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// Copyright (c) 2015, 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.
// VMOptions=--enable-asserts
import 'dart:async';
import 'dart:io';
import 'dart:isolate';
// This test attempts to check that the vm can shutdown cleanly when
// isolates are starting and stopping.
// We spawn a set of workers. Each worker will kill its parent
// worker (if any) and then spawn a child worker. We start these
// workers in a staggered fashion in an attempt to see a variety of
// isolate states at the time that this program terminates.
trySpawn(Function f, Object o) async {
try {
await Isolate.spawn<SendPort>(f, o);
} catch (e) {
// Isolate spawning may fail if the program is ending.
assert(e is IsolateSpawnException);
void worker(SendPort parentPort) {
var port = new RawReceivePort();
// This worker will exit when it receives any message.
port.handler = (_) {
// Send a message to terminate our parent isolate.
if (parentPort != null) {
// Spawn a child worker.
trySpawn(worker, port.sendPort);
void main() {
const numWorkers = 50;
const delay = const Duration(milliseconds: (1000 ~/ numWorkers));
const exitDelay = const Duration(seconds: 2);
// Take about a second to spin up our workers in a staggered
// fashion. We want to maximize the chance that they will be in a
// variety of states when the vm shuts down.
print('Starting ${numWorkers} workers...');
for (int i = 0; i < numWorkers; i++) {
trySpawn(worker, null);
// Let them spin for a bit before terminating the program.
print('Waiting for ${exitDelay} before exit...');