node/test/parallel/test-worker-message-port-te...

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'use strict';
const common = require('../common');
const { parentPort, MessageChannel, Worker } = require('worker_threads');
// Do not use isMainThread so that this test itself can be run inside a Worker.
if (!process.env.HAS_STARTED_WORKER) {
process.env.HAS_STARTED_WORKER = 1;
const w = new Worker(__filename);
w.once('message', common.mustCall(() => {
w.once('message', common.mustNotCall());
setTimeout(() => w.terminate(), 100);
}));
} else {
const { port1 } = new MessageChannel();
parentPort.postMessage('ready');
// Make sure we dont end up running JS after the infinite loop is broken.
port1.postMessage({}, {
transfer: (function*() { while (true); })()
});
parentPort.postMessage('UNREACHABLE');
process.kill(process.pid, 'SIGINT');
}