Hi. I want to create a simple progress bar, and do not need any user input. I cannot block my main app as it already has its own GUI.

What will happen if I use the following from a worker thread ?

Fl_Window win(220,90);

win.begin(); // add progress bar to it..

Fl_Progress *progress = new Fl_Progress(10,50,200,30);

progress->minimum(0); // set progress range to be 0.0 ~ 1.0

progress->maximum(1);

progress->color(0x88888800); // background color

progress->selection_color(0x4444ff00); // progress bar color

progress->labelcolor(FL_WHITE); // percent text color 50 

win.end();

win.show();

Fl::run();

And I update it from main thread.

progress->value(t/500.0); 

progress->label(percent); // update progress bar's label

Fl::check();

I read the docs, and its clear that the main thread owns the window, but if I dont care about user input, is there any harm in this ?