimal (source 
code below). I wasn’t getting this before, will look for what has changed...

Patryk 

#import 

int main()
{
  NSApplication *app;
  app = [NSApplication sharedApplication];

  NSAlert * alert = [[NSAlert alloc] init];
  [alert setMessageText:@"Hello alert"];
  [alert addButtonWithTitle:@"All done"];
  int result = [alert runModal];
  if (result == NSAlertFirstButtonReturn) {
NSLog(@"First button pressed");
  }
}