You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@activemq.apache.org by "Timothy Bish (Commented) (JIRA)" <ji...@apache.org> on 2012/02/22 14:59:50 UTC
[jira] [Commented] (AMQ-3732) Different methods synchronizing on
different mutexes when changing the same field
[ https://issues.apache.org/jira/browse/AMQ-3732?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13213625#comment-13213625 ]
Timothy Bish commented on AMQ-3732:
-----------------------------------
Do you have a junit test case that shows the issue here.
> 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
> Labels: concurrency
>
> 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).
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira