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Salikh Zakirov commented on HARMONY-3272:
-----------------------------------------
HARMONY-3381 probably fixes this test case on Windows.
On Linux, since pthread_mutex_lock is not a cancellation point, the test would probably still
hang.
> [drlvm][thread] DRLVM hangs on stopping deadlocked daemon threads
> -----------------------------------------------------------------
>
> Key: HARMONY-3272
> URL: https://issues.apache.org/jira/browse/HARMONY-3272
> Project: Harmony
> Issue Type: Bug
> Components: DRLVM
> Reporter: Salikh Zakirov
> Assigned To: weldon washburn
> Priority: Minor
> Attachments: NoShutdown.java
>
>
> In order to be able safely release resources on VM shutdown, DRLVM tries to stop all
remaining running daemon threads.
> The stopping algorithm cannot terminate deadlocked threads, i.e. threads blocked on MONITORENTER
instruction,
> if monitors are fat (i.e. MONITORENTER eventually translates to EnterCriticalSection
on Windows, or pthread_mutex_lock on Linux).
> The attached test NoShutdown.java demonstrates the behaviour.
> The possible solution is to use OS-level suspension / signals to suspend daemon threads,
without necessarily terminating them,
> because the original purpose is to prevent them from running simultaneously with VM shutdown
sequence.
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