Finds a source with the given source functions and user data. If multiple sources exist with the same source function and user data, the first one found will be returned.
the @source_funcs passed to g_source_new().
the user data from the callback.
the source, if one was found, otherwise %NULL
See Implementation
Finds a source with the given source functions and user data. If multiple sources exist with the same source function and user data, the first one found will be returned.