Re: [Boost-users] Why boost::asio doesn't work???

Subject: Re: [Boost-users] Why boost::asio doesn't work???
From: Alex Black (alex_at_[hidden])
Date: 2009-07-27 12:29:51

Igor, that doesn't seem correct to me, from what I can tell (by reading the docs, and using it) is that io_service::run() will not return immediately if there is no work.

http://eckhart.stderr.org/doc/libasio-doc/reference/a00032.html#c84bed0d1dd061bc71010ba1228439da 

"The run() function blocks until all work has finished and there are no more handlers to be dispatched, or until the io_service has been stopped."

> -----Original Message-----
> From: boost-users-bounces_at_[hidden] 
> [mailto:boost-users-bounces_at_[hidden]] On Behalf Of Igor R
> Sent: Monday, July 27, 2009 6:31 AM
> To: boost-users_at_[hidden]
> Subject: Re: [Boost-users] Why boost::asio doesn't work???
> 
> The message title a bit missleading: it's not asio that 
> doesn't work, but your application :).
> Please see the comments below.
> 
> > msgSrv::msgSrv(int listenPort) {
> >    // TODO Auto-generated constructor stub
> >    this->listenPort = listenPort;
> >    try {
> >        asioIoService = new asio::io_service();
> >        asioSocket = new asio::ip::udp::socket(*asioIoService,
> >                asio::ip::udp::endpoint(asio::ip::udp::v4(),
> > listenPort)); //new asio::ip::udp::socket_(*asioIoService,
> > udp::endpoint(udp::v4(), listenPort));
> >    } catch (std::exception &e) {
> >        std::cerr << "Error initializing ioservice or socket:" << 
> > e.what();
> >    }
> >    asioIoService->run();
> 
> You run() io_service that doesn't have any work, so run() 
> exits immediately. Then you enqueue some async.request, and 
> your applciation exits, freeing "msgSrv" object and deleting 
> the io_service and the socket. The request you enqueued is 
> still alive, but an attempt to process it causes crash, 
> because you already deleted all the asio stuff...
> Note that if io_service had some work (eg, pending async_XXX 
> requests, or asio::work object) before you called run(), it 
> would block until all the work is processed.
> Please see asio tutorial and examples for more information.
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