Question

I have created an abstract base class to allow for multiple implementation of a task, which can be called generically via MFC dialog. This task needs to be able to be interrupted if the user clicks cancel.

abstract_dll.h:

class abstract_dll
{
public:
    virtual void my_task(CFeedback *fb)=0;
}

Where CFeedback is an abstract class to control user feedback (ie. progress bar)

concrete_dll.h:

class concrete_dll 
{
    virtual void my_task(CFeedback *fb)
    {
        //do some work
        //step progress bar
        boost::this_thread::interruption_point();

        //do some work
        //step progress bar
        boost::this_thread::interruption_point();
    }
}

extern "C" abstract_dll* get_class() { return new concrete_dll(); }

Now within the MFC Dialog I load the appropriate concrete_dll and initialize my abstract_dll *dll = module->get_class();

Then start a new boost::thread which calls the dll->my_task(fb);

Then when I call thread.interrupt(). The thread is never interrupted, and it never excepts at my interruption_points. I have traced the thread ID it is the same until we’re in the concrete_dll implementation, then I just get 0x0000 for the thread id.

Any thoughts? PS. The code above is just pseudo code for what I have. My actual code compiles and runs, I just can’t get it to interrupt.

Answer 1

I think the answer to your question is here:

http://lists.boost.org/boost-users/2010/01/55171.php

In short: you need to link to DLL version of boost:threads both in your project and DLL. Just put the:

#define BOOST_THREAD_USE_DLL

before <boost/thread.hpp> inclusion (or in the project propeties)

BR