Different methods synchronizing on different mutexes when changing the same
field
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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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