a string of the form "signal-name::detail".
The interface/instance type that introduced "signal-name".
Location to store the signal id. out
Location to store the detail quark. out
TRUE forces creation of a GQuark for the detail.
Whether the signal name could successfully be parsed and signal_id_p and detail_p contain valid return values.
Internal function to parse a signal name into its signal_id and detail quark.