Re: [Cppcms-users] Unmount asynchronous application from application pool

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Well thanks for the really helpful reply (not).

What about telling me what i CAN do instead and maybe putting it somewhere
on the wiki?
Would be helpful to others, too I guess.

On Sun, Nov 17, 2013 at 10:10 PM, Artyom Beilis <art...@ya...> wrote:

> I can't just tell that you did something wrong. You did almost everything
> wrong
>
> YOU CAN NOT PUT ANY FUNCTION IN SIGNAL HANDLER, your function must be
> SIGNAL SAFE
> You can only call service->shutdown() as it is expicitly defined and
> SIGNAL SAFE.
>
> You can't throw exceptions from signal handlers
> you can't do I/O via iostream. and much just call shutdown and handle all
> you need when service::run() exits...
>
>
> Artyom Beilis
> --------------
> CppCMS - C++ Web Framework:   http://cppcms.com/
> CppDB - C++ SQL Connectivity: http://cppcms.com/sql/cppdb/
>
> --------------------------------------------
> On Fri, 11/15/13, DieterM75 . <die...@gm...> wrote:
>
>  Subject: Re: [Cppcms-users] Unmount asynchronous application from
> application pool
>  To: cpp...@li...
>  Date: Friday, November 15, 2013, 8:11 PM
>
>  Hey,
>
>  I tried the following code:
>
>  http://pastie.org/8483126
>
>  Output is as follows:
>
>
>
>  2013-11-15
>  18:31:25; Activator, debug: Created service!
>  (main.cpp:70)
>  2013-11-15
>  18:31:25; App, debug: ctor (main.cpp:36)
>  Exception!
>  2013-11-15
>  18:31:28; App, debug: dtor (main.cpp:39)
>  2013-11-15
>  18:31:48; main, debug: Restarting service!
>  (main.cpp:106)
>  2013-11-15
>  18:34:43; Activator, debug: Created service!
>  (main.cpp:70)
>  2013-11-15
>  18:34:43; Activator, debug: Created service!
>  (main.cpp:70)
>  2013-11-15
>  18:34:43; App, debug: ctor (main.cpp:36)
>  2013-11-15
>  18:34:43; App, debug: ctor (main.cpp:36)
>  Exception!
>  2013-11-15
>  18:35:33; App, debug: dtor (main.cpp:39)
>  2013-11-15
>  18:35:33; App, debug: dtor (main.cpp:39)
>  2013-11-15
>  18:35:40; main, debug: Restarting service!
>  (main.cpp:106)
>  2013-11-15
>  18:35:40; main, debug: Restarting service!
>  (main.cpp:106)
>  2013-11-15
>  18:41:44; Activator, debug: Created service!
>  (main.cpp:70)
>  2013-11-15
>  18:41:44; Activator, debug: Created service!
>  (main.cpp:70)
>  2013-11-15
>  18:41:44; Activator, debug: Created service!
>  (main.cpp:70)
>  2013-11-15
>  18:41:44; App, debug: ctor (main.cpp:36)
>  2013-11-15
>  18:41:44; App, debug: ctor (main.cpp:36)
>  2013-11-15
>  18:41:44; App, debug: ctor (main.cpp:36)
>  Exception!
>  2013-11-15
>  18:41:58; App, debug: dtor (main.cpp:39)
>  2013-11-15
>  18:41:58; App, debug: dtor (main.cpp:39)
>  2013-11-15
>  18:41:58; App, debug: dtor (main.cpp:39)
>  2013-11-15
>  18:43:16; main, debug: Restarting service!
>  (main.cpp:106)
>  2013-11-15
>  18:43:16; main, debug: Restarting service!
>  (main.cpp:106)
>  2013-11-15
>  18:43:16; main, debug: Restarting service!
>  (main.cpp:106)
>  2013-11-15
>  18:43:22; Activator, debug: Created service!
>  (main.cpp:70)
>  2013-11-15
>  18:43:22; Activator, debug: Created service!
>  (main.cpp:70)
>  2013-11-15
>  18:43:22; Activator, debug: Created service!
>  (main.cpp:70)
>  2013-11-15
>  18:43:22; Activator, debug: Created service!
>  (main.cpp:70)
>  2013-11-15
>  18:43:22; App, debug: ctor (main.cpp:36)
>  2013-11-15
>  18:43:22; App, debug: ctor (main.cpp:36)
>  2013-11-15
>  18:43:22; App, debug: ctor (main.cpp:36)
>  2013-11-15
>  18:43:22; App, debug: ctor (main.cpp:36)
>  Maybe someone sees the error in my code, I clearly
>  dont :)
>
>
>
>  Sincerely
>  Dieter
>
>  ---------- Forwarded
>  message ----------
>  From: Artyom
>  Beilis <art...@ya...>
>
>
>  Date: Sat, Nov 9, 2013 at 12:54 PM
>  Subject: Re: [Cppcms-users] Unmount asynchronous application
>  from application pool
>  To: cpp...@li...
>
>
>
>
>  There two things.
>
>
>
>  - The tutorial describes the situation were the ENTIRE
>  cppcms service is reloaded. In case of pointers to
>  asynchronous applications, you can reset them withing
>  if(got_sighup) { ... } section.
>
>
>
>  Additionally you can remove the asynchronous application by
>  simply expiring its pointer. Once all the references (for
>  example kept in callbacks) and your reference are expired it
>  would be deleted. Asynchronous applications can be removed
>  and added dynamically (unlike synchronous ones that only can
>  be added)
>
>
>
>
>
>
>
>  Artyom Beilis
>
>  --------------
>
>  CppCMS - C++ Web Framework:   http://cppcms.com/
>
>  CppDB - C++ SQL Connectivity: http://cppcms.com/sql/cppdb/
>
>
>
>  --------------------------------------------
>
>  On Fri, 11/8/13, DieterM75 . <die...@gm...>
>  wrote:
>
>
>
>   Subject: [Cppcms-users] Unmount asynchronous application
>  from application pool
>
>   To: cpp...@li...
>
>   Date: Friday, November 8, 2013, 9:58 AM
>
>
>
>   Hello,
>
>
>
>   I mount my application via the
>  mount(booster::intrusive_ptr)
>
>   method of the application pool class.
>
>   I also try to implement some kind of reload mechanism,
>
>   so that the service can start over again after certain
>
>   errors.
>
>
>
>   The example "reload the application" (
> http://cppcms.com/wikipp/en/page/cppcms_1x_reload_application)
>
>   does not cover how to deal with asynchronous
>  applications.
>
>   If I pass an anonymous intrusive_ptr reference to the
>
>   method, it gets created and destroyed immediately. Now if
>
>   the signal gets handled and the service shutdown, the
>
>   mounted application gets constructed and destroyed twice.
>
>   Basically every time the signal is processed, the
>
>   application pool does not automatically destroy the long
>
>   running apps.
>
>
>
>   Is there a way to avoid this problem?
>
>
>
>   Sincerely
>
>   Müller
>
>
>
>
>
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>
>  from the latest Intel processors and coprocessors. See
>  abstracts and register
>
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