function add_child_source(child_source: GLib.Source): void {
    // Gjs wrapper for g_source_add_child_source()

Adds child_source to source as a "polled" source; when source is added to a GLib.MainContext, child_source will be automatically added with the same priority, when child_source is triggered, it will cause source to dispatch (in addition to calling its own callback), and when source is destroyed, it will destroy child_source as well. (source will also still be dispatched if its own prepare/check functions indicate that it is ready.)

If you don't need child_source to do anything on its own when it triggers, you can call g_source_set_dummy_callback() on it to set a callback that does nothing (except return true if appropriate).

source will hold a reference on child_source while child_source is attached to it.

This API is only intended to be used by implementations of GLib.Source. Do not call this API on a GLib.Source that you did not create.

Since 2.28


a second GLib.Source that source should "poll"