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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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