Re: [Cppcms-users] Shutdown issue

[Artyom B. <art...@ya...>]

Try to get the backtrace... It is hard to get what exactly happens there
 
Artyom Beilis
--------------
CppCMS - C++ Web Framework:   http://cppcms.com/
CppDB - C++ SQL Connectivity: http://cppcms.com/sql/cppdb/



>________________________________
> From: Szabolcs Rimanóczy <rim...@go...>
>To: Artyom Beilis <art...@ya...>; cpp...@li... 
>Sent: Thursday, March 14, 2013 7:56 PM
>Subject: Re: [Cppcms-users] Shutdown issue
> 
>
>It's a bit better, now, it doesn't hang in the background but displays an error on exit.
>This is what my application does:
>- does something, 
>- reboots
>- does something
>- exits
>
>
>When I set disable_global_exit_handling to false:
>  - on reboot: 
>    - the last log is Shutting down WebService... (just before shutdown)
>    - no log is output between  m_service->run(); and delete m_service;
>    - a log is output: "segfault at 0 ip 402744c0 sp bfaed3f0 error 4 in libcppcms.so.1.0.2[401f7000+211000]"
>  - on exit: 
>    - log is output between m_service->run(); and delete m_service; 
>    - the application never exits, stays in the background 
>
>
>When I set disable_global_exit_handling to true:
>  - on reboot: 
>    - the last log is Shutting down WebService... (just before shutdown)
>    - no log is output between m_service->run(); and delete m_service;
>    - a log is output: "segfault at 0 ip 402744c0 sp bfbb16c0 error 4 in libcppcms.so.1.0.2[401f7000+211000]"
>  - on exit: 
>    - the last log is Shutting down WebService... (just before shutdown)
>    - a log is output: "segfault at 0 ip 402744c0 sp bff07660 error 4 in libcppcms.so.1.0.2[401f7000+211000]"
>
>    - the application doesn't hang in the background
>    - no log is output between   m_service->run(); and delete m_service; 
>
>
>Any ideas what could be wrong?
>
>
>Sab
>
>
>2013/3/14 Artyom Beilis <art...@ya...>
>
>Few points:
>>
>>
>>a) Enable this option: http://cppcms.com/wikipp/en/page/cppcms_1x_config#service.disable_global_exit_handling to prevent from the CppCMS service to install signal handlers.
>>
>>
>>b) Put the log between
>>
>>
>>   m_service->run(); 
>>    << Log exited 
>>   delete m_service;
>>
>>
>>To see if service exits.
>>
>>
>>And probably put log after the delete to make sure that thread competes.
>>
>>
>>
>>Note the run() would not exit until all the worker threads had completed the job.
>>
>>
>>c) Why don't you put cppcms::service on the stack such that it would not leak in case of exception...
>>
>>you code is not exception safe.
>> 
>>Artyom Beilis
>>--------------
>>CppCMS - C++ Web Framework:   http://cppcms.com/
>>CppDB - C++ SQL Connectivity: http://cppcms.com/sql/cppdb/
>>
>>
>>
>>>________________________________
>>> From: Sab <rim...@gm...>
>>>To: cpp...@li... 
>>>Sent: Thursday, March 14, 2013 11:03 AM
>>>Subject: [Cppcms-users] Shutdown issue
>>> 
>>>
>>>Hallo Artyom,
>>>
>>>I am running the cppcms::service in a separate thread. When the calling thread 
>>>restarts, I would also like to restart the cppcms service. On restart, I am 
>>>calling service.shutdown() from the main tread that executed it. I see the log 
>>>before the shutdown call but the log after the call is not printed -> I suspect 
>>>that the function hangs up because after the application exits the process still 
>>>keeps running in the background. This is my application’s main:
>>>
>>>(Sorry for the code formatting...)
>>>
>>>int main(int argc, char* argv[]) 
>>>{
>>>. . .
>>>do
>>>{
>>>. . .
>>>//start WebService
>>>WebService webService(connector);
>>>LOG_MAIN << "Starting the WebService thread";
>>>boost::thread webServiceThread(webService);
>>>. . .
>>>
>>>while ( system.IsRunning() && !shutdownSignalReceived )
>>>{
>>>. . .
>>>}
>>>
>>>//stop WebService
>>>LOG_MAIN << "Stopping
 WebService...";
>>>webService.ShutDown();
>>>webServiceThread.join();
>>>. . .
>>>} 
>>>while (runState == Common::Devices::Run::Reload);
>>>}
>>>
>>>------------------
>>>My WebService class:
>>>
>>>void WebService::operator()()
>>>{
>>>try
>>>{
>>>. . .
>>>m_service = new cppcms::service(serviceConfig);
>>>m_service->applications_pool().
>>>mount(cppcms::applications_factory<MainWebHandler>
>>>(m_connector));
>>>m_service->run();
>>>delete m_service;
>>>}
>>>catch(std::exception const &e)
>>>{
>>>LOG_MAIN_ERROR << "WebService exception: " << e.what();
>>>}
>>>}
>>>
>>>void WebService::ShutDown()
>>>{
>>>try
>>>{
>>>cout << "Shutting down WebService..." << endl;
>>>m_service->shutdown();
>>>cout << "Shutting down WebService finished." << endl;
>>>}
>>>catch(std::exception const &e)
>>>{
>>>LOG_MAIN_ERROR << "WebService exception: " << e.what();
>>>}
>>>}
>>>
>>>---------------
>>>I
 don't get any error or exception. As mentioned I see the log “Shutting down 
>>>WebService...” but I don’t see “Shutting down WebService finished.” that’s why I 
>>>think the service doesn’t shut down properly so the thread keeps running in the 
>>>background.
>>>
>>>Do you see anything wrong with my code?
>>>
>>>Sab
>>>
>>>
>>>
>>>------------------------------------------------------------------------------
>>>Everyone hates slow websites. So do we.
>>>Make your web apps faster with AppDynamics
>>>Download AppDynamics Lite for free today:
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>>>_______________________________________________
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>>>Cpp...@li...
>>>https://lists.sourceforge.net/lists/listinfo/cppcms-users
>>>
>>>
>>>
>>------------------------------------------------------------------------------
>>Everyone hates slow websites. So do we.
>>Make your web apps faster with AppDynamics
>>Download AppDynamics Lite for free today:
>>http://p.sf.net/sfu/appdyn_d2d_mar
>>_______________________________________________
>>Cppcms-users mailing list
>>Cpp...@li...
>>https://lists.sourceforge.net/lists/listinfo/cppcms-users
>>
>>
>
>
>