Re: [Cppcms-users] some graceful way to close the CppCMS app
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Re: [Cppcms-users] some graceful way to close the CppCMS app
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From: Artyom B. <art...@ya...> - 2012-07-02 19:02:02
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For this case I'd suggest to install signal handler for SIGHUP
static cppcms::service *srv;
static bool got_sighup;
handler()
{
got_sighup = true;
the_service->shutdown();
}
And in main()
while(1) {
cppcms::service srv(...)
srv.run();
if(got_sighup) {
got_sighup = false;
continue;
}
break;
}
So when application gets SIGHUP it restarts / reloads
and upon SIGTERM exits.
This is what SIGHUP is usually used - reload configuration.
Artyom Beilis
--------------
CppCMS - C++ Web Framework: http://cppcms.com/
CppDB - C++ SQL Connectivity: http://cppcms.com/sql/cppdb/
>________________________________
> From: Lee Elenbaas <lee...@gm...>
>To: Artyom Beilis <art...@ya...>; cpp...@li...
>Sent: Monday, July 2, 2012 12:12 PM
>Subject: Re: [Cppcms-users] some graceful way to close the CppCMS app
>
>
>This opens up a much better option - performing my loop inside the C++ code and no in the shell script running it.
>And i can also return a shutdown reason using some static variable in order to control that loop - somewhat ugly this usage of static but works, and better then sending it over to the shell.
>
>the main will be something like below
>and the usage will be something like:
>
>
>runflag = 2; // reconfig
>srv.shutdown();
>
>
>On Mon, Jul 2, 2012 at 11:57 AM, Artyom Beilis <art...@ya...> wrote:
>
>Like any other process:
>>
>>
>>
>>Do stuff like this:
>>
>>
>static int runflag = 1; // 1 for initial run - enum will probably be a better solution in a real code
>
>int main(...)
>>{
>>
>> try {
> while (runflag) {
> runflag=0;
> cppcms::service srv(...)
>> srv.run();
> if (runflag == 2) {
> // apply reconfiguration to disk
> }
> }
> }
>> catch(std::exception const &) {
>> //Some problem
>> return 1;
>>
>> }
>> return 0; // exited normally
>>
>>}
>>
>>
>>srv.run() returns upon srv.shutdown() (that is called by SIGTERM handler)
>>
>>
>>Artyom Beilis
>>--------------
>>CppCMS - C++ Web Framework: http://cppcms.com/
>>CppDB - C++ SQL
Connectivity: http://cppcms.com/sql/cppdb/
>>
>>
>>
>>>________________________________
>>> From: Lee Elenbaas <lee...@gm...>
>>>To: Artyom Beilis <art...@ya...>; cpp...@li...
>>>Sent: Monday, July 2, 2012 10:53 AM
>>>Subject: Re: [Cppcms-users] some graceful way to close the CppCMS app
>>>
>>>
>>>
>>>Is there some way to return an error code to the program that run the cppcms app?
>>>i would like to provide some conditioned loop in my batch/shell script
>>>
>>>
>>>thanks
>>>
>>>
>>>On Mon, Jul 2, 2012 at 10:34 AM, Artyom Beilis <art...@ya...> wrote:
>>>
>>>Two options:
>>>>
>>>>
>>>>1. Send a SIGTERM signal to the application service it will shutdown gracefully.
>>>>2. >From the application itself, use cppcms::service::shutdown()
>>>>
>>>>
>>>>The open requests that started processing .i.e. it is processed in the thread_pool
>>>>would be completed. The connections that had not got to thread pool (not started processing)
>>>>
>>>>and asynchronous connections will be closed.
>>>>
>>>>Artyom Beilis
>>>>--------------
>>>>CppCMS - C++ Web Framework: http://cppcms.com/
>>>>CppDB - C++ SQL Connectivity: http://cppcms.com/sql/cppdb/
>>>>
>>>>
>>>>
>>>>>________________________________
>>>>> From: Lee Elenbaas <lee...@gm...>
>>>>>To: cpp...@li...
>>>>>Sent: Monday, July 2, 2012 10:17 AM
>>>>>Subject: [Cppcms-users] some graceful way to close the CppCMS app
>>>>>
>>>>>
>>>>>
>>>>>Hi All,
>>>>>
>>>>>
>>>>>Is there some gracefull way to close the CppCMS so that it will stop accepting new requests, finish handle the currently open requests and then close down with a given error code.
>>>>>In my situation i sometimes need to close the app change the configuration and then run it again. And i am looking for a gracefull way to perform that.
>>>>>(Yes i know that the embeded web server is not for production - but for my case i think it is the best option right now. I would have to bundle a webserver with my app anyway, so using this and configuring it to answer only localhost seems like a good enough option for now)
>>>>>
>>>>>--
>>>>>--
>>>>>lee
>>>>>Lee Elenbaas
>>>>>lee...@gm...
>>>>>
>>>>>
>>>>>------------------------------------------------------------------------------
>>>>>Live Security Virtual Conference
>>>>>Exclusive live event will cover all the ways today's security and
>>>>>threat landscape has changed and how IT managers can respond. Discussions
>>>>>will include endpoint security, mobile security and the latest in malware
>>>>>threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
>>>>>_______________________________________________
>>>>>Cppcms-users mailing list
>>>>>Cpp...@li...
>>>>>https://lists.sourceforge.net/lists/listinfo/cppcms-users
>>>>>
>>>>>
>>>>>
>>>>------------------------------------------------------------------------------
>>>>Live Security Virtual Conference
>>>>Exclusive live event will cover all the ways today's security and
>>>>threat landscape has changed and how IT managers can respond. Discussions
>>>>will include endpoint security, mobile security and the latest in malware
>>>>threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
>>>>_______________________________________________
>>>>Cppcms-users mailing list
>>>>Cpp...@li...
>>>>https://lists.sourceforge.net/lists/listinfo/cppcms-users
>>>>
>>>>
>>>
>>>
>>>
>>>--
>>>--
>>>lee
>>>Lee Elenbaas
>>>lee...@gm...
>>>
>>>
>>>------------------------------------------------------------------------------
>>>Live Security Virtual Conference
>>>Exclusive live event will cover all the ways today's security and
>>>threat landscape has changed and how IT managers can respond. Discussions
>>>will include endpoint security, mobile security and the latest in malware
>>>threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
>>>_______________________________________________
>>>Cppcms-users mailing list
>>>Cpp...@li...
>>>https://lists.sourceforge.net/lists/listinfo/cppcms-users
>>>
>>>
>>>
>>------------------------------------------------------------------------------
>>Live Security Virtual Conference
>>Exclusive live event will cover all the ways today's security and
>>threat landscape has changed and how IT managers can respond. Discussions
>>will include endpoint security, mobile security and the latest in malware
>>threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
>>_______________________________________________
>>Cppcms-users mailing list
>>Cpp...@li...
>>https://lists.sourceforge.net/lists/listinfo/cppcms-users
>>
>>
>
>
>
>--
>--
>lee
>Lee Elenbaas
>lee...@gm...
>
>
>------------------------------------------------------------------------------
>Live Security Virtual Conference
>Exclusive live event will cover all the ways today's security and
>threat landscape has changed and how IT managers can respond. Discussions
>will include endpoint security, mobile security and the latest in malware
>threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
>_______________________________________________
>Cppcms-users mailing list
>Cpp...@li...
>https://lists.sourceforge.net/lists/listinfo/cppcms-users
>
>
> |
