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List:       kde-devel
Subject:    QThread  C++
From:       Davi Leal <davileal () terra ! es>
Date:       2002-04-07 13:22:23
[Download RAW message or body]

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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