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https://issues.apache.org/activemq/browse/AMQCPP-277?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=57040#action_57040
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Timothy Bish commented on AMQCPP-277:
-------------------------------------
You can try stopping the Session before creating the consumer and then starting
it again.
I've tried several different machines and test cases to reproduces this but
can't seem to recreate such a freeze. I'd recommend capturing a backtrace of
all the threads that are running at the time of the freeze since you seem to be
able to reproduce the bug.
> Freeze when creating multiple Consumers
> ---------------------------------------
>
> Key: AMQCPP-277
> URL: https://issues.apache.org/activemq/browse/AMQCPP-277
> Project: ActiveMQ C++ Client
> Issue Type: Bug
> Affects Versions: 3.1
> Environment: Windows 7 x64, ActiveMQ Server 5.3, Java 6.0.17, Visual
> Studio 2008 SP1, Windows 7 SDK, APR 1.3.9
> Reporter: Eddie Fast
> Assignee: Timothy Bish
> Fix For: 3.2.0
>
>
> We create multiple MessageConsumers with different selectors. This can be
> upwards of 50 or so consumers per client.
> We recently upgraded to 3.1 from 2.2.2. We also upgraded our ActiveMQ
> Server to 5.3 from 5.2.
> After upgrading, we've been seeing random, but frequent freezing in our
> clients. I've narrowed it down to where it creates the MessageConsumer and
> calls setMessageListener();
> It seems to be stuck, waiting for a thread to join.
> I've modified the main.cpp to exhibit this behavior, but I've only been able
> to reproduce it randomly. It seems to happen more frequently if you stick a
> breakpoint on this line in Thread.cpp, Thread::join():
> Thread::join( INFINITE, 0 );
> Here's the callstack where it freezes, which is consistent in our clients as
> well as the main.cpp example:
> ntdll.dll!76fff871()
> [Frames below may be incorrect and/or missing, no symbols loaded for
> ntdll.dll]
> ntdll.dll!76fff871()
> KernelBase.dll!75e20816()
> kernel32.dll!755b1138()
>
> activemq-cppd.dll!decaf::internal::util::concurrent::ConditionImpl::wait(decaf::util::concurrent::ConditionHandle
> * condition=0x0239e0e0, __int64 mills=4294967295, __int64 nanos=0) Line 110
> + 0x10 bytes C++
> activemq-cppd.dll!decaf::util::concurrent::Mutex::wait(__int64
> millisecs=4294967295, int nanos=0) Line 124 + 0x20 bytes C++
> activemq-cppd.dll!decaf::lang::Thread::join(__int64
> millisecs=4294967295, unsigned int nanos=0) Line 464 + 0x36 bytes C++
> activemq-cppd.dll!decaf::lang::Thread::join() Line 421 C++
> > activemq-cppd.dll!activemq::threads::DedicatedTaskRunner::shutdown()
> > Line 83 C++
> activemq-cppd.dll!activemq::core::ActiveMQSessionExecutor::stop() Line
> 110 C++
> activemq-cppd.dll!activemq::core::ActiveMQSession::stop() Line 807
> C++
>
> activemq-cppd.dll!activemq::core::ActiveMQConsumer::setMessageListener(cms::MessageListener
> * listener=0x0018fe0c) Line 523 C++
> vs2005-activemq-example.exe!HelloWorldConsumer::run() Line 247 + 0x5b
> bytes C++
>
> activemq-cppd.dll!decaf::lang::ThreadProperties::runCallback(decaf::lang::ThreadProperties
> * properties=0x01df7f68) Line 133 + 0x11 bytes C++
> activemq-cppd.dll!`anonymous namespace'::threadWorker(void *
> arg=0x01df7f68) Line 204 + 0x9 bytes C++
> msvcr90d.dll!_callthreadstartex() Line 348 + 0xf bytes C
> msvcr90d.dll!_threadstartex(void * ptd=0x01dfafd8) Line 331 C
> To modify main.cpp, it's pretty simple. Instead of creating 1
> MessageConsumer in HelloWorldConsumer::run(), I've created 50:
> {quote}
> // put this line with the class variables
> std::vector<MessageConsumer*> consumers;
> for ( int i = 0; i < 50; i++ )
> {{
> // Create a MessageConsumer from the Session to the Topic or Queue
> consumers.push_back( session->createConsumer( destination ) );
> consumers.back()->setMessageListener( this );
> }}
> {quote}
> I'm using the standard .conf for the server. I've reverted to 2.2.2 and
> have no issues.
> Any ideas?
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