To add to my previous message, if instead of creating a new thread I create a
timeout to call "tm_function" there is no delay in displaying window contents.
> Hello,
>
> In FLTK 1.1.X, I'm observing unexpected delay in displaying window contents,
> if I there is a CPU consuming operation before displaying the window. I'm
> attaching an example code that shows this problem. To compile it save it as
> test.cpp and just type:
>
> g++ test.cpp -o test `fltk-config --ldflags`
>
> Note that the tm_function executes a busy for loop followed by creating and
> displaying a window. The problem is that the Fl_Button in the window is shown
> about 1 or 2 seconds later than the window itself is shown.
>
> I would expect both the window and the button in it to be shown at the same
> time.
>
> Any help in shedding light to this problem is appreciated.
> Oguz
>
>
> #include <FL/Fl.H>
> #include <FL/Fl_Double_Window.H>
> #include <Fl/Fl_Button.H>
> #include <cmath>
> #include <cstdio>
> #include <pthread.h>
>
> void* tm_function(void* data)
> {
> for(int i = 0; i < 10000000; ++i)
> {
> double x = pow(i / 10000000., 2.2);
> }
>
> Fl_Double_Window* testWnd = new Fl_Double_Window(400, 400, "Test Window");
> Fl_Button* btn = new Fl_Button(100, 100, 60, 25, "Button");
> testWnd->end();
> testWnd->redraw();
> testWnd->show();
> Fl::check();
> }
>
> void btn_callback(Fl_Widget* o, void* data)
> {
> Fl_Double_Window* mainWindow = (Fl_Double_Window*) o->parent();
> mainWindow->hide();
>
> //Fl::add_timeout(0.1, tm_function, NULL);
> pthread_t tid;
> pthread_create(&tid, NULL, tm_function, NULL);
> }
>
> int main(int argc, char *argv[])
> {
> Fl::scheme("plastic");
>
>
> Fl_Double_Window* wnd2 = new Fl_Double_Window(800, 600, "Big Window");
> wnd2->end();
> wnd2->show();
>
> Fl_Double_Window* wnd = new Fl_Double_Window(500, 500, "My Window");
> Fl_Button* btn = new Fl_Button(100, 100, 100, 25, "Press Me!");
> wnd->end();
> wnd->show();
>
>
> btn->callback(btn_callback, NULL);
>
> Fl::run();
> return 0;
> }
>
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