[Vala] How to pass a gtk widget to a thread?

[Nadav Vinik <nadavvin gmail com>]

Hello

I change the constructor of the following example:
https://live.gnome.org/Vala/ThreadingSamples

to get a gtk widget instead of string, but while it compile successfully,
if I use the widget inside the thread, it failed to compile and I have the
following error:
"/home/nadav3/gtk-foobar2/src/pcap-thread.c:241:4: error: cannot convert to
a pointer type"

public MyThread (ListStore l) {        this.l = l;    }

public void* thread_func () {
                l.append (out iter);
                l.set(iter, 0, "test");
}

var t=new MyThread(l);
unowned Thread<void*> a = Thread.create<void*> (t.thread_func, true);

thanks
Nadav

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