The last few weeks we have seen an extremely verbose thread of
conversation on gtkmm-list (How to update both the Console and the GTKMM
gui window after running other functions). I have not read all the
countless posts in that thread of conversation, but it made me aware
that the gtkmm tutorial contains a chapter on multi-threaded programs,
https://developer.gnome.org/gtkmm-tutorial/stable/chapter-multi-threaded-programs.html.en,
but no example program. Now I have added an example program at
https://git.gnome.org/browse/gtkmm-documentation/tree/examples/book/multithread.
I also added a short explanation in the tutorial. Since it may take some
time before that explanation will be easily available on the web, I show
it here:
This is an example program with two threads, one GUI thread, like in
all gtkmm programs, and one worker thread.
The worker thread is created when you press the Start work button.
It is deleted when the work is finished,
when you press the Stop work button, or when you press the Quit button.
A Glib::Dispatcher is used for sending notifications from the worker
thread to the GUI thread.
The ExampleWorker class contains data which is accessed by both
threads. This data is protected
by a Glib::Threads::Mutex. Only the GUI thread updates the GUI.
If you find bugs in the example program, I'd like to know. I have
strived to make it thread-safe.
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