I have solved this issue earlier, but whenever I use awake() in a new code, I have this problem.

This is the skeleton of my code and fortunately I am able to recreate the problem here :

#include "dummyClass.h"
#include <FL/Fl_Double_Window.H>
#include "pthread.h"

using namespace std;

IWindow *win1;
int f = 0;

static void update(void *p) {
    cout << "updating..." << endl;
    win1->setBtnValue(f);
    f++;
}

class AppManager : public IManager {

    IWindow *win;
public:
    void setWindow(IWindow *win) {
        this->win = win;
        win1 = win;
    }

    static void* doIt(void* p) {
        while(1) {
            cout << "doing it!" << endl;
            int i = 0;
            Fl::awake(update, (void*)i);
            sleep(2);
        }
    }

    void notify() {
        cout << "process started!" << endl;

        pthread_t t;
        pthread_create(&t, NULL, AppManager::doIt, (void*)this);
    }

    void setData(std::string data) {
        cout << data << endl;
    }
};

int main(int argc, char **argv)
{

    IManager *manager = new AppManager();
    IWindow *win = new dummyWin();

    ((dummyWin*)win)->setManager(manager);
    manager->setWindow(win);

    ((dummyWin*)win)->show();
    return Fl::run();
}

If I use, update without awake(), the changes are not observed on the widget. If I call it in awake(), the function is not called.
Where am I going wrong?

Regards
Harsh