a GType supporting GAsyncInitable.
the name of the first property, followed by the value, and other property value pairs, and ended by NULL.
The var args list generated from first_property_name.
the I/O priority of the operation.
optional GCancellable object, NULL to ignore.
a GAsyncReadyCallback to call when the initialization is finished
the data to pass to callback function
Helper function for constructing GAsyncInitable object. This is similar to g_object_new_valist() but also initializes the object asynchronously. When the initialization is finished, callback will be called. You can then call g_async_initable_new_finish() to get the new object and check for any errors. Since 2.22