[jira] Resolved: (HARMONY-4624) [classlib][swing]SplitPane triggers the deadlock in AbstractDocument$ReadWriteLock

["Alexey Petrenko (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HARMONY-4624?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alexey Petrenko resolved HARMONY-4624.
--------------------------------------

    Resolution: Fixed

Yes, I agree that this patch is more likely a workaround, but it resolves the issue at the moment without any detected regressions.
So I've committed the patch and created HARMONY-4634 to track the better patch creation.


> [classlib][swing]SplitPane triggers the deadlock in AbstractDocument$ReadWriteLock
> ----------------------------------------------------------------------------------
>
>                 Key: HARMONY-4624
>                 URL: https://issues.apache.org/jira/browse/HARMONY-4624
>             Project: Harmony
>          Issue Type: Bug
>          Components: Classlib
>         Environment: win32
>            Reporter: Chunrong Lai
>            Assignee: Alexey Petrenko
>         Attachments: h4624.workaround.patch
>
>
>  Dead lock possibilities are seen in the synchronized metnods of AbstractDocument$ReadWriteLock. 
>         public final synchronized void readLock() {
>             final Thread thread = Thread.currentThread();
>             if (writer != thread) {
>                 while (writerCount > 0) {
>                     try { wait(); } 
>                     catch (final InterruptedException e) { }
>                 }
>             }
>             readers.add(thread);
>         }
>  Waiting in synchronized methods (requires another synchronized method to wakeup it) likely just  dies there.
>  Multithreaded SplitPane application triggers the possibility. One thread can operate at the texts of the LeftComponent, thus in a critical section after setting writercount(writeLock()). The other thread can operate at the rightComponent, then call the readLock() of LeftComponent via layout managment and just waits there. 
>  Attach patch eliminates the said intra-splitpane-lock-acquirement. But it is more likely a workaround.
>  

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