Re: Gtk+ and multithreating

[Chris Vine <chris cvine freeserve co uk>]

On Wed, 2007-05-16 at 16:44 +0200, Michelle Konzack wrote:
> Am 2007-05-14 22:22:34, schrieb Chris Vine:
> > Pass the callbacks representing the events concerned to the main program
> > loop using g_idle_add().  Make sure the callbacks return FALSE.
> > g_idle_add() is thread safe, provided that you have initialised glib
> > with g_thread_init().
> > 
> > Chris
> ------------------------- END OF REPLIED MESSAGE -------------------------
> 
> Forgive me if I do not understand this...
> Do you have a short exanple?
> 
> For the phtreads I have only copied an example-sniplet
> and modified a bit and it was just working...  :-)

The documentation is here:

http://developer.gnome.org/doc/API/2.0/glib/glib-The-Main-Event-Loop.html#g-idle-add

The idea is that you call g_idle_add() in your worker thread with a
callback (function pointer and data) which you want to execute in the
main program (GUI) loop.

A simple example would be to call:

g_idle_add((GSourceFunc)g_print, "Hello\n");

If you call this in the worker thread, it will print "Hello" in the GTK+
main program thread (you must have called g_thread_init(NULL) first).

It is the standard way of passing events to the GUI thread.

Incidentally, instead of using pthreads, you can use the platform
independent GThread implementation.  See:

http://developer.gnome.org/doc/API/2.0/glib/glib-Threads.html

Chris