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List:       kde-devel
Subject:    Re: QThread  C++
From:       Patrick Julien <freak () ideasandassociates ! com>
Date:       2002-04-07 17:10:48
[Download RAW message or body]

your thread object goes out of scope...

The "pure virtual method called" is the error message produced by gcc 
when you call a virtual method on a delete object.


Davi Leal wrote:

>I have a QThread + QApplication 'main()' which crash 40% times. The output of 
>the crash is:
>
>$ ./shopsuite
>Connected to the data base: shop
>Listening products: shop
>pure virtual method called  <----
>Aborted                     <----
>$
>
>
>See below. If I uncomment the poolDB.wait() line the application never crash, 
>however only when the QThread finish the application follows executing up to 
>the "return app.exec()" event loop.
>
>Maybe, is it due to I use the QApplication object. Must I convert the 
>QApplication process into a second QThread to avoid the crash?.  Any idea?.
>
>
>int main(int argc, char* argv[])
>{
>	QApplication app( argc, argv );
>	[...]
>			 PoolDB poolDB;
>			 poolDB.start();
>			 /* poolDB.wait();  COMMENTED <------------*/
>	
>			break; // Go out to the normal event loop 'app.exec()'
>		}
>	}
>
>	return app.exec();
>}
>
>
>
>---
>Qt 2.3.1
>	ii  libqt2         2.3.1-22       Qt GUI Library (runtime version).
>	ii  libqt2-mt      2.3.1-22       Qt GUI Library (runtime threaded version).	
>Postgres 7.2.1
>
>c++ -DQT_THREAD_SUPPORT 
>c++  -Wall -g -O2   -lqt-mt 
>
>Debian GNU/Linux 'sid'
>
>
>
>
>
>
>
>
>
>
>
>
>
>--
>The below example from Qt 2.3 doc works rightly:
>
>
>#include <qapplication.h>
>
>#include <qthread.h>
>
>
> class MyThread : public QThread {
>
>  public:
>
>    virtual void run();
>
>  };
>
>  void MyThread::run()
>  {
>    for(int count=0;count<20;count++) {
>      sleep(1);
>      qDebug("Ping!");
>    }
>  }
>
>  int main()
>  {
>      MyThread a;
>      MyThread b;
>      a.start();
>      b.start();
>      a.wait();
>      b.wait();
>  }
>
>g++ -DQT_THREAD_SUPPORT -Wall -O2 -o test test.cpp -I/usr/include/qt/ -lqt-mt
> 
>
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