Will the GTK+ timeout callbacks be called in strict time order?

Question

When I add many different timeouts (with each intervall==0) in a thread, which is not the main thread (where gtk_main() resides)...

g_timeout_add(0, func, NULL);

... will then the different func() callbacks occur in the same order I called the corresponding g_timeout_add()'s?

The reason I'm asking is because GTK# is using internally timeouts to implement Application.Invoke() (see Application.cs and Timeout.cs).

EDIT: The concerning glib files are

• http://git.gnome.org/browse/glib/tree/glib/gmain.c
• http://git.gnome.org/browse/glib/tree/glib/ghook.c

Answer 1

Internally, g_timeout_add calls g_hook_insert_sorted. If g_timeout_add_full is used, the priority determines the ordering, otherwise the hook is added at the end of the list. Hooks are executed in order, so when only g_timeout_add is used, the answer is yes.

Unfortunately, there is not no explicit guarantee, and to me, it looks like an implementation detail which might change in the future.