G_Signals handling non-Gobject types? - c

Question

The only example I was able to find for creating and emitting new signals was on the gnome developer site which provides the following example:
file = g_object_new (MAMAN_FILE_TYPE, NULL);
g_signal_connect (file, "changed", G_CALLBACK (changed_event), NULL);
maman_file_write (file, buffer, strlen (buffer));
/* ------------------ */
file_signals[CHANGED] =
g_signal_newv ("changed",
G_TYPE_FROM_CLASS (gobject_class),
G_SIGNAL_RUN_LAST | G_SIGNAL_NO_RECURSE | G_SIGNAL_NO_HOOKS,
NULL /* closure */,
NULL /* accumulator */,
NULL /* accumulator data */,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE /* return_type */,
0 /* n_params */,
NULL /* param_types */);
/* ------------------ */
void maman_file_write (MamanFile *self, const guchar *buffer, gssize size)
{
/* First write data. */
/* Then, notify user of data written. */
g_signal_emit (self, file_signals[CHANGED], 0 /* details */);
}
One thing I'm wondering is whether it's possible to emit signals which don't have a GObject as a source -- and whether it's possible to pass non-Gobject structures.
For simplicity sake suppose I have a function that creates point objects and I want to emit a signal when a point has been created (suppose there is some GtkWidget that displays something when a point is created):
struct point {
int x,y;
};
struct point *new_point(int x, int y) {
struct point *my_point = malloc(sizeof(point));
my_point->x= x;
my_point->y= y;
/* ???
g_signal_emit "point-created"
send pointer to my_point as a parameter to listeners
*/
return my_point;
}
Is there a way to make something akin to the lower work without all of the boiler plate that goes into creating a new G_OBJECT_TYPE ?