Adds an event to the given connection.
This function is usually called by providers, to inform clients of events that happened during some operation.
As soon as a provider (or a client, it does not matter) calls this function with an event object which is an error, the
connection object emits the "error" signal, to which clients can connect to be informed of events.
WARNING: the reference to the event object is stolen by this function!
| this |
a Connection object. |
| event |
is stored internally, so you don't need to unref it. |