Re: [Cppcms-users] Booster::aio's behavior

[CN <cn...@fa...>]

On Wed, Sep 30, 2015, at 06:32 PM, Artyom Beilis wrote:
> Your problem is this
>
> io_service.set_timer_event(booster::ptime::now(),boost::bind(&MyClass-
> ::work,this,_1));        io_service.run();
>
>
> You are using main io_service and calling it's "run()" member function
> also run is called by cppcms::service it is wrong and also you try to
> stop it.

Now I know booster::aio::stop can only be called once. I will leave the
call of stop() to cppcms::service.

> i.e. instead of     booster::aio::io_service &io_service; just put
>      your own booster::aio::io_service io_service and don't use main
>      one (as you are running it in your own thread) and now you can
>      start/stop it.


I have no problem using an independent instance of
booster::aio::io_service in "MyClass".

What confuses me is the statements:

"Multiple threads may call io_service::run() to set up a pool of threads
from which completion handlers may be invoked."

and

"Asynchronous completion handlers will only be called from threads that
are currently calling io_service::run()."

as mentioned here:
http://www.boost.org/doc/libs/1_53_0/doc/html/boost_asio/overview/core/threads.html

My understanding of the first statement is that
boost::asio::io_service::run()  can be called by multiple threads. If
booster::aio::io_service is compatible with boost in this regard, then
booster::aio::io_service::run() can also be called in main thread and
the thread running the instance of "MyClass". Am I correct?

> Or use main event loop (with reference) than do not create a thread
> and do not start/stop io_service and do not create thread.

Because MyClass::work() does time consuming job, I prefer to running it
in another thread.
>> **From:** CN <cn...@fa...> **To:** cppcms-
>> us...@li... **Sent:** Wednesday, September 30, 2015
>> 5:37 AM **Subject:** [Cppcms-users] Booster::aio's behavior
>>
>> The following program does not terminate until 10 seconds has passed.
>> I want to terminate it immediately once I type "kill -SIGTERM". Is
>> that possible? How do I achieve that?
>> -------
>> class MyClass { private:    booster::aio::io_service &io_service;
>> booster::aio::deadline_timer timer; public:
>> MyClass(booster::aio::io_service &io_service)        :
>> io_service(io_service),timer(io_service){}    void start()    {
>> io_service.set_timer_event(booster::ptime::now(),boost::bind(&MyClas-
>> s::work,this,_1));        io_service.run();    }    void
>> work(booster::system::error_code const &e)    {        if(e)
>> return;        //do_my_job(); Do periodic job here.
>> timer.expires_from_now(booster::ptime::seconds(10);
>> timer.async_wait(boost::bind(&MyClass::work,this,_1));    }    void
>> stop()    {        io_service.stop();    } };
>>
>> cppcms::service *service; void signal_handler(int signal_number) {
>> service->shutdown(); }
>>
>> int main(int argc,char **argv) {    //init_signal_trap(); Initialize
>> signal trap here.    while(true){        service=new
>> cppcms::service(argc,argv);        service-
>> >applications_pool().mount(cppcms::applications_factory<my_app>(),cp-
>> pcms::mount_point(".*",1));        booster::shared_ptr<MyClass>
>> mc(new        MyClass(service->get_io_service()));
>> booster::thread t(boost::bind(&MyClass::start,mc));        service-
>> >run();        //Type "kill -SIGTERM" in OS so that signal_handler()
>> gets called here.        mc->stop();        t.join();
>> //Program does not reach here until 10 seconds passes!
>> if(caught_signal > 0){            switch (caught_signal){
>> case 1: //SIGHUP                case 14:{ //SIGALRM
>> //Restart application.                    caught_signal=0;
>> break;                }                default:{
>> //Terminate program.                    //case 2: //SIGINT
>> //case 15: //SIGTERM                    //caught_signal=0;
>> return 0;                }            } //switch        } //if    }
>> //while }
>> -------
>> Best Regards, CN
>>
>> --
>> http://www.fastmail.com [1]- The way an email service should be
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