dispose method

Implementation

@override
Future<void> dispose() async {
  if (_sendPort == null) return;

  // Cancel first so a stuck FFI call (e.g. infinite loop) unblocks before
  // we send the dispose command.  Without this, dispose() hangs forever
  // waiting for a port reply that the blocked isolate can never send.
  // See: https://github.com/runyaga/dart_monty/issues/113
  // coverage:ignore-start — exercised by integration tests (T2-2)
  await cancel();
  // coverage:ignore-end

  try {
    await _send<_DisposeResponse>(_DisposeRequest(_nextId++));
  } on MontyException {
    // Isolate may already be gone.
  } finally {
    _failAllPending('Isolate disposed');
    _receivePort?.close();
    _isolate?.kill(priority: Isolate.immediate);
    _isolate = null;
    _sendPort = null;
    _receivePort = null;
    _handleId = null;
  }
}