Re: [fltk.general] Re: Window is frozen - Forums

On Sun, 28 Nov 2021, 10:39 Manolo wrote:

To call Fl_Browser::add() from a worker thread, you have to call Fl::lock() before and Fl::unlock() after.
See an example of how it's done in demo program test/threads.
Also, make sure you follow guidelines given in :
https://fltk.gitlab.io/fltk/advanced.html

Yes, as Manolo says, the crux is that the render context on WIN32 is basically single threaded and can only safely be accessed from the main thread of each process.

So to access rendering from a worker thread, you need to lock, or (better) use the FL::awake callback mechanism.

--
Ian
From my Fairphone FP3

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