Closes this
.
If the stream has not been canceled yet, adds a close-event to the event queue and discards any further incoming messages.
If the stream has already been canceled this method has no effect.
void close();
© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/2.0.0/dart-isolate/ReceivePort/close.html