Re: trying to launch a dialog from outside the main gui thread by emiting a signal to the thread.

[Chris Vine <chris cvine freeserve co uk>]

On Tuesday 06 March 2007 17:45, Kevin Lambert wrote:
> I am currently working on a multithreaded application which has a primary
> GUI that is always running and I need to be able to get that GUI to show a
> popup to put images in.  The problem I am having is how do I tell the GUI
> to show the popup from outside of its own code?
>
> As a test I connected the "keys-changed" signal for the GUI's window so
> that if that signal gets emitted it launches my dialog.  I then added an
> external function which emits that signal which, when called, crashes the
> application with:
>
> Xlib: unexpected async reply (sequence 0x995)!
> Xlib: sequence lost (0x108c7 > 0xfd) in reply type 0x8!
> Xlib: sequence lost (0x10000 > 0xfd) in reply type 0x0!
>
> I do know that only the primary GUI thread is allowed to handle X calls
> which is why I had the signal handler launching my dialog.  I have tried
> googling for information but Im not finding much.

The callback is executed in the thread which emits the signal.  For your use 
(to cross thread boundaries), see g_idle_add().

Chris