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From "Phillip Henry (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AMQ-3732) Different methods synchronizing on different mutexes when changing the same field
Date Tue, 21 Feb 2012 23:14:48 GMT
Different methods synchronizing on different mutexes when changing the same field
---------------------------------------------------------------------------------

                 Key: AMQ-3732
                 URL: https://issues.apache.org/jira/browse/AMQ-3732
             Project: ActiveMQ
          Issue Type: Bug
          Components: Broker
    Affects Versions: 5.5.1
         Environment: Darwin phillip.local 9.8.0 Darwin Kernel Version 9.8.0: Wed Jul 15 16:55:01
PDT 2009; root:xnu-1228.15.4~1/RELEASE_I386 i386 i386
            Reporter: Phillip Henry


org.apache.activemq.broker.region.PrefetchSubscription.prefetchExtension is changed while
guarded by a mutex on this (PrefetchSubscription) in PrefetchSubscription.pullMessage(...)
and PrefetchSubscription.dispatchLock in PrefetchSubscription.acknowledge(...). 

This can lead to the corruption of the prefetchExtension variable (eg, prefetchExtension++
in pullMessage() is not an atomic operation so prefetchExtension may change in acknowledge()
mid-way through this operation).

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