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Second app instance does not exit #1066

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#1072
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Second app instance does not exit#1066
#1072
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AhmedMagedC
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bugSomething isn't workinggood first issueGood for newcomershelp wantedExtra attention is neededpdeProcessing Development Environment
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4.4.5
@Junology

Description

@Junology
Junology
opened on Apr 29, 2025
Contributor

Most appropriate sub-area of Processing 4?

PDE

Processing version

4.4.3 (portable)

Operating system

Linux (Ubuntu 20.04 x64)

Steps to reproduce this

"1. Download processing-4.4.3-linux-x64-portable.zip, extract it, and cd Processing/bin

  1. ./Processing & and wait for Processing to launch.

  2. ./Processing & again and wait for the second Processing IDE to launch.

  3. Close both Processing windows.

  4. ps | grep Processing and you'll see the second Processing process is still alive."

snippet


    
      
      
    
  


Additional context


I also observed the same happens for local build with Gradle.

The problem is not critical since Ctrl-C terminates it anyway, but it is a bit bothering when it happens.


Would you like to work on the issue?


No; I am not familier with Kotlin, sorry.
Activity
Junology
added 
bugSomething isn't working
 on Apr 29, 2025
Stefterv
added 
help wantedExtra attention is needed
 
good first issueGood for newcomers
 
pdeProcessing Development Environment
 on Apr 29, 2025
Stefterv
Stefterv commented on Apr 29, 2025 
@Stefterv
Stefterv
on Apr 29, 2025
Collaborator
Good point, I've also seen this happen on macOS. As for a bit of background: 

  

    

      processing4/app/src/processing/app/SingleInstance.java
    

    

        Lines 52 to 54
      in
      c83f44c
    

  

  

    


        

          
           static boolean alreadyRunning(String[] args) { 
        


        

          
             return Preferences.get(SERVER_PORT) != null && sendArguments(args); 
        


        

          
           } 
        

    

  



 I suspect something in the send arguments code might not be finishing, keeping the second instance of Processing alive.
Junology
Junology commented on Apr 30, 2025 
@Junology
Junology
on Apr 30, 2025
ContributorAuthor
Glancing at the source, I noticed that existing instance check, i.e., SingleInstance.alreadyRunning is performed in processing.app.Base. IMO, the method should be called from the genuine startup code processing.app.ui.Start.main, right? Otherwise, we have to see the splash screen in each time we open a sketch from file managers, as it is now.
AhmedMagedC
AhmedMagedC commented on May 3, 2025 
@AhmedMagedC
AhmedMagedC
on May 3, 2025
I can also reproduce this bug on windows

I have also observed that when you open multiple instances like three processes and you try to close any of them, they all remain exist, until you close every one of them then only one of the processes exits and the rest remains


i would love to work on this issue
SableRaf
assigned 
AhmedMagedC
on May 3, 2025
AhmedMagedC
linked a pull request that will close this issue on May 4, 2025
Stefterv
added this to the  4.4.5 milestone on May 12, 2025
SableRaf
added this to  Processing Roadmapon May 16, 2025
Stefterv
moved this to In progress in  Processing Roadmapon Jun 23, 2025
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      Second app instance does not exit · Issue #1066 · processing/processing4