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From "Eugene S. Ostrovsky (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HARMONY-3381) [drlvm][shutdown] unsafe termination of daemon threads
Date Tue, 13 Mar 2007 13:01:48 GMT

     [ https://issues.apache.org/jira/browse/HARMONY-3381?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Eugene S. Ostrovsky updated HARMONY-3381:
-----------------------------------------

    Attachment: changing-shutdown-to-exit-threads-instead-of-throwing-exception.patch

Added patch:
  changing-shutdown-to-exit-threads-instead-of-throwing-exception.patch

Implements new daemon threads termination approach:
1. running threads exit in safe points
2. blocked threads are cancelled

> [drlvm][shutdown] unsafe termination of daemon threads
> ------------------------------------------------------
>
>                 Key: HARMONY-3381
>                 URL: https://issues.apache.org/jira/browse/HARMONY-3381
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>            Reporter: Eugene S. Ostrovsky
>         Attachments: changing-shutdown-to-exit-threads-instead-of-throwing-exception.patch
>
>
> vm_shutdown_stop_java_threads() function tries to terminate daemon threads by setting
TheadDeath exception to them and interrupting in infinite loop.
> 1. There's a race condition in this algorithm: No one can guarantee that continuous setting
TheadDeath exception to a thread will force it to terminate.
> 2. TheadDeath is throwing in the points that may not be safe for exception throwing.
This may lead to vm crash (or assertion). 
> ( Such crash was reproduced on win/ia32 on gc.Mark smoke test with the patch from HARMONY-3297)

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