'use strict'; const common = require('../common'); const cluster = require('cluster'); const net = require('net'); cluster.schedulingPolicy = cluster.SCHED_RR; if (cluster.isPrimary) { const worker = cluster.fork(); worker.on('exit', common.mustCall()); } else { const server = net.createServer(common.mustNotCall()); server.listen(0, common.mustCall(() => { process.channel.unref(); server.close(); })); }