qio: store gsources for net listeners

Originally we were storing the GSources tag IDs.  That'll be not enough
if we are going to support non-default gcontext for QIO code.  Switch to
GSources without changing anything real.  Now we still always pass in
NULL, which means the default gcontext.

Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

include/io/net-listener.h

@@ -53,7 +53,7 @@ struct QIONetListener {
 
     char *name;
     QIOChannelSocket **sioc;
-    gulong *io_tag;
+    GSource **io_source;
     size_t nsioc;
 
     bool connected;
@@ -119,6 +119,26 @@ int qio_net_listener_open_sync(QIONetListener *listener,
 void qio_net_listener_add(QIONetListener *listener,
                           QIOChannelSocket *sioc);
 
+/**
+ * qio_net_listener_set_client_func_full:
+ * @listener: the network listener object
+ * @func: the callback function
+ * @data: opaque data to pass to @func
+ * @notify: callback to free @data
+ * @context: the context that the sources will be bound to.  If %NULL,
+ *           the default context will be used.
+ *
+ * Register @func to be invoked whenever a new client
+ * connects to the listener. @func will be invoked
+ * passing in the QIOChannelSocket instance for the
+ * client.
+ */
+void qio_net_listener_set_client_func_full(QIONetListener *listener,
+                                           QIONetListenerClientFunc func,
+                                           gpointer data,
+                                           GDestroyNotify notify,
+                                           GMainContext *context);
+
 /**
  * qio_net_listener_set_client_func:
  * @listener: the network listener object
@@ -126,10 +146,8 @@ void qio_net_listener_add(QIONetListener *listener,
  * @data: opaque data to pass to @func
  * @notify: callback to free @data
  *
- * Register @func to be invoked whenever a new client
- * connects to the listener. @func will be invoked
- * passing in the QIOChannelSocket instance for the
- * client.
+ * Wrapper of qio_net_listener_set_client_func_full(), only that the
+ * sources will always be bound to default main context.
  */
 void qio_net_listener_set_client_func(QIONetListener *listener,
                                       QIONetListenerClientFunc func,