[Vala] signal handling in gui thread

[Nor Jaidi Tuah <norjaidi tuah ubd edu bn>]

In gtkmm there is a class called Dispatcher that
works like the usual glib signal except that the
handler is executed in, typically, the gui thread.
This avoids a lot of ugly sync locks. I wonder if there
is something equivalent in vala.

hand
Nor Jaidi Tuah