Re: [Boost-users] ASIO Win32 Thread not terminated

16 Sep 2010

      Hi Igor, Michi,

-------- Original-Nachricht --------
...
Datum: Wed, 15 Sep 2010 16:14:20 +0200
Von: michi7x7 
An: boost-users@lists.boost.org
Betreff: Re: [Boost-users] ASIO Win32 Thread not terminated
...
Hi manuel,
...
You're right, the number of threads doesn't increase when I create more
clients.
Still, I'd like to know when these threads terminate. Do they
nescessarily run until the app exits, or is there a way of telling asio 'hey, I'm
done with sockets now, no need to keep these threads running'.
i think the threads are terminated when the destructor of the io_service 
is called. Creating threads is too expensive, to kill them everytime the 
program is idle. So they are usually left in a blocked state.
You can try this by putting an iostream into brackets {} and set a 
breakpoint afterwards.
yes, that's what I thought, too. But in the example, the whole code is already in {} (the try block) and the threads are still there when reaching the return statement at the end of main (even if I give them time to finish by using a sleep or a for-loop).
I also get the same behaviour if I change the main function like that:

  boost::asio::io_service* io_service = new  boost::asio::io_service;
  try
  {   
    client c( *io_service, "localhost", "80" );
    client c2( *io_service, "www.heise.de", "80" );
    client c4( *io_service, "www.google.de", "80" );
    io_service->run();
  }
  catch (std::exception& e)
  {
    std::cout << "Exception: " << e.what() << "\n";
  }
  delete io_service;
  // sleep or for-loop here changes nothing
  return 0;
}

-> still two additional threads running here.

Anyway, thanx for your help!

best

Manuel
...
If the threads are still running, they might be killed using an old 
C-technique, called atexit().
Regards, michi7x7
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Re: [Boost-users] ASIO Win32 Thread not terminated

Manuel Drews