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// Copyright (c) 2012, 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.
// @dart = 2.9
// Dart test program for testing that isolates can communicate to isolates
// other than the main isolate.
library CrossIsolateMessageTest;
import 'dart:isolate';
import 'package:async_helper/async_helper.dart';
import 'package:expect/expect.dart';
* Everything starts in the main-isolate (in the main-method).
* The main isolate spawns two isolates: isolate1 (with entry point
* 'crossIsolate1') and isolate2 (with entry point 'crossIsolate2').
* The main isolate creates two isolates, isolate1 and isolate2.
* The second isolate is created with a send-port being listened on by
* isolate1. A message is passed along this from isolate2 to isolate1.
* Isolate1 then sends the result back to the main isolate for final checking.
void crossIsolate1(SendPort mainIsolate) {
ReceivePort local = new ReceivePort();
mainIsolate.send(["ready1", local.sendPort]);
local.first.then((msg) {
// Message from crossIsolate2
Expect.equals(msg[0], "fromIsolate2");
mainIsolate.send(["fromIsolate1", msg[1] + 58]); // 100.
void crossIsolate2(SendPort toIsolate1) {
toIsolate1.send(["fromIsolate2", 42]);
void main([args, port]) {
ReceivePort fromIsolate1 = new ReceivePort();
Isolate.spawn(crossIsolate1, fromIsolate1.sendPort);
fromIsolate1.listen((msg) {
switch (msg[0]) {
case "ready1":
SendPort toIsolate1 = msg[1];
Isolate.spawn(crossIsolate2, toIsolate1);
case "fromIsolate1":
Expect.equals(msg[1], 100);
default:"unreachable! Tag: ${msg[0]}");
}, onDone: asyncEnd);