On 30 Aug 2012, at 17:59, Bogdan Popescu wrote: > I'm not that good with threads... I gave it a go under Linux and it seems > to work fine for the first time it renders the window, after the second or > third try it might segfault (when calling Fl_Window::show() or Fl::run()) > and you cannot close the window opened by FLTK, also the window is redrawn > when a new message is received instead of spawning a new one... I'm > thinking the way FLTK works with threads is different, right now I have all > my FLTK code under the last called function, do you think I need to/should > initialize fltk in main() and then spawn windows from the running threads?
No, that isn't going to work - threading is not a drop-in for forking the process, on any platform; in particular many host systems will only permit the primary "main" thread to create new windows in a GUI context so you can not make new windows from the subsidiary threads. I guess this is analogous in some ways to the OSX fork behaviour where the subsidiary fork can't create windows - though there at least the "fix" is easy in that you can exec a new process in place of the child, and the new process can create windows. There is no easily managed way to do that from threads... So you *can* probably use threads to attain your goal, but it will require a fair amount of re-working of your code I suspect. > > Right now I replaced the fork calls with pthread (adding the > pthread_detach/join calls where needed), and stick Fl::lock/unlock in the > function that deals with FLTK... Hmm, very unlikely to work - see notes above, and refer to the "Advanced" section of the fltk manual (used to be Chapter 10 in the old fltk-1.1 docs...) > > I assume there must be a way of dealing with this without going for the > agent approach but thank you for your replies! For linux and OSX, the fork/exec way should work. For WinXX, you will probably need to consider the agent approach anyway, so that might be the path of least resistance overall? _______________________________________________ fltk mailing list fltk@easysw.com http://lists.easysw.com/mailman/listinfo/fltk
