set_global_engine_async

Description:

public async void set_global_engine_async (string global_engine, int timeout_msec, Cancellable? cancellable)

Set current global engine asynchronously.

this	An Bus.
global_engine	A new engine name.
timeout_msec	The timeout in milliseconds or -1 to use the default timeout.
cancellable	A Cancellable or `null`.
callback	A TaskReadyCallback to call when the request is satisfied or `null` if you don't care about the result of the method invocation.
user_data	The data to pass to callback.