Language/12_Expressions/13_Spawning_an_Isolate_A01_t01.dart

/*
 * Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 * for details. All rights reserved. Use of this source code is governed by a
 * BSD-style license that can be found in the LICENSE file.
 */
/**
 * @assertion Spawning an isolate is accomplished via what is syntactically an
 * ordinary library call, invoking one of the functions spawnUri() or spawnFunction()
 * defined in the dart:isolate library.
 * However, such calls  have the  semantic effect of creating a new isolate with
 * its own memory and thread of control.
 * @description Checks that a new isolate created with spawnFunction()
 * has its own memory which is not shared with other isolates, using a top-level
 * variable to showcase it.
 * @author rodionov
 * @reviewer kaigorodov
 */
import 'dart:isolate';
import "../../Utils/async_utils.dart";
import "../../Utils/expect.dart";

var expectedMessage="message";

void iMain(SendPort replyPort) {
  replyPort.send(expectedMessage);
}

var receivePort = new ReceivePort();

void receiveHandler(var message) {
  Expect.equals(expectedMessage, message);
  receivePort.close();
  asyncEnd();
}

main() {
  asyncStart();
  Isolate.spawn(iMain, receivePort.sendPort);
  receivePort.listen(receiveHandler);
}