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Were you making use of the gtk.threads_enter() and gtk.threads_leave() calls to protect GTK calls outside of the main thread/signal handlers?

April 26, 2017Gtk main outside protect signal thread

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Were you making use of the gtk.threads_enter() and gtk.threads_leave() calls to protect GTK calls outside of the main thread/signal handlers?

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If not, that would explain the problems you ran into. GTK is not completely thread safe, so in some cases you need to acquire the GDK thread lock. Note that you can assume the GDK thread lock is acquired within signal handlers, but it isn’t within idle, timeout and IO handlers.