[Cuis-dev] Freezing UI - can't interrupt via Alt+.

[Juan Vuletich]

On 7/1/2022 9:45 AM, Juan Vuletich via Cuis-dev wrote:
> On 7/1/2022 8:17 AM, Jaromir Matas via Cuis-dev wrote:
>>
>> Hi Juan, all,
>>
>> I wonder why this can’t be interrupted by Alt+.
>>
>> Semaphore new wait
>>
>> The system returns a message “Can not interrupt background process” 
>> and the image has to be closed.
>>
>> The same happens in this case:
>>
>> s := Semaphore new.
>>
>> [1/0. s signal] fork.
>>
>> s wait
>>
>> It not only freezes the UI but is not even recoverable…
>>
>> Thanks,
>>
>> jaromir
>>
>> --
>>
>> *Jaromír Matas*
>>
>> mail at jaromir.net
>>
>
> Hi Jaromir,
>
> The problem is in #handleUserInterrupt, in particular in 
> #processTakingMostCPU. #handleUserInterrupt runs on a high priority 
> process, so the first thing it needs to figure out is which process to 
> interrupt. I wrote that code believing that alt+. would need to 
> interrupt busy code, and it works in that case. It doesn't work if the 
> UI process is waiting and never resumed, as it is not "busy".
>
> We need to do better here. I won't be able to work on this for the 
> next few days, but would be very happy if any of you folks suggest / 
> code a solution.
>
> Thanks,
> -- 
> Juan Vuletich
> www.cuis-smalltalk.org
> https://github.com/Cuis-Smalltalk/Cuis-Smalltalk-Dev
> https://github.com/jvuletich
> https://www.linkedin.com/in/juan-vuletich-75611b3
> https://independent.academia.edu/JuanVuletich
> https://www.researchgate.net/profile/Juan-Vuletich
> https://patents.justia.com/inventor/juan-manuel-vuletich
> https://twitter.com/JuanVuletich

Just pushed a fix. Please review it. It is update #5346.

Thanks!

-- 
Juan Vuletich
www.cuis-smalltalk.org
https://github.com/Cuis-Smalltalk/Cuis-Smalltalk-Dev
https://github.com/jvuletich
https://www.linkedin.com/in/juan-vuletich-75611b3
https://independent.academia.edu/JuanVuletich
https://www.researchgate.net/profile/Juan-Vuletich
https://patents.justia.com/inventor/juan-manuel-vuletich
https://twitter.com/JuanVuletich

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