Threading issue in DLL

Hi,

I have a low level HW communication interface, which I would like to embed into a DLL.

I create and starts a QThread, and in this tread's run loop, I create a simple handler object which I start with a QTimer:singleShot

My problem:

Everything works, as long I run the the Application from QtCreator (either in Debug or Release mode - both works)

But when I build a static release version, the eventloop seems to stop or never start.

I have build a very basic solution, for anyone to inspect.

Please advice - Thanks

Static build will probably not allow you to load a dynamic library.

Hi,

The DLL is loaded alright, I'm able to call functions getConst and getCounter in IBHandler, when it is loaded.

But the mainloop in IBHandler is not running.

Code:

---

#include "ibkernel.h"
 
IBKernel::IBKernel(QObject *parent) :
    QThread(parent)
{
}
 
IBKernel::~IBKernel()
{
 
}
 
IBHandler* IBKernel::getHandler()
{
    return handler;
}
 
void IBKernel::startKernel()
{
    exec();
}
 
void IBKernel::stopKernel()
{
    quit();
}
 
void IBKernel::run()
{
    handler = new IBHandler();
    //handler->moveToThread(this);
    QTimer::singleShot(10, handler, SLOT(MainLoop()));
 
    exec();
 
    delete handler;
    handler = 0;
}

---

Code:

---

#include "ibhandler.h"
 
IBHandler::IBHandler(QObject *parent) :
    QObject(parent)
{
    mainLoopCnt = 30;
}
 
IBHandler::~IBHandler()
{
 
}
 
int IBHandler::getCounter()
{
    return mainLoopCnt;
}
 
int IBHandler::getConst()
{
    return 99;
}
 
void IBHandler::MainLoop()
{
    // THIS STOPS or NEVER STARTS in the static released version
 
    mainLoopCnt++;
 
    QTimer::singleShot(0, this, SLOT(MainLoop()));
}

---

have you statically built qt libraries as well?

Hi,

Yep! - All libs statically build. And used to build both the TestLibTest application and the DLL

Problem found!

In standalone mode the DLL seems to need a QCoreApplication for the QTimer to work

Thanks anyway

In any configuration QCoreApplication is needed for timers to work.