nodejs/test/parallel/test-cluster-send-deadlock.js

// Copyright Joyent, Inc. and other Node contributors.
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'use strict';
// Testing mutual send of handles: from master to worker, and from worker to
// master.

require('../common');
const assert = require('assert');
const cluster = require('cluster');
const net = require('net');

if (cluster.isMaster) {
  const worker = cluster.fork();
  worker.on('exit', (code, signal) => {
    assert.strictEqual(code, 0, `Worker exited with an error code: ${code}`);
    assert(!signal, `Worker exited by a signal: ${signal}`);
    server.close();
  });

  const server = net.createServer((socket) => {
    worker.send('handle', socket);
  });

  server.listen(0, () => {
    worker.send({ message: 'listen', port: server.address().port });
  });
} else {
  process.on('message', (msg, handle) => {
    if (msg.message && msg.message === 'listen') {
      assert(msg.port);
      const client1 = net.connect({
        host: 'localhost',
        port: msg.port
      }, () => {
        const client2 = net.connect({
          host: 'localhost',
          port: msg.port
        }, () => {
          client1.on('close', onclose);
          client2.on('close', onclose);
          client1.end();
          client2.end();
        });
      });
      let waiting = 2;
      const onclose = () => {
        if (--waiting === 0)
          cluster.worker.disconnect();
      };
    } else {
      process.send('reply', handle);
    }
  });
}