How g_timeout_add works?

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Hi everybody.
I wonder if anyone know how the function 'g_timeout_add' works.
I wrote a little test like this:

/* test.cc */
#include <glib.h>
#include <iostream>

gboolean
callback (gpointer data) {
        cout << "called" << endl;
        return TRUE;
}

int
main() {
        g_timeout_add(1000, callback, NULL);
        while (1);
}

But it seemed that the function 'callback' had never been called.
Does anyone know why this happens?
Thanks in advance.

BTW: My system is a Redhat 6.1 box with glib-1.2.5.

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