[jbossts-issues] [JBoss JIRA] Created: (JBTM-599) Synchronization problem in CacheStore

[Andrew Dinn (JIRA)]

Synchronization problem in CacheStore
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                 Key: JBTM-599
                 URL: https://jira.jboss.org/jira/browse/JBTM-599
             Project: JBoss Transaction Manager
          Issue Type: Bug
      Security Level: Public (Everyone can see)
            Reporter: Andrew Dinn


This bug manifests occasionally when running the CachedTest. The AsyncStore thread suspends inside its run method on a (120 sec) timed wait because the cache is not full. When I managed to catch this case in the debugger I found that there were many writer threads (~30) suspended inside addWork in an untimed wait on the overflow lock. So, these writing threads  make  no progress for 120 seconds. The AsyncStore thread does notify the object on which the writers are waiting but there is clearly a window where the writers can go to sleep while the cache is full and not get notified when the AsyncStore thread has emptied it.

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