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From "Timothy Bish (JIRA)" <j...@apache.org>
Subject [jira] Commented: (AMQCPP-122) Crash on Windows when rapidly creating and destroying connections
Date Wed, 13 Jun 2007 22:44:33 GMT

    [ https://issues.apache.org/activemq/browse/AMQCPP-122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_39381
] 

Timothy Bish commented on AMQCPP-122:
-------------------------------------

I've submitted a fix that correct issues in the SocketInputStream read and SocketOutputStream
write methods that was stopping them from throwing an IOException when they were closed and
a read or write was in progress.  I've run the code on my windows box with a loop of 5000
in the Stomp Stress Test and gotten an error telling me I've used up all the sockets, similar
to what happens on Linux, this is expected as we are allocating resources so rapidly that
the OS can't keep up.  Give it a try and let me know if you still have problems.



> Crash on Windows when rapidly creating and destroying connections
> -----------------------------------------------------------------
>
>                 Key: AMQCPP-122
>                 URL: https://issues.apache.org/activemq/browse/AMQCPP-122
>             Project: ActiveMQ C++ Client
>          Issue Type: Bug
>    Affects Versions: 2.1
>            Reporter: Albert Strasheim
>            Assignee: Timothy Bish
>             Fix For: 2.1
>
>         Attachments: IOTransportConcurrentv1.patch
>
>
> Me again. :)
> The following program crashes within a few seconds on my Windows XP machine. This machine
has a Core 2 Duo processor (i. e. 2 cores).
> On my Pentium 4 + Hyperthreading Linux machine is only dies after about a minute with:
> terminate called after throwing an instance of 'activemq::exceptions::ActiveMQException'
>   what():  Cannot assign requested address
> Aborted
> However, this is to be expected, since the program causes thousands of sockets to be
created. This doesn't seem to be the reason it crashes on Windows though.
> The code:
> {code:none}
> #include <activemq/core/ActiveMQConnectionFactory.h> 
> #include <cms/Connection.h> 
> #include <cms/Session.h>
> #include <cms/MessageProducer.h>
> #include <cms/DeliveryMode.h>
> int main(int argc, char* argv[]) {                            
>   activemq::core::ActiveMQConnectionFactory connectionFactory("tcp://localhost:61613?wireFormat=stomp");
>   while(true)
>   {
>     cms::Connection* connection = connectionFactory.createConnection(); 
>     cms::Session* session = connection->createSession(cms::Session::AUTO_ACKNOWLEDGE);
>     cms::Topic* topic = session->createTopic("topic");
>     cms::MessageProducer* producer = session->createProducer(topic);
>     delete producer;
>     delete topic;
>     delete session; 
>     delete connection;
>   }
>   return 0;
> }
> {code}
> The stack trace when it crashes:
> >	activemq-cppd.dll!activemq::io::BufferedInputStream::read()  Line 79 + 0x12 bytes
C++
>  	activemq-cppd.dll!activemq::connector::stomp::StompCommandReader::readStompHeaderLine()
 Line 194 + 0x19 bytes	C++
>  	activemq-cppd.dll!activemq::connector::stomp::StompCommandReader::readStompCommandHeader(activemq::connector::stomp::StompFrame
& frame={...})  Line 101	C++
>  	activemq-cppd.dll!activemq::connector::stomp::StompCommandReader::readCommand()  Line
59	C++
>  	activemq-cppd.dll!activemq::transport::IOTransport::run()  Line 166 + 0x19 bytes	C++
>  	activemq-cppd.dll!activemq::concurrent::Thread::runCallback(void * param=0x003ad328)
 Line 152 + 0x13 bytes	C++
>  	msvcr80d.dll!_callthreadstartex()  Line 348 + 0xf bytes	C
>  	msvcr80d.dll!_threadstartex(void * ptd=0x003adac0)  Line 331	C
>  	kernel32.dll!7c80b683() 	
>  	[Frames below may be incorrect and/or missing, no symbols loaded for kernel32.dll]

> The line in BufferedInputStream::read is:
> char returnValue = buffer[head++];
> There is a local variable called bufferSize with a value of 1024. However, the value
of head is usually much larger than bufferSize (like more than 10000).

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