Re: [Boost-users] throw and catch exception

Subject: Re: [Boost-users] throw and catch exception
From: Christer Borgqvist (christer.borgqvist10_at_[hidden])
Date: 2011-10-22 16:21:09

ok
if i have a catch(...) {

}
it is the same
//Christer
"Igor R" <boost.lists_at_[hidden]> skrev i meddelandet 
news:CAPnv1PKdbNi3kRJONS3W41wAQW69u6OxpNxzYOB0VqgdBfHb+w_at_mail.gmail.com...
>> i start a new thread,
>> the thread instance class Foo,
>> Foo foo;
>> try {
>> foo.exequte();
>> //foo.execute throw a std::exception
>> }
>> catch(std::exception) {
>>
>> }
>> if start one thread i catch the std::exception,
>>
>> but if i run several threads the app crash.
>> i start the thread like this
>> boost::thread t(boost::bind(newthread));
>
> If the thread function newthread() in the above code does not catch
> *all* the exceptions, then an uncaught exception would terminate your
> program. Just debug your application to see what exception is thrown
> and where.
>
>
>> I have a code like this
>>
>> when execute the IdHTTPServDataEMVObj.Exequte();
>> it will throw a std::runtime_error
>> if running one thread all is fine, the catch is excequted, but if running
>> two threads then the application crash.
>
> By saying "one thread" you mean "main thread only"? If so, you
> probably do catch some exception in the main thread, but don't catch
> it in the thread-function.
>
> <...>
>> void server(boost::asio::io_service& io_service, short port)
>> {
>> tcp::acceptor a(io_service, tcp::endpoint(tcp::v4(), port));
>> for (;;)
>> {
>> socket_ptr sock(new tcp::socket(io_service));
>> a.accept(*sock);
>> boost::thread t(boost::bind(socketclientEMVthread, sock, logFunc, 
>> mygetFunc, mybackFunc, statusUpdateFunc));
>> }
>> }
>
>
> FWIW, note that the the above code might throw exceptions...
>
>
>> void socketclientEMVthread( socket_ptr sock)
>>
>> {
>> cout << "connect on port " << sock->remote_endpoint().port() << endl;
>>
>> for (;;) {
>> char data[max_length];
>>
>> boost::system::error_code error;
>> size_t length = sock->read_some(boost::asio::buffer(data), error);
>> if (error == boost::asio::error::eof)
>> break; // Connection closed cleanly by peer.
>> else if (error)
>> throw boost::system::system_error(error); // Some other error.
>
> It seems that you never catch the above exception.
>
>
>> std::string trans_in(data), trans_out;
>>
>> CIdHTTPServDataEMVObj IdHTTPServDataEMVObj(trans_in);
>> try {
>> // this is thrown
>> IdHTTPServDataEMVObj.Exequte();
>> if ( IdHTTPServDataEMVObj.txBufferlen > 0 &&
>> IdHTTPServDataEMVObj.txBufferlen !=
>> std::string::npos) {
>> trans_out = IdHTTPServDataEMVObj.txBuffer;
>> }
>> else {
>> trans_out = trans_in;
>> }
>> }
>> catch(trans_error &te) {
>> trans_out = te.what();
>> boost::asio::write(*sock, boost::asio::buffer(trans_out,
>> trans_out.size()));
>> break;
>> }
>
> Catch all the exceptions here - even just for debugging purposes.
>
>
>> boost::asio::write(*sock, boost::asio::buffer(trans_out, 
>> trans_out.size()));
>> break;
>
> The above code might throw as well.
>
>
> HTH,
>
>
> Igor'.
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