Unresolved timer events

[A Former User]

A mini sample file main.cpp:

@ #include <iostream>
#include <QCoreApplication>

class MyApp : public QCoreApplication
{
private:
    int m_idtimer;

public:
    MyApp(int nargs, char* argc[]) : QCoreApplication(nargs, argc)
    {
        m_idtimer = startTimer(3000); // 3 segs.
    }

protected:
    void timerEvent(QTimerEvent* e)
    {
        char c = '\0';

        std::cout << "timerEvent" << std::endl;
        std::cin >> c;

        if (c == 'q') {
            killTimer(m_idtimer);
            quit();
        }
    }
};

int main(int nargs, char* argc[])
{
    MyApp app(nargs, argc);

    return app.exec();
}@

Extra mini Makefile:

@ LDFLAGS = -I/usr/include/qt4 -I/usr/include/qt4/QtCore
LDLIBS = -lQtCore@

Compiling and execution:

@ $ make main
g++ -I/usr/include/qt4/QtCore main.cpp -lQtCore -o main
$ ./main
timerEvent
1
timerEvent
2
timerEvent
3
timerEvent
q
$@

Ok and then, my question. I've made this sample with the purpose of testing if timer events are accumulative.

When I executing the main program, the next occurs:

the first timerEvent message is shown after 3 seconds, and timerEvent() waits a character.

I press 1 inmediatly.

3 seconds later, the second timerEvent message appear (as expected).

I wait some seconds (15 or more) and I press 2

The third message is shown immediatly (one timer event accumulated).

I press 3 immediatly.

And 3 seconds later the fourth message appear (no more timer events accumulated).

I press q and the program ends.

Question: Why aren there no more timer events accumulated? Does this behaviour depend on the platform?

PD: My Qt version is 4.8, my SO Ubuntu 13.04, and my kernel (linux) 3.8.0-19-generic. The running graphic system is Gnome 3.

[dbzhang800]

Yes, this behavior is platform dependent.

http://qt-project.org/wiki/QtTimers