If you are using the version of Glib <=2.32 then apart from doing
gdk_threads_init you also need to do the following before doign
gdk_threads_init()
if (!g_thread_supported())
g_thread_init(NULL);
This will prevent deadlocks if GUI commands are passed from multiple
threads...
On Mon, Jan 14, 2013 at 9:21 AM, Phillip Susi <[email protected]> wrote:
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> I'm having some trouble with a multithreaded gtk app ( gparted ) that
> I'm hoping someone can help shed some light on. From what I have
> read, you have to call gdk_threads_init() before entering the main
> loop, and then call gdk_threads_enter() in the background thread
> before making gui calls, which I am ( and gdk_threads_leave() after ).
>
> Now sometimes I see a deadlock and when I inspect via gdb, it appears
> that the background thread is trying to show a dialog box which is
> trying to emit a signal which is trying to invoke a closure, which I
> think puts a message in the queue and waits for the main loop to
> process it. The main loop however, tries to acquire the gdk lock when
> it wakes up ( I think? ), and so it blocks because the background
> thread is holding it, and now you have deadlock.
>
> I also sometimes get an Xlib assertion failure that seems to be
> associated with gui calls in a non gui thread, but I am calling
> gdk_enter_threads() before making gui calls in the background thread.
> So what's the deal? What do you really have to do to have a
> background thread issue a pop up message box?
>
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